BIOLOGY LIBRARY UCB BIOLOGY LIBRARY UCB SUBSCRIBERS' EDITION SPEC I ALLY PREPARED FOR WILLIAM PATT1SON. THE NATURAL HISTORY OF ANIMALS (CLASS MAMMALIA-ANIMALS WHICH SUCKLE THEIR YOUNG), IN WORD AND PICTURE. BY CARL VOGT, — AND FRIEDRICH SPECHT, PROFESSOR OF NATURAL HISTORY IN THE UNIVERSITY OF GENEVA. OF STUTTGART, THE DISTINGUISHED DELINEATOR OF ANIMAL LIFE. TRANSLATED AND EDITED WITH ADDITIONS BY GEO. G. CHISHOLM, M.A., B.SC., F.R.G.S., AUTHOR OP "THE WORLD AS IT is;" TRANSLATOR OF "SWITZERLAND; ITS SCENERY AND ITS PEOPLE " ETC. ILLUSTRATED BY ABOVE THREE HUNDRED FINE ENGRAVINGS ON WOOD. THE SCOPE OF THE WORK. — The present Work is devoted to the natural history of the animals that suckle their young, and in the ac- count of them here given the pen of an eminent naturalist co-operates with the pencil of an equally eminent delineator of animal life to produce a view of the subject more satisfactory than what will be found in any previous publication. In this treatise the reader will find — along with admirable pictorial illustrations — a description of all the principal species, from such ponderous creatures as the elephant, the whale, and the hip- popotamus, to the tiny mouse; from the bat that wings its way through the air, to the mole that burrows through the earth; from the apes and monkeys that have their four limbs furnished with hands, to the seal and walrus that have theirs in the shape of paddles, or the dolphin and por- poise that have no hind limbs at all; from the lion, tiger, wolf, and all their savage tribe, to the timid sheep and rabbit; from the many Mammals that bring forth their young differing but little in appearance from their parents, to the kangaroo that carries its immature young ones in a pouch, and the duckmole and echidna that hatch their young from eggs — all being portrayed in the most vivid manner, and their habits, appearance, and place in nature being set forth in sufficient detail. THE INTEREST OF THE SUBJECT.— As to the inherent attractiveness of the subject thus dealt with little need be said, more especially in these days, when all branches of natural history are studied with the keenest enthusiasm ; still, we may remark, that as the Mammalia comprise all those animals that are most useful to, and most closely associated with man, the department of Zoology here treated is, for readers in general, one that is invested with features of interest beyond all others. THE AUTHOR AND THE TEXT. — The name of the distinguished naturalist Carl Vogt, who has long been recognized as one of the leaders of scientific thought and one of the masters of scientific exposition on the continent of Europe, is sufficient to stamp the work as one of high character, more especially when we know that it is a product of its author's mature years and extended studies. These studies have ranged over almost the entire field of natural science, and have embraced every department that is likely to shed light on the subject which he here discusses. Moreover, the author has not been a mere student of books and of museum specimens, but has him- self visited the haunts of many of those animals which he describes, and consequently much of his information regarding their homes and their habits is given from personal observation. As a writer he has long been one of that brilliant band, so emi- nently characteristic of the present day, who seek to bring science to the knowledge of all, recognizing that it becomes most fruitful of good when it is most widely disseminated among the people. THE POPULAR CHARACTER OF THE WORK.— The present account of the animals comprised in the class Mammalia will be found accordingly to possess a decidedly popular character, not popular, however, through lack of scientific value, but because the author presents the facts in an attractive form, and studies to smooth the path of those who can give only their leisure hours to learning the results of scientific research. The author's style is above all things clear, simple, and direct, and where occasion offers, lively and animated. The descrip- tions of the animals, though necessarily concise, are always adequate and interesting, and the matter of a more strictly scientific kind is adapted with great skill to the needs of those who have had no scientific training. The fact that this work has already appeared in a French and an Italian version, as well as in the original German, attests its popular character and the high esteem in which it is held. This, the only English version, has been prepared by a writer who has already manifested his ability as a translator and author. ITS SCIENTIFIC VALUE. — As a description of the Mammalia — animals which suckle their young- written in the light of the most recent research, the work is of the highest value from a scientific point of view. While carefully refraining from burdening the text with details, the author selects from the stores of his knowledge those facts which are most significant and best suited to throw light on every topic that successively falls to be treated of. The methods of research and comparison followed by men of science are clearly and concisely brought out; and one who has really studied these volumes will have gained a scientific training of genuine value, besides having acquired a just idea of the place in nature of the Mammals as a class, and of the various orders and families of which, that class is made up. The geographical distribution of the various animals receives due attention, and the relations of living species to others now only known from fossil remains are frequently adduced. THE TRANSLATOR'S ADDITIONS. — A number of additions, clearly distinguished from the author's text, have been made by the translator, consisting of graphic and interesting extracts from the works of some of the most observant travellers and others who have written on natural history. They have been selected with the view of imparting greater completeness to the mental picture which the reader may form of the animals described. In them adventures of travellers and sportsmen, and entertaining anecdotes, serve to exhibit a few of the best-known mammals in situations in which their native character is brought into relief. THE ARTIST AND THE ILLUSTRATIONS. — The Illustrations (above 300 in number) are from the pencil of Friedrich Specht, the most eminent natural history painter at the present day. His success in the delineation of animal life arises not merely from long study and skill as an artist, but also from the fact that he is by education a naturalist. This qualification ensures two things which are so frequently wanting in the works of animal painters who are not naturalists. It enables us to rely on the accuracy of character and detail, so essential to scientific truth in pictorial representations of members of the animal kingdom ; and it is a voucher for the fidelity with which the action and behaviour of the animals have been depicted— amidst surroundings appropriate to them in their free life — in the woods and forests, on mountains or plains, on land or in water. The artist has portrayed — and that in the most spirited manner —the animals as they appear in the varied cir- cumstances of real life, in quest of their prey, caressing their young ones, or sporting with their fellows. The engravings have been executed in the most careful and finished manner, under Mr. Specht's own direction. INDEX AND GLOSSARY. — A copious Index will be furnished, by the use of which the details re- garding any animal may be ascertained by referring either to its scientific or its vernacular name. A pictorially illustrated Glossary will likewise be sup- plied, explaining the scientific words employed, though most of these are briefly defined in the text, and that generally the first time they are used. CONDITIONS. — The book will be printed in the finest manner, on highly finished paper, made expressly for it, and will form two handsome quarto volumes. It will be illustrated by forty full-page separate engravings, and two hundred and sixty-four printed in the text. The Work will he issued in two handsome volumes, cloth extra, gilt edges, 48^.; and also in full morocco, gilt extra, 5 guineas. BLACKIE & SON, LIMITED; LONDON, GLASGOW, EDINBURGH, AND DUBLIN. J'UJU. !SJll-\ (, EXCLUSIVELY 1', Y .s r/.'.VCVi'/y Tl (>.\. THE NATURAL HISTORY OF ANIMALS [CLASS MAMMALIA]. ESKIMO !)()(. • : in.j'iaris borealis.) Frontis. i' THE NATURAL HISTORY OF ANIMALS (CLASS MAMMALIA— ANIMALS WHICH SUCKLE THEIR YOUNG), IN WORD AND PICTURE. BY CARL VOGT, AND FRIEDRICH SPECHT, PROFESSOR OF NATURAL HISTORY IN THE UNIVERSITY OF GENEVA, OF STUTTGART, TUB DISTINGUISHED DELINEATOR OF ANIMAL LIFE. TRANSLATED AND EDITED WITH ADDITIONS BY GEORGE G. CHISHOLM, M.A., B.SC., F.R.G.S. AUTHOR OF "THE WORLD AS IT is;"' TRANSLATOR OF "SWITZERLAND: ITS SCENERY AND ITS PEOPLE;" ETC. VOL. I. LONDON: BLACKIE & SON, LIMITED, 49 & 50 OLD BAILEY, E.G. GLASGOW AND EDINBURGH. BIOLOGY LIBRARY G P R E F A C E. The work here submitted to the English public is a translation of one that has already appeared in three languages, German, French, and Italian. The intrinsic interest of the subject, the character of the text, which is from the pen of a distinguished naturalist long recognized as a master in scientific ex- position, and the character of the illustrations, which are the work of the most eminent natural -history painter now living, quite ac- count for its having earned this distinction, and will no doubt make the work welcome in an English dress. With regard to the English edition a few words of explanation are necessary. While the English text is in the main a transla- tion from the German, it is the duty of the translator to explain a few differences that will be found between it and the original from which the translation was made. In the first place it ought to be stated that the French, as well as the Italian version, is from the hand of the author himself, and both of these are hence entitled to be re- garded as original works. Occasionally, therefore, the translator, while following the German as a rule, has felt himself at liberty to adopt modifications introduced by the author into the French version. VOL. I. Another difference will be found in the naming of the animals described. While, as in duty bound, the translator has always given the scientific names used by the author himself, he has in many cases added other scientific names which are more commonly applied to the same animals by English naturalists, and by which accordingly the animals spoken of are likely to be more easily identified by English readers. These additional names are distinguished by being inclosed in subordinate parentheses after the names used by the author. Where a different name is added only for the genus or the species, that name is given after the generic or specific name used by Vogt. For example, " Rhyzcena (Suricata) tetradactyla" means that the animal referred to by Vogt as Rhyzcena tetradactyla is the Suricata tetradactyla of other naturalists, and " Ursusferox (korribilis)" means that the animal called Ursus ferox by Vogt is the same as that known to others as Ursus horribilis. Where both generic and specific names are different the entire alterna- tive name of the animal is given after that used by the author, thus "Lefitonyx monachus (Mon- achus albiventer}" means that the Leptonyx monachus of Vogt is the Monachus albiventcr of other writers. In furnishing an alternative i VI PREFACE. scientific name the translator has chiefly had in view the practical aim of enabling readers to identify the animal described with animals exhibited in the gardens of the Zoological Society of London; and accordingly, where an animal is to be found in the catalogue printed for the Society under the title of " List of the Vertebrated Animals now or lately living in the Gardens of the Zoological Society of London" (eighth edition, 1883), he has added the scientific name used in that list, except where the animal can easily be found in it by means of the popular name. In other cases the names used in well-known English works have been added; and ad- ditional vernacular names have sometimes been given from Sterndale's " Mammals of India and Ceylon," Gould's "Mammals of Australia," Elliott Coues' " Report upon the Collections of the Mammals of the United States," and other works. The account of the recent observations on the development of the Monotremes, made since the writing of the German and French versions of the work, has been translated from manuscript corrections kindly furnished by the author. A more serious divergence from the ori- ginal will be found in the Introduction, in which a few paragraphs have been inter- polated by the translator, for the purpose of making the context more easily understood by readers who may be wholly unacquainted with natural history. In making these addi- tions, however, the translator has carefully adhered to the sense of the writer of the original work. The translator is likewise responsible for the compilation of the Glossary, and for the selection of the extracts from the works of travellers and naturalists, containing narra- tives of adventure and additional particulars relating to the habits of the animals described. These insertions are distinguished from the other matter by being inclosed in brackets and printed in smaller type. GEO. G. CHISHOLM. THE PICTURES. FULL-PAGE PICTURES. PLATE To face page I. THE CHIMPANZEE (Troglodytes nigcr), 32 II. THE GORILLA (Troglodytes gorilla), 34 III. THE ORANG-UTANG OR MIAS (Simla satyrus), . 36 IV. GREEN GUENONS (Cercopithecus sabasus) plundering a Maize-field, 48 V. GROUP OF JAVA MONKEYS (Macacus cynomolgus), . 50 VI. WOLVES (Canis lupus) in pursuit of Prey, . . 136 VII. STRIPED HYAENAS (Hyaena striata) AND JACKALS (Canis aureus), 154 VIII. THE BARBARY LION (Felis leo); - . 162 IX. THE SENEGAL LION (Felis leo), 164 X. THE LEOPARD (Felis leopardus), 168 XI. THE JAGUAR (Felis onca) „ 176 XII. THE POLAR BEAR (Ursus maritimus), 204 XIII. THE COMMON OR BROWN BEAR (Ursus arctos), 206 XIV. A WOLVERENE OR GLUTTON (Gulo borealis) attacking a Reindeer, 218 XV. THE WALRUS OR MORSE (Trichechus rosmarus), 252 PICTURES IN THE TEXT. 1. The Hoolock (Hylobates leuciscus), 2. The White-handed Gibbon (Hylobates lar), . 3. Entellus Monkeys (Semnopithecus entellus), 4. The Proboscis Monkey 01 Kahau (Semnopithecus nasica), 5. The Guereza (Colobus guereza), .... 6. The Diana Monkey (Cercopithecus diana), . 7. Group of Rhesus Monkeys (Macacus rhesus), 8. The Wanderoo (Macacus silenus), .... 9. The Barbary Ape (Inuus ecaudatus), 10. The Black Ape (Cynocephalus niger), . 1 1. The Gelada (Cynocephalus gelada), 12. The Common Baboon (Cynocephalus Babuin), 13. The Mandrill (Cynocephalus Maimon), . 14. Red Howling Monkeys (Mycetes seniculus), . 15. The Barrigudo (Lagothrix Humboldti), . 16. The Miriki Spider-monkey (Ateles eriodes), . 17. The Weeper Capuchin or Sai (Cebus capucinus), . 1 8. The Couxio or Black Saki (Pithecia Satanas), 19. The Ouakari (Brachyurus calvus), .... 20. The Masked Callithrix (Callithrix personata), 21. Saimiri or Squirrel-monkey (Chrysothrix sciurea), . PAGE FIG. 41 22. 43 45 23. 24. 46 25. 47 26. 49 27. 5° 28. 5' 52 29. 55 30- 56 31- 58 32. 59 33- 63 34. 64 65 35- 66 36. 67 37- 68 38. 68 39- 69 The Mirikina or Three-banded Douroucouli (Nyc- tipithecus trivirgatus), 70 The Silky Marmoset (Hapale rosalia), . . .71 The Ouistiti or Marmoset (Hapale Jacchus), . . 72 Ring-tailed Lemur (Lemur catta), . . . .81 The Dwarf Lemur (Microcebus myoxinus), . . 81 The Gray Lemur (Hapalemur griscus), ... 82 The Waluvi or Forked -crowned Mouse Lemur (Chirogaleus furcifer), 83 The Indris or Babakoto (Lichanotus Indris), . . 84 The Aye-aye (Chiromys madagascariensis), . . 85 The Potto (Pterodicticus Potto), .... 87 The Angwantibo (Arctocebus calabarensis), . . 88 The Common Galago (Otolicnus Galago), . • 89 The Slow-paced Lemur or Slender Loris (Stenops gracilis), 90 The Spectre-tarsier (Tarsius spectrum), . . -91 The Colugo or Flying-cat (Galeopithecus volitans), 93 The Kalong (Pteropus edulis), .... 102 The Long-eared Bat (Plecotus auritus), . . . 104 The Barbastelle or Pug-nose Bat (Synotus barbas- tellus), 104 viii THE PICTURES. ric. 40. The Water-bat (Vespertilio Daubentoni), 41. The Noctule (Vesperugo noctula), .... 42. The Pipistrelle or Dwarf Bat (Vesperugo pipis- trellus), 43. The Flap-nosed Bat (Rhinopoma microphyllum), . 44. The Vampire Bat (Phyllostoma spectrum), 45. The Greater Horse-shoe Bat (Rhinolophus ferrum- equinum), 46. The Banxring or Tana (Cladobates Tana), 47. The Elephant-shrew (Macroscelides typicus), 48. The Wuychuchol (Myogale moschata), . 49. The Garden-shrew (Crocidura aranea), . 50. The Water-shrew (Crossopus fodiens), , 51. The Agouta or Almiqui (Solenodon paradoxum), . 52. The Tanrec (Centetes ecaudatus), .... 53. A Family of Hedgehogs (Erinaceus europaeus), 54. The Common Mole (Talpa europaea), 55. The Star-nosed Mole (Condylura cristata), 56. The Cape Golden Mole (Chrysochloris capensis), . 57. The African Wolf (Canis lupaster), 58. The Maned Wolf (Canis jubatus), .... 59. The Coyote or Prairie-wolf (Canis latrans), 60. The Slender Jackal (Canis anthus), 61. The Dingo (Canis dingo), 62. The Black -backed Jackal (Canis mesomelas), 63. The Aguarachay (Canis Azaras), .... 64. The Fox (Canis vulpes), 65. The Corsac (Canis corsac) 66. The White or Arctic Fox (Canis lagopus), 67. The Sahara Fox or Fennek (Canis zerda), 68. Viverra Dog or Tanuki (Nyctercutes viverrinus), . 69. The Long-eared Fox (Otocyon caffer), . 70. The Cape Hunting-dog (Lycaon pictus), 71. The Spotted Hyaena (Hyasna crocuta), 72. The Earth-wolf or Aardwolf (Proteles Lalandii), 73. Fahhad or Maneless Hunting-leopard (Cynailurus guttatus), 74. The Tiger (Felis tigris), 75. The Clouded Tiger (Felis macroscelis), . 76. The Marbled Cat (Felis marmorata), 77. The Gloved or Fallow Cat (Felis maniculata), 78. The Wild Cat (Felis catus), 79. The Viverrine Cat (Felis viverrina), 80. The Serval (Felis Serval) 8 1. The Puma or Cougar (Felis concolor), . 82. The Ocelot (Felis pardalis), 83. The Pampas Cat (Felis pajeros), .... 84. The Eyra (Felis eyra) 180 PAGE FIG. 105 85. 106 86. 87. 107 88. 1 08 89. 109 90. 91. no 92. "5 93- H5 94- 116 95- 118 "9 96. 120 121 97- I23 98. 124 99- 125 IOO. 126 IOI. •38 102. 139 I03. I4O IO4. 141 105. 143 1 06. '45 107. 146 108. 147 109. 148 I 10. 149 III. 150 112. IS' I'3- 152 114. 'S3 "5- 156 116. 157 "7- 118. 161 119. 167 1 20. 169 121. 171 122. 172 123- 173 124. 174 125. 175 126. '77 127. 178 128. '79 I29. 1 80 '3°- The Caracal (Lynx Caracal), . . . . . 182 The Polar Lynx (Lynx vulgaris), .... 183 The Spanish Lynx (Lynx pardinus), . . . 184 The Fossa (Cryptoprocta ferox), . . . .185 The Common Genet (Genetta vulgaris), . .187 The African Civet-cat (Viverra Civetta), . .188 The Asiatic or Indian Civet (Viverra Zibetha), . 189 The Delundung or Linsang (Prionodon gracilis), . 190 The Paradoxure or Palm-cat (Paradoxurus typus), 191 The Mampalon (Cynogale Bennettii), . . .192 The Egyptian Ichneumon or Pharaoh's Rat (Her- pestes Ichneumon), 193' The Mongoose or Gray Ichneumon (Herpestes griseus), 194 The Suricate (Rhyzasna tetradactyla), . . . 195 The Cacamizli (Bassaris astuta), . . . .198 The Common Raccoon (Procyon lotor), . -199 The Social Coati (Nasua socialis), . . . 200 The Kinkajou (Cercoleptes caudivolvulus), . . 201 The Binturong (Arctictis binturong), . . . 202 The Panda (Ailurus fulgens), .... 203 Ailuropus melanoleucus, 204 The Black Bear (Ursus americanus), . . . 208 The Malayan Bear (Ursus malayanus), . . 209 The Indian Black Bear (Ursus labiatus), . . 210 The Common Badger (Meles taxus), . . . 214 The Telagon (Mydaus Telagon), . . . -215 The Cape Ratel (Ratelus capensis), . . . 216 The Brazilian Skunk (Mephitis suffocans), . . 217 The Bush-dog (Icticyon venaticus), . . .219 The Tayra (Galictis barbara), .... 220 The Pine-Marten (Mustela martes), . . .221 The Beech-Marten (Mustela foina), . . . 222 The Sable (Mustela zobellina), .... 223 The Polecat (Putorius tetidus), .... 224 The Ferret (Putorius furo), 225 The Common Stoat (Putorius erminea), . . 226 The Weasel (Putorius vulgaris), .... 227 The European Vison (Putorius lutrcola), . . 228 The Lynx-tooth (Lyncodon patagonicus), . . 229 The Otter (Lutra vulgaris), 231 The Sea-otter (Enhydris marina), .... 232 Steller's Sea-lion (Otaria Stelleri), . . . .243 The Sea-bear (Otaria ursina), .... 245 The Sea-elephant (Cystophora proboscidea), . 247 The Bladder-nosed Seal (Cystophora cristata), . 248 The Sea-leopard (Leptonyx leopardinus), . . 249 The Greenland Seal (Phoca grcenlandica), . . 250 THE CONTENTS. INTRODUCTION. General Characters of the Vertebrata, .... Different Types of the Vertebrata, .... Comparison of Vertebrate Types, Position of the Mammalia in the Sub-kingdom Verte- brata, The Mammalian Structure, General Characters, ....... Special Characters : The Skin and its Modifications, Hair, Nails, Super- ficial Glands, Milk Glands, .... The Skeleton: Skull, Limbs, Shoulder-girdle, Fore- and Hind-limbs, the Hand; Position of the Limbs in Walking, The Teeth: their Structure, Milk and Permanent Teeth, Dental Formulas, Perfecting of the Dental Systems during the Evolution of the Ancestry of the present Mammals, . Reproduction in the Mammalia, Distribution in Space of the Mammalia, Subdivision of the Mammals based on the presumed order of Evolution, Presumable Relations of existing Placental Orders to a Marsupial Ancestry as shown by the Dental Characters, . . PACE I I 2 2 2 2 6 ii 12 14 16 Table of the Orders, Families, and Tribes of the Mammalia, 18 Note on Geological Points referred to in this Work, . 22 Geological Table of the Main Rock-systems into which the Crust of the Earth is divided, .... 23 APES AND MONKEYS (SIMI/E). Introduction, Monkeys of the Old World (Catarrhinae), ANTHROPOID APES (Anthropomorphas), . Black Anthropoid Apes (Troglodytes), . Chimpanzee (Troglodytes niger), Chego (Troglodytes Tchego), Gorilla (Troglodytes gorilla), Red Anthropoid Apes (Sitnia), Orang-utang or Mias (Simia satyrus), 25 32 32 32 33 35 35 36 36 Gibbons (Hylobates), 39 Siamang (Hylobates syndactylus), ... 40 Hoolock (Hylobates leuciscus (hoolock)), . . 41 White-handed Gibbon (Hylobates lar), . . 42 TAILED MONKEYS (Caudatas), 42 Semnopitheci, ........ 46 Entellus Monkey or Hunuman (Semnopithecus entellus), 46 Proboscis Monkey or Kahau (Semnopithecus nasica), 47 Colobi, 48 Guereza (Colobus guereza), 48 The Guenons (Cercopithecus), 48 Talapoin (Myiopithecus talapoin), ... 48 Diana Monkey (Cercopithecus diana), . . 48 Mona (Cercopithecus mona), .... 48 Mangabey or Moorish Monkey, .... 48 Hussar or Nisnas Monkey (Cercopithecus pyr- rhonotus), 48 Green Guenon (Cercopithecus sabaeus), . . 49 Macaques (Macacus), ...... 49 Java Monkey (Macacus cynomolgus), . . 51 Boonder (Macacus rhesus), . . . -5' Wanderoo (Macacus silenus), . . . 51 Magot (Inuus ecaudatus), 52 Baboons (Cynocephalus), . . . . -53 Black Ape (Cynocephalus niger), • • • S5 Gelada (Cynocephalus gelada), .... 55 Arabian Baboon (Cynocephalus hamadryas), . 55 Common Baboon (Cynocephalus Babuin), . . 57 Chacma or Pig-faced Baboon (Cynocephalus porcarius), 57 Guinea Baboon (Cynocephalus sphinx), . . 57 Mandrill (Cynocephalus Maimon), ... 59 Drill (Cynocephalus leucophaeus), ... 59 Monkeys of the New World (Platyrrhinoe), ... 60 NAKED-TAILED MONKEYS (Gymnurae), ... 62 The Howlers (Mycetes), 62 Red Howling Monkey (Mycetes seniculus), . 63 The Woolly Monkeys (Lagothrix), .... 64 Barrigudo (Lagothrix Humboldti), ... 64 The Spider-monkeys (Ateles), .... 64 Miriki (Ateles criodes), 64 THE CONTENTS. THE SAJOUS (Cebidae), 65 Weeper Capuchin (Cebus capucinus), . . 66 THE SAKIS (Aneturse), 66 Couxio or Black Saki (Pithecia Satanas), . . 67 Ouakari (Brachyurus calvus), .... 67 Masked Callithrix (Callithrix personata), . . 68 Saimiri or Squirrel-monkey (Chrysothrix sciurea), 69 Mirikina (Nyctipithecus trivirgatus), ... 70 Clawed Monkeys (Arctopitheci), 7° Silky Marmoset (Hapale rosalia), ... 72 Ouistiti or Common Marmoset (Hapale Jacchus), 73 Geographical Distribution and Descent of the Apes and Monkeys, 73 THE PROSIMIANS (PROSIMII). Introduction, 77 THE PROSIMIANS OF MADAGASCAR, The Lemurs (Lemurida), Ring-tailed Lemur (Lemur catta), Dwarf Lemur (Microcebus myoxinus), Gray or Broad-nosed Lemur (Hapalemurgriseus), Waluvi (Chirogaleus furcifer), .... The Indris Family (Indrisida), .... Indris or Babakoto (Lichanotus Indris), . The Aye-aye, Aye-aye (Chiromys madagascariensis), THE AFRICAN PROSIMIANS, The Potto Family (Pterodictidd), The Potto (Pterodicticus Potto), .... Angwantibo (Arctocebus calabarensis), The Galagos (Galagonida), Grand or Thick-tailed Galago (Otolicnus crassi- caudatus), Komba (Otolicnus agisymbanus), Galago proper (Otolicnus Galago), THE EAST INDIAN PROSIMIANS, .... The Lori's (Lorisida), Plump Loris (Stenops tardigradus), . Slow-paced Lemur (Stenops gracilis), The Spectre-tarsier ( Tarsias spectruni), The Colugos (Galeopithecida), .... Colugo or Flying-cat (Galeopithecus volitans), . Geographical Distribution and Descent of the Pro- simians, THE BATS (CHIROPTERA). Introduction FRUIT-EATING BATS (Carpophaga), . Flying-foxes (Pteropida), . . . . Kalong (Pteropus edulis), . INSECT-EATING BATS (Entomophaga), . True Bats or Vespertilionida (Gymnorhina), Long-eared Bat (Plccotus auritus), 80 80 83 83 83 84 84 85 86 86 87 87 87 87 89 89 89 89 90 9° 92 93 94 94 96 101 101 1 02 103 103 104 Barbastelle or Pug-nose Bat (Synotus barbas- tellus), 105 Common Mouse-coloured Bat (Vespertilio mur- inus), 105 Water-bat (Vespertilio Daubentoni ), . . . 105 Noctule (Vesperugo noctula), .... 106 Pipistrelle or Dwarf Bat (Vesperugo pipistrellus), 106 Leaf -nosed Bats (Pity lias to mat a), . . . .107 Flap-nosed Bat (Rhinopoma microphyllum), . 107 True Vampire (Phyllostoma spectruni), . . 108 Horse-shoe Bats of the Old World, . . . 109 Lesser Horse-shoe Bat (Rhinolophus hippo- sidcros), . 1 10 Greater Horse-shoe Bat (Rhinolophus ferrum- equinum), ' . .no Geographical Distribution and Descent of the Bats, . no THE INSECT-EATERS (INSECTIVORA). Introduction, 112 BANXRINGS OR CLIMBERS (Tupaias), . . .114 Tana or Banxring (Cladobates Tana), . .114 THE JUMPING-SHREWS (Macroscelida), . . .115 Elephant-shrew (Macroscelides typicus), . .116 Algerian Jumping-shrew (Macroscelides Rozeti), 116 THE DESMANS OR DIVERS (Myogalida), . .116 Wuychuchol (Myogale moschata), . . .116 Desman (Myogale pyrenaica), . . . .116 THE SHREWS OR RUNNERS (Soricida), . . .117 Garden-shrew (Crocidura aranea), . . .118 Water-shrew (Crossopus fodiens), . . .118 Agouta or Almiqui (Solenodon paradoxum), . 120 THE CRAWLERS, 120 The Tanrecs (Centetida), 1 20 Tanrec (Centetes ecaudatus), . . . .121 Gymnura Raffles!! , 121 The Hedgehogs (Erinacei), 121 Hedgehog (Erinaceus europxus), . . . 122 THE BORROWERS, 122 The Moles (Talpida), 123 Common Mole (Talpa europzca), . . .123 Star-nosed Mole (Condylura cristata), . .125 Scalops canadensis, 125 Group of the Golden Moles (Chrysochlorida), . 125 Geographical Distribution and Descent of the Insect- eaters, 126 THE FLESH-EATERS (CARNIVORA). Introduction, The Dog Tribe (Canida) THE DOGS PROPER (Canis), . Group of the Wolves (sub-genus Lupus), Common Wolf (Canis lupus), African Wolf (Canis lupaster), . 129 134 '37 137 137 '39 THE CONTENTS. XI Maned Wolf (Canis jubatus), .... Coyote or Prairie-wolf (Canis latrans), Jackal or Dib (Canis aureus), .... Slender Jackal (Canis anthus), .... The Domestic Dog, The Dingo (Canis dingo), Group of the Foxes (sub-genus Viilpcs),. Black-backed Jackal (Canis mesomelas), . Aguarachay (Canis Azarae), .... Fox (Canis vulpes), Corsac (Canis corsac), White or Arctic Fox (Canis lagopus), Sahara Fox or Fennek (Canis zerda), . Viverra Dog or Tanuki (Nyctereutes viverrinus), Long-eared Fox (Otocyon caffer), Cape Hunting-dog (Lycaon pictus), . The Hyaenas (Hysenida), Striped Hyaena (Hyasna striata), Spotted Hyaena (Hyaena crocuta), Brown Hya;na (Hyasna brunnea), Earth-wolf or Aardwolf (Proteles Lalandii), The Cat Tribe (Felida), THE CHEETAHS OR HUNTING-LEOPARDS (Cynail- urus, Fahhad or Maneless Hunting-leopard (Cynail- urus guttatus), Cheetah (Cynailurus jubatus), .... THE TRUE FELINES (Felis), Felines of the Old World, Lion (Felis leo), Tiger (Felis tigris), African Panther (Felis Leopardus), Asiatic Panther (Felis Panthera), Clouded Tiger (Felis macroscelis), Marbled Cat (Felis marmorata), Fallow or Gloved Cat (Felis maniculata), . The Domestic Cat, Wild Cat (Felis catus), Viverrine Cat (Felis viverrina) Serval (Felis Serval), Felines of the New World, . . . . Jaguar (Felis onca), Cougar or Puma (Felis concolor), Ocelot (Felis pardalis), .... Pampas Cat (Felis pajeros), Brazilian Eyra (Felis eyra), Jaguarondi (Felis jaguarondi), . THE LYNXES (Lynx), Booted Lynx (Lynx caligatus), . Caracal (Lynx Caracal), .... Polar Lynx (Lynx vulgaris), Spanish Lynx (Lynx pardinus), . THE FOSSA (Cryptoprocta fcrox), The Viverrines (Viverrida), .... THE CIVETS (Ailuropoda), .... Common Genet (Genetta vulgaris), . Civet Cats (Viverra Civetta and Zibetha), . Delundung or Linsang (Prionodon gracilis), Paradoxures or Musangs (Paradoxurus), . PAGE 139 I4O 141 141 142 144 144 H5 H5 146 148 149 150 IS' 152 IS2 154 I56 157 '57 157 158 162 162 162 I63 163 I65 1 68 1 68 170 170 171 171 172 '74 '74 '75 '75 176 179 1 80 1 80 1 80 1 80 181 182 182 183 184 1 86 1 88 1 88 189 190 190 211 Common Paradoxure (Paradoxurus typus), Mampalon (Cynogale Bennettii), THE MANGOUSTIS (Cynopoda), .... True Mangoustis (Herpestes), .... Egyptian Ichneumon (Herpestes Ichneumon), . Gray Ichneumon or Mongoose(Herpestesgriseus), Suricate (Rhyzsena tetradactyla), The Bears (Ursida) THE SMALL BEARS (Subursida Cacamizli (Bassaris astuta), .... Crab-eating Raccoon (Procyon cancrivorus), Mexican Raccoon (Procyon Hernandezi), . Common Raccoon (Procyon lotor), Coatis or Proboscis-bears (Nasua), Social Coati (Nasua socialis), .... Kinkajou (Cercoleptes caudivolvulus), Binturong (Arctictis binturong), .... Panda (Ailurus fulgens), Ailuropus melanoleucus, ..... THE LARGE BEARS (Ursida), Polar Bear (Ursus maritimus), .... Gray Bear or Grizzly (Ursus ferox), . Brown Bear (Ursus arctos), .... Black Bear (Ursus americanus), .... Coco-nut Palm Bear (Ursus malayanus), . The Badger and Weasel Family (Mustelida), GROUP OF THE BADGERS (Mclida), . . . 213 Common Badger (Meles taxus), .... 213 American and Indian Badgers, . . . .216 Telagon or Stinking Badger (Mydaus Telagon), 216 Honey- badgers (Ratelus or Mellivora), . .217 Cape Ratel (Ratelus capensis), . . . .217 Skunks (Mephitis), 217 Brazilian Skunk (Mephitis suffocans), . .218 GROUP OF THE MARTENS (Martida), . . . 218 Glutton (Gulo borealis), 218 Bush-dog (Icticyon venaticus), . . . 219 Hyrares or Grisons (Galictis), . . . 219 Tayra (Galictis barbara), ..... 220 Grison (Galictis vittata), 220 Martens (Mustela), ...... 220 Pine Marten (Mustela martes), . . . .221 Beech or Stone Marten (Mustela foina), . . 222 Sable (Mustela zobellina), 223 American Marten (Mustela americana), . . 224 Pekan or Canadian Marten (Mustela Pennanti), 224 Polecats (Putorius), 224 Polecat (Putorius foetidus), 225 Ferret (Putorius furo), 225 Tiger Polecat (Putorius sarmaticus), . . . 226 Weasels (sub-genus Gale), 226 Common Stoat or Ermine (Putorius erminea), . 226 Weasel proper (Putorius vulgaris), . . . 227 Visons (sub-genus Lutreola), .... 227 Siberian Vison (Putorius sibiricus), . . . 228 European Vison (Putorius lutreola), . . . 228 American Vison or Mink (Putorius vison), . 228 Lynx-tooth (Lyncodon patagonicus), . . . 229 GROUP OF THE OTTERS (Lutrida) 229 European Otter (Lutra vulgaris), . . . 229 Sea-otter (Enhydris marina), .... 231 Xll THE CONTENTS. Geographical Distribution and Descent of the Flesh- eaters, 234 THE SEALS (P1NNIPEDIA). Introduction, 239 THE EARED SEALS (Otarida), ..... 241 Steller's Sea-lion (Otaria Stelleri), . . .243 Sea-bear (Otaria ursina), 244 PAGE THE TRUE SEALS (Phocida), . . . . . 246 Sea-elephant (Cystophora proboscidea), . . 246 Bladder-nosed Seal (Cystophora cristata), . . 248 Monk-seal (Lcptonyx monachus), . . . 249 Sea-leopard (Leptonyx leopardinus), . . . 249 Common Seal or Sea-calf (Phoca vitulina), . 249 Greenland Seal (Phoca groenlandica), . . 249 THE WALRUS OR MORSE (Trichechus rosmarus), . 250 Geographical Distribution and Descent of the Seals, . 253 Young of the Brown Bear. RSITY OF ORN\i THE NATURAL HISTORY OF ANIMALS [CLASS MAMMALIA]. INTRODUCTION. THE shortest definition of this important class of the animal kingdom, to which man himself belongs, is as follows: vertebrates with hair and with milk-glands for the. first nour- ishment of the young. It is likewise a definition that gives the only absolutely exclusive charapters of the class, for no other group of vertebrates has hair or milk-glands. General Characters of the Vertebrata — The mammals are in the first place true vertebrates, for, like all the other animals belonging to this sub- kingdom, fishes, amphibians, reptiles, and birds, they have an internal skeleton which forms the axis of the body, and which is composed of a column of separate vertebrae. This vertebral column is crowned by the skull, which contains the brain and the principal organs of sense, and it has in addition two pairs of lateral appendages, namely the fore- and the hind-limbs. This skeleton, which in the higher vertebrates is always formed of bones, is enveloped by muscles which are attached to its individual parts, and these parts thus perform the function of levers on which the muscles act in con- tracting. In most other animals the muscles are attached to the more or less hard skin or external covering. But the skeleton also forms the axis of the body, which is so divided by it that we have on the back (namely in a tube behind or above the solid centres of the vertebrae) the central nervous system, that is, the brain and the spinal column, and on the abdominal side the other organs, those serving for the development of the animal, namely the alimentary system and the organs of respiration and reproduction. Moreover, the skeleton also forms a number of cavities, in which the organs are sometimes so much embedded as to lie in perfectly closed capsules, as is the case, for example, with the brain. None of the Vertebrata have more than two pairs of limbs, a fore and a hind pair; and this also is an essential point of distinction as compared with other animals, for in every other sub-kingdom the limbs or motor appendages, if present at all, are always found in greater number. These limbs may be only in a rudimentary condition or even altogether absent, but their number can never be increased. Different Types of the Vertebrata. — If now we take a glance at the different types of vertebrates with the view of comparing them together, we observe at once a sharp line of demarcation in the terminations of the limbs. In the fishes the limb ends in a considerable number of rays, while in all other living vertebrates the terminal portion of the limbs never has more than five fingers or toes, or, to use the general term employed by men of science, digits. The fishes accordingly are many-fingered ; amphibians, reptiles, birds, and mammals, on the other hand, five-fingered (or five-toed). The num- ber of these fingers or toes may be reduced in the process of development, but every limb in all members of the classes named has always five digits to begin with. This is a fact of great im- portance. We may deduce from it that vertebrates with a smaller number of digits must be descended from five-fingered or five-toed ancestors, and that THE MAMMALIA. those which have five digits on each limb have undergone no modification, but have preserved their original type. Comparison of Vertebrate Types: Ichthyop- sida and Sauropsida. — The five-toed vertebrates when compared with one another show some very remarkable points of resemblance and difference. The amphibians (frogs, toads, &c.) have a number of characters in common with the fishes. Types may be found in regard to which, apart from the structure of the limbs, doubt might be entertained as to whether we should refer them to the one class or the other. These two classes have accordingly been rightly comprehended in one larger group — the Ichthyopsida, a group the members of which breathe, sometimes during their whole life, some- times only in the larval condition, through true gills, which are never developed in the other three classes. A number of common characters unite also the reptiles and birds. As to the fact that the ancestors of the birds were reptiles, that indeed birds are only reptiles which in the course of geological epochs have developed further in a particular direction, probably no doubt can any longer be entertained. The development of the embryos, the structure of the envelopes of the ovum, the peculiarities of the skeleton, which we cannot here enumerate, agree to such an extent, that the uniting of these two classes, at the present day apparently so different, into the single large group of the Sauropsida is fully justified. For the sake of those readers who are not initiated into these investigations, I mention here two facts of great importance: all the Sauropsida have only a single articulating surface (in scientific language a single articular condyle) at the back of the head, with the aid of which the head is rotated on the first vertebra, and all the earliest birds have teeth exactly like those of reptiles. Even yet these teeth sometimes appear in embryonic life, as in the parrots and certain other birds, but they never emerge through the gum, and are re-absorbed soon after their appearance. Position of the Mammalia in the Sub-kingdom Vertebrata. The Mammals accordingly form a third large division, entirely distinct from the other vertebrates. Formerly they were grouped along with the birds as •' warm-blooded " animals, because like these they have a uniform and tolerably high temperature of the blood. Over against these two classes were placed the reptiles, amphibians, and fishes with cold blood, or rather with blood the temperature of which depends on that of the sur- rounding medium. But naturalists have been com- pelled to recognize the fact that this physiological agreement has only a subordinate value. But if, on the one hand, the mammals form a separate group, yet, on the other hand, it cannot be gainsaid that in respect of certain characters they present a surprising resemblance to the am- phibians. Besides in the structure of the ovum this resemblance is also shown in the fact that all mammals have, like the amphibians, two lateral condyles at the back of the head, and that the movements of the head are altogether different from those which are observed in reptiles and birds. Let us take by way of illustration the movements of the human head. When we raise or depress the head, that is, whenever we move it vertically, we allow the condyles to play upon the corresponding articular surfaces of the first neck vertebra; but when we rotate the head hori- zontally, then we cause the first neck vertebra to turn round an upright process of the second. The joints for these two sorts of movements are accord- ingly different. The birds, on the other hand, execute their movements of the head in all direc- tions by means of the single median condyle; they have no second joint of the kind just spoken of. Mammalian Structure — Having thusexplained the position of the mammals with respect to the other classes of vertebrates, we may now occupy our attention with their peculiar structure of body, which in the most highly developed types of this class has attained the highest grade capable of being reached by the bodily structure of animals. General Characters. — In almost all mammals the different parts of the body, such as the head, neck, trunk, and its direct continuation the tail, are strictly marked off from each other, and if these demarcations are sometimes not very clearly seen in the living animal, they are nevertheless always plainly recognizable in the skeleton. The neck may be shortened and so concealed by the flesh that the head appears to be directly connected with the trunk, as, for example, in the whales; but in the skeleton one can always distinguish the neck vertebra;, almost invariably seven in number what- ever the length of the neck may be. This con- stancy in the number of the neck vertebra;, a con- stancy to which a few sloths and the manatee form the sole exceptions, is all the more striking since it is not found to hold good in the case of the other INTRODUCTION. parts of the vertebral column. The tail especially exhibits all possible variations in the vertebrae composing it, both with respect to their number and their form. It may be excessively long, or, as in the anthropoid apes, quite rudimentary. Only in the mammals is the abdominal cavity, which lies partly between the ribs, separated off by a muscular partition, the diaphragm, from the cavity of the chest containing the lungs and heart. Special Characters: (a) The Skin and its Modifications. — It must further be mentioned as a specially noteworthy fact, that the two exclusive mammalian characters, the hair and the milk- glands, are both developed from the skin, which, as in all vertebrates, is composed of two distinct layers, the outer or scarf skin, and the inner or true skin. The scarf-skin or epidermis undergoes the most various modifications. It consists primarily of layers of contiguous cells forming a thin flexible membrane; but it afterwards thickens in certain places, becomes horny and stiff, acquires a further and often very complicated structure, and forms hard callosities, nails, hoofs, horns, and scales. Among these structures belonging to the scarf-skin the hairs, nails, and glands are the most widely diffused. Hair. — In no mammal is the hair altogether wanting, and though in some, such as the whales, it is only very scanty or apparently not present at all, yet traces of it can always be found either in the young animal or in hidden parts in folds of the skin in the adult. Each hair is formed in a depres- sion of the scarf-skin, and it may assume the most diverse forms. We meet with all transitions from the finest woolly or silky down to large coarse bristles and even spines, which serve as weapons of defence, and appear to consist, like the scales of the scaly ant-eaters, of hairs that have grown together. The horns of the rhinoceros, the horny sheaths of animals with hollow horns, as well as nails and hoofs, appear likewise to consist of agglutinated fibres or small plates, often separated from each other by a considerable amount of pulp. In most cases the hairy covering of a mammal is made up of two sorts of hair, soft downy hairs, and a stronger kind, which in certain places de- velops into manes, tufts, beards, and so forth. The depressions or follicles in which the hairs are set are always richly supplied with nerve-endings, which convey impressions of touch. The tactile sensibility conferred thereby is peculiarly well de- veloped in the often very long and thick hairs which form a moustache in many mammals. The general character of the hair-covering, which is in many cases splendidly coloured, forms an impor- tant point in zoology. Equal importance is attached to the nails, claws, and hoofs, in short to all the horny structures, which are almost always present on the toes of mammals, being wanting only in certain types living in the water, such as the whales. Nails. — The nails, which in the apes and mon- keys are flat, and in beasts of prey and many other mammals curved and hook-like, cover only the back of the last phalanx of the toes, while the hoofs envelope it completely. This difference has been employed to distinguish the hoofed mammals (Ungulata) from the nailed mammals (Ungnicn- latci); but this division, in consequence of the large number of intermediate forms, has nothing like the value which was at first attributed to it. Superficial Glands. — Superficial glands, origi- nally formed by an involution of the scarf-skin, are almost universal. They are absent only in some whales. Some of these, the sebaceous glands, secrete an oily slime and are intimately connected with the hair-covering; others, the sweat-glands, appear rather to serve for the excretion of liquids and gases. Those of the first kind may, in certain situations, grow to a very considerable size. This happens mostly in the neighbourhood of the anus and the reproductive organs, but sometimes also on the head, neck, back, feet, and other parts. In gen- eral such large glands are connected with the repro- ductive functions. The products excreted by them are often of a disagreeable penetrating odour, and these glands may therefore serve even as weapons of defence, as in the polecats and skunks. Glands of this nature yield musk, the castoreum of the beaver, and similar products. Milk-glands. — The most important of the skin- glands finally are those which we call milk-glands. They are never absent, but they act only in the female after the birth of the young, and their secretion, milk, which contains all the ingredients necessary for the nourishment of the body, serves to feed the new-born offspring for a longer or shorter period. Like most of the skin-glands they are made up of longer or shorter tubes opening into each other at certain places, and finally opening to the exterior by very delicate canals. It is only in the monotremes that they are seen in their original form, namely, as a bundle of tubes opening separately THE MAMMALIA. at a certain part of the abdominal surface without forming any elevation. In all other mammals there are formed mammary glands provided with warty or even tongue-shaped teats or mamma;, which the young animal can take into its mouth in sucking. These teats may be situated at different parts of the abdominal surface — in front of the chest, in the middle of the abdomen, or even far back in the folds of the groin ; but they are always arranged symmetrically in pairs, and their number is related to the number of young born at a birth. While these teats in the whales are very short and hidden in folds of the skin, they attain a very considerable length in some marsupials, among which animals they either lie in a well-formed pouch or at least between two folds of the skin. In the teats are united the secretory ducts of a number of gland- tubes, and there they form a sort of reservoirs opening to the exterior by one or several mouths. (b) The Skeleton. — We should exceed the limits assigned to our work if we were to go into the details of the structure of the bony skeleton which holds the parts of the body together. We can only touch on certain points which cannot be passed over in a zoological review of the group. The Skull. — The skull forms, with the exception of the lower jaw, a single piece composed of bones immovably fastened together. Two separate parts can be distinguished, the brain-case and the facial region, the latter including the nose, the eyes in part, and the commencement of the alimentary canal, the mouth. To this firmly built skull with immovable parts is articulated the lower jaw, which is composed of two halves united at the chin, and sometimes, as in the apes and monkeys, completely fused together, sometimes separated by a distinct suture, or connected only by ligaments. The im- movable attachment of the bones of the upper jaw and other bones of the skull to each other and to the brain-case is not found in most other verte- brates, in which it is rather the rule for the bones of the facial region to be separate and movable. The upper jaw always consists of two bones on each side; the inter- or pre-maxillary bones in the middle of the mouth, and the maxilla; forming the sides. But these are not movable on each other, but are connected by sutures, and often become quite fused together at a more or less advanced age. In all vertebrates, except the mammals, the lower jaw is composed of several bones connected by sutures. Only in this class does each half of the lower jaw consist of but one bone. We shall have occasion later on to speak of the teeth, which are found only in the bones of the jaws, and form in the upper as in the under jaw only a single row,1 while in most other vertebrates the teeth may be set in all the bones which go to form the cavity of the mouth. The relations between the brain-case and the facial region of the skull vary considerably. The former part is more fully developed the higher the development of the brain, and with it the mental qualities of the animal. The low types, such as the marsupials, have very tiny brains and insignificant brain-cases in comparison with their powerful jaws. But many subsidiary structures may conceal these marked contrasts, especially in the living animal. The cavities known as the frontal sinuses, which are continuations of the cavity of the nose, and are found between the two plates of the frontal bone, may be developed to such an extent that they take up, as in the elephant, considerably greater space than the brain itself. Longitudinal and transverse ridges, which are required for the attachment of the powerful muscles of mastication, may likewise impart to the brain-case a more imposing appear- ance than it would otherwise have. The length of the jaws, which stands in relation to the action of these parts as levers, may undergo considerable variations in accordance with the greater or less degree of savagencss in the instincts of the animal. Yet in spite of these special circumstances affecting the external appearance of the brain-case, it may confidently be asserted that animals have a larger or smaller brain according as they are distinguished by high or low mental endowments, and that the brain-case formed more or less strictly in accordance with the size and shape of the brain enables us to judge approximately of the development of the organ inclosed within it. The Limbs. — We do not intend now to con- sider in detail the structure of the vertebral column, the ribs and breast-bone, but we must make a closer examination of the limbs, the structure of which has often afforded the fundamental distinctions for the subdivision of the mammals. All mammals have originally had paired fore- and hind-limbs, more or less closely connected with the skeleton, in front by means of the bones of the breast and the shoulder-girdle, behind by 1 There is only one partial exception to this statement, namely, in the sub-division of the rodents known as the Duplicidentata (including the hare and rabbit), in which, as stated in the proper place in the body of the book, there are two small incisors behind the two large incisors in the upper jaw. — TR. INTRODUCTION. 5 means of the pelvis. The fore-limbs persist in all members of the class, but the hind ones have dis- appeared in the whales and sea-cows (Sirenia). But this is only the result of a process of degen- eration, and small bones, which are nothing else than the rudiments of these undeveloped limbs, can still be found hidden in the flesh of these animals. The Shoulder-girdle.— What is known as the shoulder-girdle is composed originally of three bones, the shoulder-blade or scapula, the collar- bone, and the coracoid. These bones are still found separate in the monotremes as in the lower five-fingered vertebrates. But in all other mammals the coracoid early becomes fused with the shoulder- blade, of which it then forms a process. The collar-bone is very variable in its development. It might be called the bone of the specialized function of the limb, the bone which enables the limb to act in some particular way. It is, in fact, present in all mammals in which the fore-limb has to perform complicated functions, in which, for example, it is employed as a hand for grasping, as a spade for digging, or as a paddle in swimming; but it becomes rudimentary or vanishes entirely when the limb has merely to support the body in walking and running. The Fore- and Hind-limbs. — The fore- and hind-limbs correspond with each other as regards the composition of their bony framework. The bone of the upper arm (the humerus) corresponds to the thigh-bone or femur, the radius to the tibia, the ulna to the fibula, the wrist to the ankle, the meta- carpus (the bones of the palm of the hand) to the metatarsus (those of the sole of the foot), the fingers finally to the toes ; and in spite of the fact that the elbow and the knee have contrary directions these joints are also homologous. Now nothing is subject to greater variations than the structure of the limbs, which are primarily affected by adaptation to the most diverse modes of life. Is it possible, indeed, to imagine organs more different than the foot of a horse, the paw of a dog, the hand of an ape, the fin of a dolphin, and the wing of a bat? And yet these limbs, so diverse in respect of their structure and function, are all constructed on one and the same ground-plan; they are composed of the same elements, and the filial result has been brought about only by modifications and processes of reduction and sup- pression originally not at all striking, but which have gone on gradually accumulating. In order to understand these transformations we must go back to the primitive conditions which are to be seen, on the one hand, in embryos, and, on the other hand, in the oldest ancestral forms known to us. What do we then see? The limbs of the embryo scarcely differ at all from one another. In the embryo the fore-limb of a bat, which is destined in the adult to support a flying membrane, is exactly like the hind-limb, which ultimately develops into a sort of paw with five toes and curved claws. The limb of a kangaroo does not, in the first instance, differ in any way from that of a monkey or a sheep. The initial form is always the same: a small lobe attached to the side of the body, and having developed on it five rays, the future toes, which are connected together down to their extremities by a membranous continuation of the lobe. One of these rays, which corresponds to the thumb or first digit (for we always count the digits beginning with the thumb or great toe) stands a little apart from the other four, each of which has its axis corresponding to that of the limb itself. The original form of the mammalian limb is accordingly in all cases that of a flipper, the thumb of which stands a little apart, while the digits are all connected together by the skin. From these facts we deduce the conclusion that the webbed feet of the beavers, otters, seals, in short of all mammals living in the water have preserved the original type, which has become specialized in a particular direction, or, in simpler language, has become adapted to a special use, in the fin of the whales and sea-cows. If we trace the development of the flying-mem- brane step by step in the embryo of the bat, we can easily be convinced that this member is only an aerial paddle, the structure of which has re- mained essentially the same as that of the aquatic paddle of the seal. In the flying-membrane of the bat the chief part of the supporting framework consists of the greatly elongated bones of the fingers or digits, but the motion of the membrane in the act of flying is effected by means of the rest of the fore-limb just as in the flipper of the seal, in which the same bones are present, only not elongated and not spread out. Apart from the elongation of the digits and the extension of the membrane necessitated by the gaseous element in which the creature has to " swim," the wing of the bat is thus exactly like the flipper of the seal. It is accor- dingly only a swimming-paddle specially developed THE MAMMALIA. with respect to the surrounding medium, and one that has undergone no other modifications than those affecting the dimensions of the parts. In the other terminal members of mammals the connecting skin extends no further than the roots of the fingers or toes ; but remains of this connect- ing skin are still found in almost all mammals. Then a second fact is likewise conspicuous. The first digit, the thumb or great toe, takes from the very first a different direction from the other digits. This divergence is maintained in most mammals, and in addition to that the fact that this digit has only two instead of three small bones or phalanges contributes to give to it a peculiar position. From a thumb having this difference in direction as compared with the other digits to a true thumb capable of being opposed to the other digits, as in the human hand, there is no very great interval, and we have moreover numerous examples of intermediate forms. Besides, all limbs with opposable thumbs or great toes have five digits, and have accordingly preserved the original number. The Hand. — From these facts we infer that the limbs with the first digit standing apart from the others represent the original form, and that those with an opposable first digit, in one word, hands, are a very old type. We find, in fact, hands on the hind-limbs in opossums and phalangers, lemurs and monkeys; and in the two latter groups we have in addition hands on the fore-limbs, which are the only ones that persist in man. Although the hand is indeed a wonderful instrument, it is never- theless a very old pattern. How could the marsupials just named, which are among the lowest mammalian types, possess hands if these members represented the last and highest stage of develop- ment of the limbs? If then a five-toed foot with the first toe standing apart from the others is the primitive form, one that we meet with in the oldest mammals known to us, all the other forms of limb, often very much modified, must necessarily have originated in this fundamental type. This modification has been brought about mainly by the degeneration of separate parts beginning with the digits and proceeding upwards, but is also due in some degree to the excessive development of other parts. For details regarding this matter we refer the reader to what is said with reference to the separate orders. One will be able to judge of the enormous influence which has been exercised by the processes of reduction and fusion (the entire loss of certain bones, and the merging of two or more into one) by comparing two extremes, for example, the fore-foot of a porcupine ant-eater (Echidna) and that of a horse. The former is five- toed and has the full number of bones, namely thirty-three; the latter is single-toed, has fused and degraded bones, and the total number of the bones is only seventeen, and two of these (two bones belonging to the metacarpus) are functionless. The process of reduction can in this case be traced both in the embryo and in ancestral forms, which lay buried in past geological strata; and from all these facts we may draw the general conclusion, that all mammals with reduced or degraded digits must be descended from ancestors with complete five-toed feet, and that these modified feet are the result of a longer or shorter series of successive variations. The Position of the Limbs in Walking: Digitigrada and Plantigrada — One last point still remains to be explained. The limbs carry the body, but they carry it in various ways. The ruminants as well as the horses, the cat tribe as well as dogs and their allies, place only the points of their toes on the ground ; they are Digitigrada. The apes and monkeys, the Prosimii (lemurs, &c.), bears, most of the marsupials and the monotremes touch the ground with the entire sole, including even the wrist and ankle; they arc Plantigrada. In certain orders we can follow the process of raising the sole above the ground step by step, so that the designations Semi-plantigrada and Semi- digitigrada have been adopted for certain stages in this process, although no great value can be assigned to these sub-divisions. Yet the fact itself does not thereby lose its importance, for all the old Eocene mammals are plantigrade, whether Carnivora or Ungulata, Perissodactyla or Artio- dactyla, Insectivora or Rodentia. From this we conclude that all the Digitigrada have had planti- grade ancestors, and that the plantigrade mode of progression, such as is found in man himself, must be regarded as a primitive character which has been retained. The Teeth. — One of the most complicated chapters in the natural history of the Mammalia is that which relates to the teeth, and we readily con- cede that it presents difficulties that might deter more than one reader who did not wish to make any special study of the subject. Although we are far from wishing to disguise these difficulties, yet we must take the subject resolutely in hand, for INTRODUCTION. not only does the division of the Mammalia into subordinate groups depend in a great measure on the dental system, but this system also possesses the great value of being the essentially conservative element of the whole skeleton. If all the variations in the surroundings, in the nature of the food, and the mode of life are reflected in the structure of the teeth, there is, in fact, no other part of the skeleton accessible to the palaeontologist which preserves the essential characters of a type with such certainty, and in this way enables him to recognize the points of resemblance and affinity that may obtain among the different forms. In any case the study of the dental system forms the foundation of a knowledge of the Mammalia generally. Only an infinitesimally small number of mammals are actually without teeth. The porcupine ant- eaters, the ant-bears, the scaly ant-eaters, and the whalebone whales belong to the number. Yet teeth have been found in great numbers in the jaws of embryo whales, but these teeth are com- pletely embedded in the gum, which they never cut, and are afterwards re-absorbed when the whalebone has formed in the mouth. It is likewise highly probable that traces of teeth will yet be found in the jaws of the embryos of the terrestrial mammals mentioned. Analogy seems to prove that the absence of teeth in mammals is always the result of a process of reduction carried to the last extreme. Structure of the Teeth. — The teeth of mam- mals are formed in closed sacs or depressions in the jaw, and do not cut the gum till they have reached an advanced stage of development. The proper nucleus of a tooth is composed of the so- called dentine. This peculiar bony substance is characterized by the presence of numerous branch- ing canals (tubuli) which run from the inner cavity of the tooth (the pulp cavity) towards the surface. Whatever the subsequent form of the tooth may be, this dentine is always originally deposited as a sort of cap round a fleshy protuberance rich in vessels and nerves, and the hollow of this cap is filled with dentine. On the latter there rests in most cases a second cap composed of very hard columns set close to- gether, and forming what we call the enamel. This shining brittle substance usually covers only what is called the crown of the tooth, that is, the part that rises above the gum. For the most part the crown is protected on all sides by this covering; but in many cases, as, for example, in the incisors of rodents, we find it mainly on the front of the crown, and only a very thin plate behind. The enamel thus extends in general as far as the gum, and thus serves to distinguish the crown from the root, which is set in the gum. Besides these two chief substances, there are frequently also other tissues entering into the composition of a tooth — true bone-tissue at the root and cement on the crown, this last substance being peculiarly abun- dantly developed in compound teeth, in which it fills up the folds and other depressions. In the structure of the roots or fangs considerable diversities appear, in consequence of which we have teeth that keep constantly growing and others with a limited period of growth. Consider, for instance, the incisor of a rodent. The pulp cavity opens out wide at the lower end, where the dentine gradually thins away, while the pulp nourishing the tooth fills up the whole cavity. Teeth so formed keep on growing through life, and this constant growth is counteracted only by the fact that the crown gets constantly worn away by use. The tusks of the elephant and those of the wild boar are both of this nature. In a number of other teeth, however, the pulp cavity gets gradually narrower towards the bottom, where it forms at last only a minute opening. This condition is brought about in the course of the development of the tooth, for at first the root is always wide open, and after this constriction of the pulp has taken place the tooth ceases to grow, since the vessels that ascend through it are only sufficient for the nourishment of the tooth. Most of the teeth of mammals have this structure. They may be replaced by a later set pushing out the earlier ones; but once formed they undergo no further change in the way of growth. Teeth with several fangs are found only in mammals. A tooth with a double or treble fang belongs unquestionably to a mammal; and, indeed, most molars and premolars have compound fangs, while incisors and canines, with very few exceptions, have only single roots. From our description it will be seen that the more or less conical teeth with open roots, such as we find, for example, in the dolphins, represent the original form, a form which is also found in the reptiles and amphibians. The closing of the root and the cessation of growth mark a higher stage of development, which leads to a phenomenon occurring only in the Mammalia, namely, the 8 THE MAMMALIA. appearance of two sets of teeth in succession — the milk and the permanent teeth. Milk and Permanent Teeth: Monophyodonts and Diphyodonts — The jaws of embryos and young animals are relatively very short; but after- wards they often become immoderately long. The consequence of this elongation is that the first teeth, which sometimes appear before, but mostly not till after, birth, cannot occupy the jaws through- out their whole extent. A second set of teeth is accordingly developed, altogether independently of the first, and through the appearance of this second set the number of the back teeth is in general increased, while those in front are more or less completely replaced by new and better arranged teeth. Whatever be the mode in which this ex- change is effected, and whatever processes nature may resort to in attaining this end, we must before all things keep in view the very considerable altera- tions that are thereby brought about. First, it is manifest that this exchange is neces- sary only where the teeth have a limited period of growth. The teeth which keep constantly grow- ing have no need to be renewed, though their number or their size may have to be increased in proportion to the growth of the jaws. The Cetacea and the Edentata, in which no exchange whatever takes place, have been distinguished as Monophy- odonts, the others, which have two sets of teeth in succession, as Diphyodonts. Yet here also there are essential differences. The last stage of development, which is attained by the apes and monkeys and the carnivores, is very simple. All the front teeth, incisors, canines, and premolars, which form the milk dentition of a child of about seven years old, are deciduous, and are replaced one by one by new teeth, while a few molars are added in the back part of the jaws. In such cases the distinction between the milk and the permanent dentition will always be pretty easy. More frequently, however, these relations are very far from being so simple. Certain teeth, both of the first and second set, develop indeed to a certain stage, but never cut the gum. They remain entirely embedded in the gum and are afterwards absorbed. Others drop out shortly after they have appeared, and if they belong to the milk dentition are not replaced by permanent teeth. Finally, the number of the teeth which are exchanged is also very variable. Thus in the marsupials only a single tooth, the last premolar, is shed, while all the others remain in their original places. The order in which the teeth are replaced is just as variable as the time at which this phe- nomenon occurs. Some bats, for instance, lose their first teeth while still in the womb of the mother. In many cases, moreover, the first set of teeth is very different from the second, and, indeed, often has a considerably different character. The aye-aye is an insectivore in its milk dentition, but in its permanent dentition a rodent. And if the entire dentition does not often alter its character, this is frequently the case with at least a certain number of the teeth. The carnassial tooth of the Carnivora alters its place. It travels, so to speak, towards the back of the mouth in the permanent dentition. The general fact remains, however, that a certain number of back teeth are never shed, and only appear once for all, namely, at the time when the shedding of the other teeth is in progress or nearly completed. These teeth commonly have a more complicated form than the others. They are those which are called true molars. But let us return to the teeth themselves, and consider first their form and structure. If the form of a simple cone, a cylinder, or a column is the primitive one, the form which is still retained most frequently in the front teeth, it cannot be asserted nevertheless that it is the form universally retained. It may be materially modified by the presence of notches and folds, clothed with enamel, and situated either on the grinding surface or on the sides of the crown. If such folds are found on the grinding surface, then there arise grooves and depressions, between which higher parts remain standing in the form of tubercles, ridges, and peaks. All these structures may be reduced to three leading types. In one the tubercles get worn down to a level surface and remain low; they are broad and rounded, the crown likewise becomes flat and more or less quadrangular. This is the type of the omnivorous tooth, such as we find in pigs, bears, and others. Secondly, the tubercles may be pointed and get worn away on the lateral surfaces by friction against the teeth in the opposite jaw. In this manner are formed the teeth with pointed cusps of the insect- eaters. Thirdly, the tubercles may be elongated in the direction of the jaw into sharp lobes, which act like shears against the corresponding lobes of the opposite teeth. Of this type the teeth of the carnivores offer striking examples. The lateral folds of the crown, which in the first instance are mere vertical flutings, may become INTRODUCTION. more pronounced, and may be found on one side only or on both at once. We then get teeth which, like those of the rodents, exhibit folds or grooves on the worn surfaces. These folds gradually become in different animals more sinuous and deeper, till at last they meet in the interior, and give the teeth the appearance of being composed of two halves, or of two columns set together on the grinding surface of the tooth like half-moonshaped islets, and making it appear as if the teeth had been subjected to a certain amount of pressure. All these different and variable forms are nevertheless deducible in the end from a crown with sharp or blunted tubercles; and the oldest placental mammals exhibit such types with varying characters, types which we now designate as insectivorous or omnivorous teeth, and which may develop further in the one direction or the other. Palaeontologists have made the observa- tion that the folds of the teeth are originally re- markably simple, but always become gradually more complicated in their descendants. The series of teeth observed in the development of horses and ruminants afford excellent examples of this in- creasing complicacy. The forms with deep folds dividing up the .teeth may be combined with others which appear to have arisen from the fusion of several small teeth. The molars of the elephants present the most complete example of this type, in which tooth-fragments are agglutinated together by cement into a single large tooth. On the other hand, it would be possible to maintain, if we traced the series of teeth from the mastodons downwards through the extinct ele- phants, that these tooth-fragments, each of which has a separate root, have arisen from a continued process of division. But, however that may be, the structure of the teeth and the arrangement of the different kinds afford the surest marks for distinguishing affinities between the different mammalian types. Usually the teeth are divided in accordance with their position in the jaws, but with reference also j to their forms and the relations brought to light when the milk-teeth give place to the permanent set. We will now give the explanation of the terms made use of in describing the dentition. The upper teeth are set in two pairs of bones, the premaxillae in front and the maxillae behind. All the teeth set in the premaxillae, whatever be their form, are called incisors. The tusk of the elephant, as well as the curved, sharp-edged, chisel- shaped tooth of the rodent, the pyramidal tooth of the musquash or North American musk-rat (Fiber zibctliinus), and the recurved hook-like tooth of the shrews, are all incisors, for they are set in the premaxilla, the separation of which from the maxilla remains almost always visible in the mammals. In the lower jaw, which is composed of a single bone on each side, the mandible, there is not the same valuable criterion for distinguishing the in- cisors as in the upper jaw; and in it all those front teeth which present a greater or less resem- blance to the incisors of the upper jaw are generally distinguished by the same name. After the incisors there often comes a recurved tooth which in most cases rises above the level of the others. This, which is especially characteristic of the carnivores, has been called the canine. But it is found also in omnivorous animals and even in certain herbivorous ones, for instance, in the musk- deer, and is especially large and powerful in the male, in which it is a weapon not to be despised. In the rodents, in most of the ruminants, and in fact in many mammals, it is wanting altogether, or is found only in the upper jaw. Behind the canine is developed the series of molars, which are divided into premolars and true molars. The only means which we have for distinguishing these two groups from each other is that afforded by the exchange of teeth. The term premolars is applied to all those which are shed and get replaced by others, while those which belong solely to the permanent dentition are designated true molars. But in practice it is often difficult to carry out the distinction from this point of view, since the milk dentition is not always known. In that case the 'first four of the row of teeth situated immediately behind the canines are commonly known as premolars, being mostly distinguished from the succeeding ones by their simpler form. In order to express the distinctions presented by these teeth naturalists have devised certain formulae, of which we have made use in this work also, and which we must therefore explain. Different authors have naturally adopted different formulas, but we have employed those which appear to us the simplest. Dental F ormulae .— The teeth are always arranged symmetrically; on the right side there is always the same number of teeth as on the left. It is conse- quently sufficient to give those on a single side. On the other hand, the number of the teeth in the upper jaw is often considerably different from that 2 IO THE MAMMALIA. in the lower. Accordingly two rows of figures are adopted for the two jaws, and the numbers are arranged in accordance with the terms explained above. Suppose, then, the reader meet with the following formula: — - = 44; how would J " J * T" he have to understand it? The row above the line gives the teeth standing in one half of the upper jaw; and the animal thus has in each half of that jaw four incisors, one canine, four premolars, and three molars, in all twelve teeth, or twenty-four in the whole jaw. In the lower jaw, on the other hand, there are only three incisors, no canine, three premolars, but four molars, accordingly ten in all in each half of the jaw, or twenty in the whole jaw. For this animal consequently the total number of teeth amounts to forty-four, and since all the sorts of teeth are here represented the dentition is called a complete one. If the premolars and molars cannot be distinguished they are included in a single figure, as thus: — I . o . 4_ = 20. This is 1.0.4 the formula of a rodent, and intimates that the animal has one incisor above and below in each half of the jaw, and four molars which cannot be more particularly discriminated, and that in both jaws the canine is wanting. But the dentition may be altered not merely by the substitution of a permanent for a milk set, but also by another process, namely by the premature disappearance of certain teeth in the course of years. At bottom this phenomenon is only a con- tinuation, or the carrying out to a further stage of that already mentioned, the non-development of teeth the rudiments of which appear in the gum. This premature disappearance is a very frequent occurrence, and is observed especially in the more recent mammals when compared with their im- mediate predecessors, which retained throughout life certain teeth which their descendants lose after a short period. Evolution. — These facts lead us into a higher region, that of the gradual perfecting of the dental systems during the evolution of the ances- tors of the present mammals carried on through past geological epochs. Now what is this pro- cess of evolution, and by what facts is it recog- nized? The answer to this question is not by any means easy to give. So far we know only a few large general features of the picture which it will remain for the future to complete. For the present we will only briefly summarize a few of the most important facts. We are not acquainted with any mammals belonging to a very early period with simple conical teeth altogether unspecialized. We know, however, some mammals now living, and among these are included the dolphins and the giant armadillo, which possess such teeth in almost un- limited number — it may be a hundred or more. Now these teeth, like those of the lower vertebrates, are all similar, and are set so far apart from each other that, when the mouth is closed, the teeth of the one jaw fit into the gaps left between those of the other. As soon as the teeth begin to exhibit a more specialized form, their number becomes limited. Yet in the older mammals this number is still considerable, and some of the marsupials now living have retained this character, the possession of a large number of teeth. We have only a few lower jaws of marsupials belonging to Triassic and Jurassic times, and these are equipped with an. unusually large number of teeth. Dromatherium from the Trias has fourteen, Amphitherium from the Stonesfield Slates (Oolitic series of the Jurassic strata) sixteen, Phascolotherium, from the same slates, eleven teeth in a single half of the lower jaw. Now, if we assume that the same number was present in the upper jaw, then we get totals of 56, 64, and 44 teeth. The fauna of the present day includes the banded ant-eater (Myrmecobius) with 54, the opossums with 50, the bandicoots (Peramelida) with 48, the Tasmanian wolf (Thyla- cinus) and the genus Phascogale with 46 teeth. The Monodelphia of the Tertiary period have all 44 teeth, and among the Monodelphia of the present day there is only a single genus, Otocyon, belonging to the Carnivora, in which this number is exceeded. In it there are 46 teeth. But all these teeth are specialized. Fully de- veloped incisors, canines, premolars, and molars can be distinguished even in the oldest mammal of the Trias, the Dromatherium, and if the front teeth stand more or less apart, the back ones begin to press more and more closely on one another, and show the characteristic double fangs. We can trace these combined modifications in following out the evolution of a particular series. As the dentition becomes transformed from the general omnivorous or insectivorous type to one of a more special character we see the teeth reduced in number, and at the same time more and more INTRODUCTION. ii individualized with respect to form and complexity of structure. Here, accordingly, we meet with a course of development analogous to that observed in the limbs: reduction of the number of the con- stituent parts, and specialization of the functions belonging to these parts. With reference to this we must not forget that the oldest mammalian dentitions known to us possess all sorts of teeth in exceptionally great number and with closed roots, and that accordingly every incomplete dentition must be the result of a process of development, and that development frequently retrograde, or from a higher to a lower type. Reproduction — We may pass over the other features in the structure of the mammals in order to dwell at somewhat greater length on the peculi- arities pertaining to their reproduction. And here what we have to concern ourselves with is not the number of young ones produced, which varies re- markably according as the struggle for existence is more or less easy for an animal, but the pheno- mena on which certain subdivisions of the Mam- malia have been founded. All mammals bring forth the young alive, and the young are suckled by the mother for a certain period after birth. Yet there are considerable differences in the relations subsisting between mother and young before birth. In some, which are called Didelphia or aplacental mammals, there is no intimate connection between the ovum and the maternal organs in which the earliest development of the embryo is accomplished. The envelopes of the embryo, the amnion, and the allantois, are indeed formed, but the latter mem- brane does not enter into connection with the walls of the uterus. The ovum remains entirely free, and the embryo is ushered into the world in a compara- tively backward stage of development, although, indeed, provided with all the essential organs. The monotremes and marsupials, which are thus reproduced without a placenta, exhibit at the same time all the marks of a strikingly low position in the scale of being. Their brain is scarcely more highly developed than that of reptiles, and as regards the structure of the axial skeleton, as well as that of the teeth and limbs, we have already seen that it agrees in many points with that of the oldest mammals. Much more intimate is the connection which subsists between the fruit of the body and the mother in the great majority of mammals, which are called Monodelphia or placenta! mammals. In them the blood-vessels of the embryo, which are brought through the allantois to the surface of the ovum, form in combination with those of the uterus a special organ known as the placenta. The vessels belonging respectively to the allantois and the uterus do not run into one another, or, in technical language, anastomose, but return in loops on each side, and the gaseous and liquid substances contained in the blood that circulates in them are exchanged solely by the process of osmosis, that is, by filtering through the walls of adjoining vessels. The embryo has its blood purified, and is fed by means of the placenta. The blood of the mother conveys to it the requisite supply of oxygen and the other substances necessary for its life and growth, and at the same time removes the carbonic acid and other refuse products of its vital action. The formation of the placenta is thus a fact of the highest importance, and one can easily understand why the first place has been assigned to it among the characters on which a natural division of the Mammalia is based. May this also be the case now with respect to the form of the placenta? I take the liberty of doubting this, in spite of the authorities who lend their support to the maintenance of this view. When a division, based on the form of the placenta, was first proposed I gave in my adhesion to it, but now I believe, in view of more recent discoveries and in consequence of certain more profound investigations, that we are entitled to assign to the form of the placenta only the value of a subordinate character. We can indeed trace the development of the placenta step by step in our mammalian forms. The ovum is from the first surrounded by an external membrane, the chorion, and this gradually becomes covered with cellular processes called villi, into which the embryonic vessels penetrate. These villi get inserted into simple pits or de- pressions in the mucous membrane of the uterus, known as crypts, from which they can easily be detached. Therewith begins the formation of the placenta proper, and in many animals the relations between the mother and the fruit of the womb are confined to these simple vascular villi. But the latter become -more complicated; they give off branches, penetrate further into the mucous membrane, get aggregated into certain spots, which, however, are distributed over the whole surface of theovum.and in that way form so-called cotyledons, each of which consists essentially of a bundle of 12 THE MAMMALIA. vessels; and though all of them become detached at birth from the mucous membrane, this happens with greater difficulty than in the former case. These forms, with the numerous intermediate varieties, have all been comprehended under the general designation of indeciduate placentas. In other cases the cotyledons are all congregated to- gether at certain parts, become intimately united with the maternal organs into a single organ, and at birth at least a portion of the mucous membrane of the uterus, the so-called decidua, always becomes detached and extruded. Mammals with such a form of placenta have been called Deciduata, and among these, two chief forms have been distinguished, one in which the placenta is shaped like a belt sur- rounding the ovum, the so-called zonary placenta, and one in which it has the form of a cake, the discoidal placenta. But these structures represent only higher stages of development, and in many cases approach one another so nearly that, for example, investigators are not yet agreed whether to ascribe to the Prosimii a bell-shaped deciduate placenta, or simple chorionic villi congregated together at one pole of the ovum. The division of the mammalian orders according to this principle would be somewhat as follows: — (i.) Indeciduata. (a) With simple chorionic villi (diffuse placenta). Cetacea, Sirenia, Perisso- dactyla, Pigs, Hippopotamuses, part of the Rumi- nants (Camels and the genus Tragulus), Scaly Ant-eaters (Manis), Prosimii; (b) With branched chorionic villi (scattered cotyledons) ; the rest of the Ruminants. (2.) Deciduata. (a) With zonary placenta: Carnivora, Pinnipedia (Seals), Proboscidea, Hyrax; (b) With discoidal placenta: Rodentia, Insectivora, Chiroptera, Simiae, Edentata (with the exception of the scaly ant-eaters). In whatever way we look at this arrangement it must always be acknowledged that it involves absurdities. It is impossible to deprive the hyrax and the elephant of their affinities to the other Ungulata, in order to rank them with the Carnivora, or to place the scaly ant-eaters at the one end of the series, while the common ant-eaters are found at the other; and the group of the Artiodactyla, or even- toed ungulates, shows us that one type may have retained the primitive structure of the placenta, while another very closly allied type (that of the Perissodactyla, or odd-toed ungulates) has attained to a much higher degree of perfection in this organ. Distribution in Space. — In treating of the indi- vidual orders of the Mammalia we have always added a concise survey of their geographical dis- tribution, and have sought to combine the results arrived at with the probable presumptions as to the evolution of the stock. We therefore explain in this general introduction the points of view from which we have regarded this part of the subject. Formerly it was attempted to explain the un- deniable discrepancies in the distribution of animals over the earth by the assumption that they were ascribable to the surrounding conditions, and especi- ally the climate, the supplies of food, and in short all those influences which can make themselves felt in particular regions. This supposition undoubtedly rested on actual facts. The influences which the surrounding media have exerted on the struggle for existence cannot be denied. If the animals be- longing to northern regions and lofty snow-clad mountains were seen to become white in winter, there was in that single fact manifest proof of the adaptation of the organism to external conditions. But such facts were far from exhausting the problem. There remained too many doubts as to a number of circumstances, particularly in view of what had been effected on this field by man. The horses, cattle, and sheep introduced by him into America and Australia succeed there much better, or at least quite as well as at home. Moreover, these animals revert there to the wild condition, and are not only adapted by their own powers for the struggle for existence, but are even victorious in that struggle over the native animals. How then does it happen that such extraordinarily favourable conditions of life have not brought into existence these animals there as in other lands? South America is just as rich in monkeys as the forests of India and Africa. How then does it happen that the apes and monkeys on both sides of the ocean are so different from one another? And if monkeys can live in all hot regions of both hemispheres, why do we not find antelopes, elephants, rhinoceroses, cattle, and insectivores, as well upon the one as upon the other? I could multiply these examples endlessly, but they would all confirm the insufficiency of the alleged grounds for the discrepancies in distribution. The Darwinian theory of the origin of species could not but introduce other points of view. Since our animals of the present day are direct more or less modified descendants of the extinct ones, the geographical distribution of the present day can manifestly be only the consequence of that of the primitive stocks. These have formed, if I INTRODUCTION. may so express myself, the raw material which all the various influences that can bring about more or less well-defined variations, have worked up within the limits assigned by the distribution of land and water. The present geographical distribution of mammals is thus intimately related to their origin. Land mammals descended from ancestors which were restricted to a continent, forming an island sur- rounded by the waters of the ocean, have not been able to develop on another continent inaccessible to them, however favourable the conditions of life there might be. Broad rivers, high mountain chains, deserts, and marshes could not but hinder the advance of certain types, and have actually pre- vented their introduction into regions which were cut off by barriers of that nature. Every species, however strong or weak its powers of reproduction and organs of motion may be, would actually be distributed over the whole earth through its multiplication in geometrical progres- sion and its consequent migrations, if it were not confined by such barriers, and had not its ranks thinned by enemies and by the absence of the con- ditions of existence. The various causes have acted in former times just as they are acting at the present day, and their combined effects and mutual action and reaction are expressed in the present geographical distribution of animals. In his admirable work on the Geographical Dis- tribution of Animals Wallace adopts six great regions l in which the animals are grouped in a special manner. Three of these belong to the Old World, two to America, and one to Australia. Each of these regions has besides a certain number of sub-regions. The great Palaearctic region comprises the whole of the Eurasian continent, except the south-east, together with the islands of Japan, Iceland, Great Britain, the Azores, the Can- ary Islands, and the islands of the Mediterranean. It comprises the whole of Europe, Africa as far as the Sahara and the Cataracts of the Nile, also Asia Minor, Arabia, and the entire continent of Asia as far as the large mountain chains of the Himalayas — an enormous region, in which Wallace endeavours to distinguish a European, a Mediterranean, a Sibe- rian, and a Manchoorian sub-region. The great /Ethiopian region comprises the African con- tinent south of the Sahara, and in addition to that, as a sub-region, the island of Madagascar. The 1 They are adopted with certain modifications from a division of the earth originally proposed by Mr. P. L. Sclater for birds.— TR. great Oriental region embraces Asia to the south of the Himalayas, together with the Sunda Islands and the Philippines. The Australian region is not restricted by Wallace to the large island of Australia with Tasmania, but extends also over all the islands from Celebes to the Sandwich group. South America, with Mexico, Guatemala, and the Antilles, form the Neotropical region, and the rest of North America finally constitutes the sixth, the Nearctic region. Of these regions, as of all others that have been adopted, it may be said that none of them is limited by precise boundaries, even if we leave out of ac- count the more or less cosmopolitan animals, and devote our attention only to forms confined within narrow limits. If we would represent these regions on maps, we must surround each of them with a pretty extensive zone in which the forms have intermingled or passed from one region into the other. Besides there are in this scheme areas which have been ranked as sub-regions, and which yet deserve a separate independent position, at least in respect of their mammalian forms. Thus we must undoubtedly adopt a Circum- polar region, embracing the north of Siberia, Lapland, Greenland, the Hudson's Bay Territories, and all the islands adjacent to these portions of the mainland. In all parts of this region are found the same, or at any rate very closely allied, species: to it belongs the territory of the polar bear, the rein- deer, the glutton, the lemming, and other charac- teristic forms. The island of Madagascar is totally different from the mainland of Africa in respect of its mammalian fauna, and, in general, is one of the best characterized regions. The Antilles also have scarcely anything in common with the neigh- bouring mainland. If these three regions are separated off as of equal value with the great leading regions above named, we then have nine regions marked off for the geographical distribu- tion of mammals, and each of these is distinguished by a separate assemblage of animals, by its own peculiar fauna. In order to understand the partly strange partly uncertain boundaries of these regions we must have recourse to the indications furnished, on the one hand, by geology as to the relations between land and water in earlier epochs, and, on the other hand, by palaeontology concerning the existence and dis- tribution of mammals which lived in those epochs. In many cases these indications are still very incom- plete, in others more or less uncertain. In such THE MAMMALIA. cases we must be content to recognize the fact of these gaps and uncertainties, while utilizing in our investigations the assured results that have hitherto been obtained. We will speak in the first instance only of land mammals. And here we are at the outset struck by the fact that those boundaries, on the one hand, separate territories that are manifestly continuous at the present day, and, on the other hand, unite others now distinctly separate; and that finally among these last cases we meet with examples in which the mammalian distribution in different regions is strikingly diverse in spite of the apparent correspondence in geographical relations. Such examples are easy to find. The channel between the island of Trinidad, the most southerly of the Antilles, and the mainland, at the mouth of the Orinoco, has almost the same breadth as that which separates the British Isles from the European continent. But what a differ- ence is revealed in the mutual relations! The mammalian fauna of England is in no respect different from that of Brittany, while in the case of Brazil and the Antilles almost everything is dif- ferent. In Brazil monkeys, carnivores, and eden- tates are uncommonly well represented, and of these groups the Antilles show no trace. Brazil, on the other hand, does not support a single insectivore, while the Solenodons are confined to the Antilles. Only a few rodents, bats, and pec- caries are common to Brazil and the archipelago named. These differences are explained when we learn from geology that at a recent epoch England was continuous with the mainland, that the animals of the Quaternary period, the immediate ancestors of our present mammals, walked dry-footed across the English Channel, while the interval of sea which presents such an insurmountable barrier between Trinidad and Brazil is in process of being filled up by the alluvial deposits of the Orinoco, and formerly was much broader. We might think it strange also that the whole circumference of the Mediterranean is regarded as a continuous sub- region, while the main body of the continent of Africa, apparently directly connected with it, is completely separated by the Atlas Mountains; but for this also geological investigations have furnished the explanation. The Strait of Gibraltar is due to an irruption of the sea of comparatively recent date; more than one isthmus ran from the northern shores of the Mediterranean towards the southern, and the Sahara has constituted, at least in the more recent geological epochs, an insurmountable barrier for most species. Combining in this way the facts furnished by geology on the one hand, and palaeontology on the other, we can arrive at certain conclusions regarding the origin of the mammals and their geographical distribution, conclusions which must be summed up in the subdivision of the class. Of this we give a tentative sketch. Subdivision of the Mammals based on the presumed Order of Evolution. — Passing over in the meantime the aplacental mammals, the mar- supials and monotremes, reserving all that we have to say on this lowest group for the chapters in which we deal with the two orders named, we call to mind by way of preface only these facts: that the oldest mammalian remains are found in the upper Trias; that the only complete jaw known from that epoch, the jaw of the Dromatherium found in North America, is incontestably that of a small insectivore; that the remains derived from the Oolitic strata of Stonesfield and the Purbeck limestones belonging to the upper Jura in England, and from the United States, likewise show in great part an insectivorous dentition; that, however, genera are to be found among them in which the dentition is allied to that of the kangaroo-rats; and that, finally, the last representatives of the marsupials from the Eocene deposits in France exhibit striking affinities to the opossums of America. The history of the evolution of the placental mammals, or, in technical language, their phyloge- netic history, begins with the Tertiary formations. With these a number of placental forms suddenly make their appearance, and in the various sub- divisions of the Tertiary epoch, the Eocene, Miocene, and Pliocene, as well as in the sub- sequent Quaternary epoch and the present age, the number of these forms goes on increasing, and the families and tribes still subsisting are gradually developed. But it must be remembered that beneath the Tertiary formations there is a vast gap. The rocks lying beneath the Tertiary in the geological scale are the Cretaceous, and from them we know of no mammalian remains whatever. Beneath the Cre- taceous again are the Jurassic and Triassic strata, in which we have indeed mammalian remains, but these solely of aplacental forms. What, then, was the history of the mammals during the intervening period? When did the primitive stocks of the present placental forms first make their appearance? INTRODUCTION. Can we fill up the gap by supposing that there arose at some period within it a single placental type from which all the present forms are descended? Or must we assume more than one primitive placental stock to account for the present diverg- ences among the members of the class? The answers to these questions must necessarily be based largely on speculation, and though the facts that have been ascertained may justify pretty confident conclusions with regard to some of them, we are inevitably restricted to hypothesis when we attempt to trace the history or evolution of any particular group. So much, however, is certain. After the long gap between Jurassic and Tertiary times there appear with the Eocene both in the Old World and the New the following still surviving orders: Prosimii, Insectivora, Carnivora, Perissodactyla, Artiodactyla, Rodentia, and in the Old World alone, the Chiroptera. All these orders are represented either by families which are now quite extinct, or by equivocal types which cannot be referred to any family, or, lastly, by forms still existing. Thus the Prosimii in France have furnished a genus allied to the Potto, while the other families are extinct. Further, leaf-nosed and smooth-nosed forms are found among the bats; tanrecs, moles, and shrews among the Insectivora; Canida and Viverrida among the Carnivora; tapirs and horses among the Perissodactyla; pigs among the Artiodactyla; squirrels, dormice, mice, degus (genus Octodon), and spiny rats (Echimyida) among the rodents, together with extinct families and indeterminate types, from which families better characterized can be derived. This accordingly is the oldest nobility among the placental mammals, whose family trees can be traced back to the Eocene. The roots manifestly reach much further back, but we have no certain knowledge of them. Let us now consider this fact in the light of the present distribution of mammalian forms. Seeing that all these orders in families already existed in Eocene times, if there is any region of the globe from which they are altogether absent, or in which they are poorly represented, that deficiency must be accounted for. It is universally found that when a higher type appears it tends to displace the lower. The latter becomes extinct, or gets reduced to a few representatives enabled by special circumstances or habits to survive. They may escape even amidst the competition of higher forms through the fact of their living on trees, and thus being out of the reach of many enemies, or through being able to hide in burrows, or being nocturnal in their mode of life. But, apart from such special favouring conditions, the doom of the lower type is to dis- appear before the higher, and since the higher placental forms were already largely represented in Eocene times, we must ask how it is that any region of the earth has escaped being overrun by them. Such a region does exist in Australia and some of the neighbouring islands. The fauna of that region comprises but few placental forms among its mammals, but a great number and variety of such as have no placenta. There is only one way of accounting for such a fact as this. Before the appearance of the chief representatives of the placental type, that is to say, before the Eocene epoch, the Australian region must have been cut off from the other lands of the globe ; it must thus have been saved from that struggle for existence in which the higher forms of the Eocene epoch took part. Passing on now to the Miocene we find that in that epoch the number of the orders is completed. None of the orders of the present day is wanting in Miocene formations. Monkeys, seals, whales, sea-cows, elephants, and edentates all appear. The families become specialized, the monkeys of the Old and New World, hedgehogs, felines, hyaenas, martensand bears, rhinocerosesand hippopotamuses, as well as ruminants, can be more and more clearly discriminated. In short we see how in the strata of the Miocene the types follow one another in higher and higher degrees of specialization. It is clear, moreover, that those regions which present to our view only the orders appearing first in the Eocene, and which are without the orders originating in the Miocene, were isolated before the latter epoch, though not till after the Eocene. In this position are Madagascar and the Antilles. The great African island is mainly inhabited by prosimians; but there are found in addition bats, insectivores, rodents, a species of pig, viverrines, and the old type Cryptoprocta. No vestiges, how- ever, have yet been found there of any order or family belonging to the Miocene — neither monkeys, nor ruminants, nor edentates, which are all so abundant, nevertheless, both on the mainland of Africa and in India. The Antilles present an analogous case, differing only in the details. The i6 THE MAMMALIA. Miocene orders and families are there unknown; the monkeys, edentates, ruminants, and carnivores, so widely diffused on the neighbouring mainland, are all alike absent here; the bats and rodents, which are found on these islands, belong to an ancient Eocene nobility, and so also do the insecti- vores, which are wholly wanting on the mainland of South America. These two regions have followed a separate course of development, at least since the Eocene period. And here now we are met by another fact. If the Eocene and Miocene genera found on the two hemispheres and described by palaeontologists are compared, we find with astonishment that, with the exception of two genera belonging to the Perisso- dactyla, the genera Coryphodon and Lophiotherium, derived from the earliest Eocene strata, there are none common to both hemispheres. What con- clusion must be deduced from this fact? Assuredly none but this, that the two great divisions of the earth were already separate in those times. But there are in both corresponding series in the evolution of mammalian forms; monkeys, horses, ruminants, and carnivores exhibit parallel series on the two sides of the ocean. In the Pliocene and Quaternary periods the two hemispheres are not so sharply distinguished in the north. In the Quaternary, in which the polar species of the two hemispheres advanced in general further to the south, there is not only, as at present, similarity but entire agreement. These facts made the adoption of a separate circumpolar region necessary. We cannot associate this region with those immediately to the south, when we find that the latter are not only absolutely distinct on the two sides of the ocean at the present day, but were equally distinct to the northern shores of the respective continents down to a period geologically recent. The two parts of the mainland of America are connected by the Isthmus of Panama, by means of which many an interchange has taken place. But on the whole the two land-masses referred to are astonishingly different. North America, the Nearctic region, has neither monkeys, nor manatees, nor tapirs, camels, agoutis, or edentates, like South America, the Neotropical region, which again has neither insectivores, nor hollow-horned ruminants or pouched rats. These two regions are accord- ingly sharply marked off from one another. Quite different is it, however, with the three regions of the Old World. The Palaearctic region has neither edentates, prosimians, nor elephants, which the other two regions possess; but for the most part it is necessary to descend to families and even to genera in order to make out general distinctions between the three regions. We must also grant that their boundaries become obliterated when we go back from the present time to earlier periods. The three regions finally merge entirely into one. In the Miocene and Eocene periods the Palaearctic region had edentates, giraffes, and prosimians, and as late as the Quaternary period elephants, hippo- potamuses, rhinoceroses, and hyaenas. The present limits of the region have accordingly only gradually been established. If we now go on to consider the classification which may be deduced from and ought to sum up all the results of biological, developmental, and geographical investigations, we must confess that considerable impediments stand in the way. First of all we recognize the perfectly clear and sharp distinction between aplacental and placental mam- mals, but after we have got so far we find the principles of a further subdivision, especially of the placental mammals, difficult to determine. The Eocene orders furnish us with nailed and hoofed forms, Deciduata and Indeciduata, forms with diffuse, zonary, and discoidal placentas, with complete and incomplete dentition. All these above- named orders cannot be derived from one another. If, as is very probable, they are all descended from marsupial stocks, they must trace back their descent along several lines of different origin. Let us take for granted for an instant this descent from a marsupial ancestry, and see what conclusions may be deduced therefrom. Such conclusions can be based only on the dental system, which is all that is known to us in the case of the earliest mammals. Presumable Relations of existing Placental Orders to a Marsupial Ancestry as shown by the Dental Characters — The insectivorous type is the oldest. We have seen that the marsupials of the Trias and Oolitic (Jura) periods are insecti- vores. This is accordingly a very old, perhaps even the primitive stock. The bats are only flying insectivores. If we unite the insectivores with webbed feet and those with the toes free, we might also, without being guilty of any great offence, add to the same group those with flying membranes. Some Prosimii are manifestly insectivores. They are probably descended accordingly from insecti- vorous marsupials. Others, however, likewise very INTRODUCTION. old forms, resemble hoofed mammals, especially Artiodactyla, in dentition. Even the placenta bespeaks a close affinity to the latter. Very probably, therefore, our present mode of division unites in a single order animals which are derived from quite different ancestors, but which have approached one another in respect of a number of secondary characters. The same holds good also of the apes and monkeys, which cannot be derived from a single ancestor. On their first appearance in the lower Miocene the Simiae of the New World are as different from those of the Old as they are at the present day. Moreover, there are Simiae which are rather insectivorous in their habits, while others again approach more nearly the carnivorous and omnivorous forms. We should thus have a group of orders, the Chir- optera, Prosimii, and Simiae, which might, at least in part, be placed very near the old Insectivora. Take now the Carnivora. We know even in Jurassic strata marsupials whose dentition ap- proaches the carnivorous type, and from more recent strata, as well as the fauna of the present era, we are acquainted with many, which, if we may so express ourselves, are more carnivorous than the placental carnivores. The Hyaenodons are an unmistakable connecting link. The Carnivora are accordingly descended without doubt from mar- supials. The seals, as we have already mentioned, are only a branch of this group adapted to an aquatic mode of life. The Perissodactyla and Artiodactyla belong to the Eocene nobility. May we perhaps connect them with the Jurassic genus Stereognathus? However that may be, these two orders form, so to speak, trees, whose original trunks, the tapirs and pigs, have continued on to our own day. Both stems have put forth many branches now extinct, which we cannot here enumerate, but the Solidungula and rhinoceroses form series which have developed from the ancient Perissodactyla, the former from those of Eocene, the latter those of Miocene times. Very probably the Pro- boscidea and Sirenia are also to be reckoned to this group. Further, there is probably no doubt as to the fact that the ruminants and hippopotamuses are descended from the first Artiodactyla, the pigs. In these two great orders, also, the marked distinction between the primitive stocks of the Old and the New World is plainly manifest. The rodents of the Eocene nobility cannot be traced with certainty from any marsupial form. Only the genus Plagiaulax, from Jurassic times, ex- hibits certain distant resemblances. The members of this order have remained what they were at first; they have not essentially altered throughout the whole geological period in which they are known. The same is the case with the edentates. This group is manifestly made up of the descendants of several ancestors; but we can only trace them back to the Miocene, and in doing so we cannot discover any unequivocal relations to older types. From all this two main conclusions in our opinion may be drawn. First, that it is a perfectly ground- less hypothesis, that the mammals can all be traced back to a single stock ; and, second, that the various original stocks, which we feel compelled to assume, have developed, in the regions to which they are confined, independently of each other, and often in such a manner that the ultimate forms which they have attained have more resemblance to each other than the types from which they have proceeded. In the body of the present work we have sub- divided the mammals in accordance with the points of view which we have just explained. We follow the series from the most perfect forms, those stand- ing nearest to man, the Simiae, down to the types with the lowest organization. The aplacental forms, the marsupials and monotremes, were obliged to take the last place; and among the placental forms the edentates and rodents un- doubtedly form the lowest steps in the ladder. After the Simiae the orders standing next to the stem-group of the Insectivora, namely the Prosimii and Chiroptera, naturally range themselves in im- mediate succession, and then follow the Carnivora, among which the Pinnipedia (seals) form the transition to the whales, with which again are con- nected the Sirenia and Proboscidea as transitions to the Even-toed Ungulates (Artiodactyla). The table on page 18 exhibits these subdivisions, with their general characters, in the order in which they are treated in the body of the work. 18 THE MAMMALIA. TABLE OF THE ORDERS, FAMILIES, AND TRIBES OF THE MAMMALIA. APES AND MONKEYS (Simice}. Tropical mammals more or less like man, with complete dentition, opposable thumb and great toe (Quad- rumana), cup-shaped closed bony orbit, two pectoral mammae, and discoidal placenta. (A) MONKEYS OF THE OLD WORLD (Catarrhince). With 32 teeth and narrow septum between the nostrils, which are directed somewhat forwards. ANTHROPOID APES (Anthropomorplue). Tailless, with naked face somewhat resembling that of man; body covered with long hairs. BLACK ANTHROPOID APES (Troglodytes). With fore- limbs reaching no further than the ankles, and thirteen pairs of ribs; natives of Africa. RED ANTHROPOID APES (Simla). With very long arms and twelve pairs of ribs ; natives of the East Indies. GIBBONS (Hylobates). Asiatic arboreal apes, with extraordinarily long arms and hands, and small naked spots on the buttocks. TAILED MONKEYS (Caudata). With more or less developed tail, ischial callosities, and mostly also cheek-pouches. SEMNOPITHECI. Arboreal monkeys of slender shape, with well-developed thumbs, long tails, a com- pound stomach of three parts, and sometimes with, sometimes without, cheek-pouches. COLOBI. African forms resembling the Semnopitheci, but with more powerful jaws and much reduced thumb, and without cheek-pouches. GUENONS (Cercopithecus). African monkeys with simple stomach, cheek-pouches, long tail, large thumb, and moderately long limbs. MACAQUES (Macacus). With a solitary exception Asiatic monkeys, with a rather thickset frame, pro- truding muzzle, tolerably powerful jaws, simple stomach, cheek-pouches, and a tail which never grows longer than the whole body. BABOONS ( Cynocephalus). Large, chiefly African, ter- restrial forms, with dog-like muzzle, powerful limbs, and dentition like that of a carnivore. (B) MONKEYS OF THE NEW WORLD (Platyrrhinte). With 36 teeth and broad nasal septum; the nostrils directed sidewards; ischial callosities and cheek-pouches always absent. NAKED-TAILED MONKEYS (Gymnurte). The long and powerful tail has at least the last third naked on the under surface, where it is covered with rough skin; and the tail serves as an organ of touch and prehension. THE HOWLERS (Mycetes). THE WOOLLY MONKEYS (Lagothrix). THE SPIDER MONKEYS (Atcles). THE SAJOUS (Cebida). Tail long and strong, com- pletely covered with hair, and serving only as an organ of prehension (not of touch). THE SAKIS (Aneturce). Tail of various length, the vertebras not increasing in size towards the ex- tremity; never used for prehension. (C) THE CLAWED MONKEYS {Arctopitheci). With 32 teeth, fore-paws without an opposable pollex (thumb), all the digits except the hallux (great toe) provided with claws. THE PROSIMIANS (Prosimii). Climbing animals with complete dentition, opposable thumb and great toe (Quadrumana), bony orbit not closed behind, mostly more than two teats, and with a campanulate (diffuse) placenta. THE PROSIMIANS OF MADAGASCAR. THE LEMURS (Leimiridd). ) Distinguished by their THE INDRIS (fndrisida). i dentition : see text. THE AYE-AYE. A single species forming a family by itself, with a peculiar dentition like that of a rodent, and with a very long middle digit on the fore-foot. THE AFRICAN PROSIMIANS. THE POTTO FAMILY (Pterodictida). A family with small ears, short tail, and rudimentary index. THE GALAGO FAMILY (Galagonida). Composed of a single genus with long ears and tail, digits complete, and all provided with flat nails, except the second digit of the hind foot, which carries a claw. INTRODUCTION. THE EAST INDIAN PROSIMIANS. THE LORIS (Lorisidd). A family resembling the Pottos, with rudimentary index and tail. THE TARSIER. A single species forming a family by itself; distinguished by its enormous eyes and greatly elongated tarsus. THE COLUGOS OR FLYING CATS (Galeopilheais). A highly remarkable genus forming a separate family distinguished by the possession of a pata- gium, or parachute-like membrane, and a very peculiar dentition. THE BATS (Chiroptera). Mammals distinguished by the possession of wings formed by a membrane attached to the body and com- monly also to the hind limbs and tail, and capable of being extended by the remarkably elongated digits of the fore-limbs; complete dentition; two pectoral mammae; discoidal placenta. THE FRUIT-EATING BATS (Carpophagd). FLYING FOXES (Pteropidd). Bats with flattened masticating molars and mostly with a clawed index or second finger; snout long. THE INSECT-EATING BATS (Entomophagd). TRUE BATS OR VESPERTILIONIDA (Gymnorhina). The simple nose at the extremity of the snout without leaf-like appendages. LEAF-NOSED BATS (PkyUostomatd). Bats with mem- branous appendages to the nose, mostly sup- ported by thin plates of cartilage. THE INSECT-EATERS (Insectivord). Small plantigrade mammals with a discoidal placenta and all three kinds of teeth; mostly five-clawed toes on all four feet. THE BANXRINGS OR CLIMBERS (Tupaia), resembling squirrels, with a sharp naked muzzle, and long tufted tail. THE JUMPING SHREWS (Macroscelida). Resembling jerboas, but with a long snout or proboscis; natives of Africa. THE DESMANS OR DIVERS (Myogalidd). With swim- ming feet, long proboscis, and flattened tail. THE SHREWS OR RUNNERS (Soricida). The body resembling that of a mouse, but with a pointed muzzle and short, almost naked, tail. THE CRAWLERS forming two groups: — THE TANRECS (Centetida). Natives of Madagascar, with the general appearance of our hedgehogs. THE HEDGEHOGS (Erinacei). Natives of the conti- nents of the Old World, with the body completely covered with spines. THE BURROWERS. Having the anterior extremities modified into powerful delving instruments; also forming two groups — THE MOLES (Talpidd). The digging feet with five digits. THE GOLDEN MOLES (Chrysochloridd). Moles belonging to the Cape, with a short thickset body, only three digits on the digging feet, and rainbow reflex colours on the fur. THE FLESH-EATERS (Carnivord}. Mammals with zonary placenta, free clawed toes, well- developed canines and more or less cutting molars. THE DOG TRIBE (Canida). Digitigrade carnivores with long running legs, five free toes on the fore-feet, four on the hind-feet, and in most cases 42 teeth. THE DOGS PROPER (Canis). With five toes in front, four behind, and 42 teeth. GROUP OF THE WOLVES. Round pupils. GROUP OF THE FOXES. Vertical oval pupils. THE HYAENAS (Hyanidd). Digitigrade carnivores with powerful body decreasing in size from before back- wards, mostly with four toes on all four feet, and at most 34 teeth. THE CAT TRIBE (Fdida). Digitigrade carnivores mostly with retractile claws and never more than 30 teeth. THE CHEETAHS (Cynailiirus). THE TRUE FELINES (Felis). FELINES OF THE OLD WORLD. FELINES OF THE NEW WORLD. THE LYNXES (Lynx). FOSSA (Cryptoproctd). THE VIVERRINES ( Viverridd). Carnivora of small or at most of moderate size, with short legs, and two permanent molars in each half of each jaw. THE CIVETS (Ailnropoda). Digitigrade viverrines with retractile claws. THE MANGOUSTIS (Cynopedd), Viverrines with elon- gated toes, large non-retractile claws, and naked soles. THE BEARS (Ursidd). Plantigrade carnivores often with a clumsy thickset body, with a degraded and often scarcely recognizable carnassial and large tubercled teeth. THE SMALL BEARS (Subursidd). With 36-40 teeth and a long tail. THE LARGE BEARS (Ursidd). With 42 teeth, in- cluding four premolars above and below, two molars in the upper jaw, three in the lower, all with flat wrinkled crowns, furnished with low blunt tubercles. 2O THE MAMMALIA. THE BADGER AND WEASEL FAMILY (Mustelida). Except a single species all the Carnivora belonging to this family have a single large tubercled tooth in each half of the upper, and two molars in each half of the lower jaw. BADGERS (Mdida). Plantigrade carnivores with thickset clumsy body, short feet, and highly developed anal glands. MARTENS (Martida). Mostly digitigrade, with long and even worm-like body, frequently retractile claws, and usually a long bushy tail; the upper tubercled tooth small and transversely placed, the upper carnassial sharp and with a horizontal process in front. OTTERS (Lutrida). Aquatic Mustelida with long but stout cylindrical body, short webbed feet, and flattened tail. THE SEALS (Pinnipedid). Aquatic carnivores with feet converted into flippers, spindle-shaped body, complete dentition, and zonary placenta. THE EARED SEALS (Otarida). Provided with ex- ternal ears. THE TRUE SEALS (Phocida). Without external ears and with short limbs. THE WALRUS (Trichechus). Armed with tusks. WHALES AND DOLPHINS (Cetacea). Fish-like carnivores without hind-limbs, and having the fore-limbs converted into flippers, the tail in the form of a horizontal fin. The nostrils (blow-holes) are situated on the summit of the forehead; the ill- developed lips have no moustache hairs, the skin is naked, the placenta diffuse, and the teats situated far back in the abdominal region. TOOTHED WHALES (Denticete). DOLPHINS (Ddphinida). With a larger or smaller number of uniform teeth in both jaws; feed ex- clusively on fishes. THE SPERM WHALE FAMILY (Physeteridd). With fully developed teeth only in the lower jaw. WHALE-BONE WHALES (Mysticete). FIN-BACKED WHALES (Balcenoptei'ida). RIGHT WHALES (Balceniila). THE SEA-COWS (Sirenia). Fish-like herbivora without dorsal or ventral fins, with a small head and distinct neck, thick lips set with tactile hairs, molars with broad crowns, nostrils at the end of the muzzle, and pectoral teats. THE ELEPHANTS (Proboscideti). I^arge animals whose nose is prolonged into a proboscis which serves as a prehensile and tactile organ, with column-like legs, and feet with five toes united into a mass and covered with flattened hoofs; the upper incisors mostly in the form of tusks; no canines; compound molars; placenta zonary. THE ODD-TOED UNGULATES (Pcrissodactyla). Hoofed animals mostly of large size, usually with an odd number of toes on both pairs of feet, the middle toe being the one that continues the axis of the leg. The thigh-bone has a third trochanter; denti- tion complete; stomach simple; teats abdominal or inguinal; placenta usually diffuse and composed of separate cotyledons distributed over the whole sur- face of the ovum or embryo. THE ROCK-BADGER FAMILY (Hyracida). With four toes in front, three behind, and certain rodent- like characters in the dentition. THE TAPIR FAMILY (Tapirida). Composed of animals somewhat resembling large pigs, but distinguished by the possession of four hoofed toes in front, three behind, and a short motile proboscis. THE RHINOCEROS FAMILY (Nasicornia). Composed of a single genus of huge clumsy animals, with three toes both in front and behind, one or two formidable horns composed solely of horny matter, and a peculiar dentition. THE HORSE FAMILY (Equitta). A family repre- sented at the present day by only a single well- marked genus, with shapely body, long slender legs terminating in only a single digit (the middle one), but comprising also a number of extinct forms with a greater number of digits both on the fore- and hind-feet. THE EVEN-TOED UNGULATES (Artiodactyld). Hoofed animals of very variable size, almost always with an even number of toes, which are arranged about two parallel axes running through the middle line of the second and fourth digits. The thigh-bone has no third trochanter. The stomach shows a tendency to subdivision. The originally complete dentition gets gradually specialized and reduced. The teats are abdominal and inguinal; placenta diffuse. NON-RUMINANT ARTIODACTYLA (Polydactyla). With more than two digits. THE HIPPOPOTAMUS OR RIVER-HORSE FAMILY (Obesa). Composed of the single genus Hippopotamus, consisting of huge clumsy animals, with very thick hides, four toes both on the fore- and hind-feet, and a highly remarkable dentition. THE PIG FAMILY (Sttida). With large and thick but tapering head terminating in a snout, the end INTRODUCTION. 21 of which is in the form of a tough round disk, and in all cases, except the peccaries, having the canines of the upper jaw directed upwards. THE RUMINANTS (Didactyla or Ruminantia). With only two digits, and with a complex stomach adapted to the process of chewing the cud. THE CHEVROTAIN FAMILY (Tragitlidd). With meta- carpal and metatarsal bones not completely fused into a cannon bone, with a low structure of brain, and without a psalterium in the complex stomach. THE DEER FAMILY (Cervidd). The males (and in the reindeer the females also) with horns in the form of antlers. THE HOLLOW- HORNED RUMINANTS (Cavicornia). Horns composed of horny matter with a hollow core in which rise bony processes from the skull. THE ANTELOPES. THE GOATS. THE IBEX. THE SHEEP. THE Ox FAMILY. THE BUFFALO. THE BISON. THE TRUE OXEN. THE GIRAFFE FAMILY (Devexd). Composed of a single species, with very long neck, high shoulders, long flexible tongue, and hair-clad horns in the form of bony out-growths from the front margin of the occipital bone. THE CAMEL FAMILY (Cameliila). With feet resting on callous pads, and, unlike other ruminants, with incisors in the upper jaw, besides other peculiarities in the dentition. THE CAMELS. THE LLAMAS. THE GNAWERS OR RODENTS (Rodentid). Claw-bearing mammals with incomplete dentition, having only two large rootless functional incisors in the upper and lower jaw, no canines, and cheek-teeth almost uniform, arranged in a continuous series and separated from the incisors by a wide dia- stema. Placenta discoidal. THE SQUIRREL FAMILY (Scittrida). With a strong clavicle, four free digits on the fore-feet and three on the hind-feet, all armed with strong claws, and with a peculiar dentition (usually five molars in the upper jaw, and all the molars with triangular crowns). THE SQUIRRELS. THE MARMOTS. THE DORMOUSE FAMILY (Myoxidd). Distinguished from the previous family chiefly by the dentition (only four molars in the upper as well as in the under jaw, and all the molars with transverse plates of enamel). THE BEAVER FAMILY. A family consisting only of a single species (Castor fiber), of considerable size, with five toes both on the fore and hind feet, those on the hind feet united by a web. THE MOUSE FAMILY (Muridd). A family composed of a great variety of forms, presenting numerous transition links, with clavicles, usually four digits and the rudiment of a pollex on the fore-feet and five digits on the hind-feet, and usually only three molars. MOLE-RATS. HAMSTERS. RATS AND MICE. FIELD MICE. THE JERBOA FAMILY (Dipodidd). Distinguished by their very long hind-legs adapted for jumping, the excessive length being due to the great elongation both of the tibia and the metatarsus. THE PORCUPINE FAMILY (Hystrieidd). Distinguished by their covering of spines on the back, serving as a defensive armour. THE SPINY RAT FAMILY (Echimyidd). With four molars with enamel folds, sometimes simple, some- times complex, the fur generally coarse and some- times interspersed with spines. THE DEGU FAMILY (Octodontidd). With the enamel folds on the grinding surface of the molars arranged in the form of the figure 8. THE CHINCHILLA FAMILY (Chinchillidd). Distin- guished by the possession of four rootless molars divided into two, or at most three, separate trans- verse ridges by continuous folds of enamel. THE AGOUTI FAMILY (Subungulatd). Distinguished by the peculiar structure of the digits, which carry a kind of hoof in place of claws or nails. THE RABBIT FAMILY (Leporidd). Distinguished by the possession of two small incisors in the upper jaw, placed behind the two functional incisors. THE EDENTATES (Edentata). Placental mammals with incomplete dentition and root- less teeth without enamel. The free digits carry hoofs transformed into sickle-shaped claws. THE SLOTHS (Bradypoda). With very long fore-limbs, incomplete zygomatic arch, and descending process from the cheek-bone. THE ARMADILLOS (Dasypodd). With a very strong bony framework, part of which is adapted to support an outer skeleton or armour, composed of small plates, usually hexagonal in form, placed side by side. 22 THE MAMMALIA. THE WORM-TONGUED EDENTATES (Vermilinguia). Dis- tinguished by the possession of long worm-like tongues, always coated with an adhesive saliva, which enables them to be used as organs of pre- hension. THE ANT-EATERS. THE PANGOLINS. THE MARSUPIALS or POUCH-BEARING MAMMALS (Marsupialia}. Non-placental mammals with free digits bearing nails or claws. The young are born in a very imperfect condition, and complete their development attached to teats situated in an external abdominal pouch (marsupium) supported by two special bones (mar- supial bones) attached to the pelvis. The dentition is usually complete but permanent, except in the case of a single premolar, which is shed and renewed. The lower angle of the lower jaw behind is turned inwards. THE OPOSSUMS (Didelphyida). With five digits on all four feet, and with a very long and strong hallux, which is completely opposable as in monkeys. THE PREDACEOUS MARSUPIALS (Rapacia). THE PERAMELES FAMILY (Peramelida). Long-eared marsupials with tubercles on the molar teeth, ada'pting them for crushing insects, the first digit of the fore-feet represented only by a wart or tubercle, that of the hind-feet entirely absent, while the second and third digits in the hind- feet are very thin and united together down to the claws. THE DASYURE FAMILY (Dasyurida). With a more or less well-marked carnivorous dentition. THE FRUIT-EATING MARSUPIALS (Carpophaga). THE PHALANGER FAMILY (Phalangistida). With the second and third digits of the hind-feet united, a nailless opposable hallux, and well-developed marsupial pouch. THE HERBIVOROUS MARSUPIALS (Poephaga). Com- posed of forms well adapted for leaping; always with five digits, armed with strong claws on the short fore-limbs, and very long hind-limbs fitted to bear the whole weight of the body. THE ROOT-EATING MARSUPIALS (Rhizophaga). Com- posed only of a single genus, the wombats (Phascolomys), with a dentition exactly like that of a rodent. THE MONOTREMES (Monotrematd). Non-placental mammals without true teeth, with the genital and urinary ducts opening along with the rectum into a common chamber (cloaca). They have neither marsupial pouch nor teats, but have milk-glands and marsupial bones. THE ORNITHORHYNCHUS. THE ECHIDNA. NOTE ON POINTS CONNECTED WITH GEOLOGY REFERRED TO IN THIS WORK. In the following pages a section under each order of the Mammals is devoted to the question of the presumed origin or descent of the group, which involves the consideration of its distribution in time. With the view of assisting the reader in following the reasonings in the sections alluded to, a geological table showing the sequence of the rocks forming the crust of the earth is here added. Where subordinate members of the systems given in this table are mentioned in the text, such sub-divisions, for example, as the Keuper or New Red Marl, or local formations, like the Stonesfield Slates, or the Purbeck Beds, an indication is always given of the system to which they belong, so that a reference to this table will enable the reader to understand in a general way the relative order in time of the extinct forms spoken of. It may here be mentioned, however, that the order of the strata, as shown in this table, must not be understood as giving any indication of the length of time separating forms belonging to differ- ent systems. The thickness of the rocks composing these systems varies greatly, and there is presum- ably a corresponding variation in the length of time that has elapsed during their formation. Thus, though the first Mammalian remains are found in the Trias, it may be inferred from the thickness of the British strata, that the interval between their INTRODUCTION. first occurrence and the present epoch, is enor- mously less than that which had previously elapsed from the time of the oldest stratified rocks. It need hardly be observed that in the following I table, as in all similar tables, the oldest strata are those which are placed at the bottom. The Archaean or Eozoic rocks contain the earliest organic remains known to exist, and such remains become more and more numerous as we ascend the scale. It is in accordance with the general character of these remains that the rocks are subdivided into the systems mentioned in the table, but it is not till we come to the rocks classed as " Recent " that we meet with any subdivision based on the char- acter of the Mammalian remains. The rocks or deposits so termed are distinguished from the Pleistocene, or those forming the other member of the Quaternary series, by the fact that in them all the mammals belong to species still living, while the latter contain the fossil remains of many ex- tinct mammals, as well as others derived from forms surviving at the present day. GEOLOGICAL TABLE, SHOWING IN ASCENDING ORDER THE MAIN ROCK-SYSTEMS INTO WHICH THE CRUST OF THE EARTH IS DIVIDED. POST-TERTIARY OR QUATERNARY { Recent — Alluvium, Peat, &c. Pleistocene. / Pliocene. TERTIARY OR KAINOZOIC, < Miocene. \ Eocene. , Cretaceous. SECONDARY OR MESOZOIC PRIMARY OR PAL/EOZOIC, ARCHAEAN OR Eozoic, I Oolitic. , < Jurassic. > j • • ' Triassi Triassic. Permian. Carboniferous. Devonian and Old Red Sandstone. Silurian. Cambrian. Fundamental Gneiss. APES AND MONKEYS (SIMI.E). Tropical mammals more or less like man, with complete dentition, opposable thumb and great-toe (Quadrumana), cup-shaped closed bony orbit, two pectoral mammae, and discoidal placenta. TH E apes and monkeys must always have struck men as being exceedingly human- like in their general form and structure. So much so, that the great medical writer Galen, as was demonstrated by Vesalius, ascribed to the human frame several details of structure that he could only have observed in dissect- ing the well-known magot or Barbary Ape: Linnaeus, again, the founder of modern zoology, placed the orang-utang in the same genus with man, distinguishing them merely as species. Modern science, however, renders this error no longer possible. There has been more controversy over the question of the relation of man to the Simise than would have been possible if the dis- putants had limited themselves to purely zoological characters, and had not drawn into the discussion the whole sphere of man's intellectual development and capacity for development. If our object were to give a complete account of the whole class of the Mammalia, as that class must be understood in the science of zoology, unquestionably we should have been compelled to include man, who is a mammal, neither more nor less, down to the smallest feature of his internal and external organization. That is a truth that cannot be shaken. But since, even apart from intellectual qualities and their develop- ment, the study of man as a part of nature has become the subject of a comprehensive science, Anthropology, we have had to con- fine ourselves to the other mammals. Here now it is a matter of perfect indifference for our present purpose what relative value one would assign to the specific characters of the bodily structure of man ; for even although one must acknowledge the entire truth of the well-known saying, that there is less difference between man and the anthropoid apes than between these and the lowest of the Simiae, yet within these limits various views may be maintained as to the value of the boundary lines between the different groups. The likeness of the Simise to man is un- disputed, but it is not the same in all members of that group. It grows gradually less from the large anthropoid apes down to the baboons and the Arctopitheci ; and if the members of one group manifest a striking resemblance in the general form of the body, in their bearing and mode of using the limbs, those of the last group approach so near the squirrels and other climbing animals orCarnivora in external appearance, demeanour, and mode of life, that it requires a pretty close examination to ascertain the differences between these groups. Let us take a closer look at the bodily resemblances and differences, for it is only 26 APES AND MONKEYS. these that come under consideration here in the first instance. The resemblances are more prominent in the young, the differences in the adult. I was drawing a mature embryo of the black ape (Cynocephalus (Cynopithccus) niger), when a lady, who had shortly before pre- sented her husband with a son, stepped in. "Good gracious!" she exclaimed, "exactly the portrait of my little Jean Jacques." The rounded head with generally flat nose and nostrils placed very near each other, the well-formed neck, the form of the trunk, and above all the entire freedom of the limbs mark the external resemblance to man, a resemblance, however, which is, to be sure, a good deal diminished in most of the Simiae by the existence of a longer or shorter tail. But we hasten to add that in the anthropoid apes and some other species, as the Barbary ape, this appendage is altogether wanting. A less striking difference is presented by the covering of hair, which in most of the Simiae is complete, and in some even forms a kind of woolly fur. This distinction cannot indeed be called an absolute one, for between the scanty hair-covering of some of the Simiae and the abundant hair-covering of many races of man it is just as impossible to draw a sharp boundary line as it is to indicate any such line of demarcation with respect to the distribution and direction of the hair on certain parts of the body. In man the front of the body is much more hairy than the back, which must probably be regarded as a consequence of the usual attitude of man, since it is always those parts which are most in need of protection that are most abun- dantly covered with hair. The ape or monkey, which holds itself erect only in exceptional cases, exposes the back parts to the changes of the weather, and these accord- ingly are the more plentifully covered with hair; the naked savage, on the other hand, standing erect exposes the crown of the head and the front more than any other parts, and hence has these parts most abundantly supplied with hair. With respect to the direction of the hair the anthropoid apes agree with man in having the hair on the fore-arm directed backwards towards the elbow, while the other Simise and other mam- mals generally have the hair on the corres- ponding parts directed downwards. Let us now consider more closely the structure of the skeleton, and first that of the skull. The skull of the very young in all mam- mals including man is characterized by the predominance of the cranial over the facial region, the latter of which has its form and proportions determined chiefly by the de- velopment of the jaws. In man as in the Simiae the jaws grow gradually forwards with advancing years in consequence of the growth of the teeth ; but while even in those races of man which have teeth slanting forwards (the Prognathi) this protrusion is confined within narrow limits, in the Simiae, and especially in the low terrestrial forms, the Cynomorphae, it is so considerable that we have here similar relations to what we find in the Carnivora, the cranial region lying for the most part not above but behind the facial. But in this as in many other cases the gradual development of this feature can be considered under three aspects, namely, as affected by age, by sex, and by the position in the scale of being. In the female sex the jaws and the muscles moving them are less de- veloped than in the male; in the higher Simiae the jaws protrude less than in the lower. With the development of the jaws and their muscles is connected in the most intimate manner that of the surfaces, crests, and ridges of the skull to which the muscles are attached; and considering the development of these crests and ridges under the three aspects just mentioned, we may observe that in the young and in females they are often scarcely more prominent than in man while in the males of many species they are not less developed than in the heavy-armed Carnivora. STRUCTURE OF THE SKULL. 27 In all circumstances, however, the cranial region in the Simise is, in consequence of the smaller size of the brain, much smaller than in man, and we are justified in saying that the most essential distinction between the two groups consists in peculiarities which result from this predominant development of the human brain. While in man the osseous brain-case with its contents arches over the facial region in such a manner that the latter comes to lie almost entirely under and not in front of the former, the centre of gravity of the skull and of the whole head is at the same time trans- posed forwards, so as to have the effect of making the upright position the normal attitude of the body. In those Simiae which most closely resemble the lower animals as regards the structure of the jaws, namely, the baboons, the head, as in all other four-footed mammals, is attached by strong muscles and nuchal ligaments, so that its support always demands a considerable degree of muscular exertion, in consequence of which the pro- cesses of the neck vertebrae to which the nuchal ligaments are attached are correspond- ingly elongated and strengthened. In man, on the other hand, the head is in a state of equilibrium on the spinal column when he stands erect, and no further muscular exertion is required to keep it in that position. These relations necessarily affect the position of the occipital articulation, and the opening or foramen between the two occipital condyles through which the spinal column is prolonged into the cranial cavity so as to become con- tinuous with the brain-mass. From the posterior surface of the skull, where this foramen is found in the lower Simiae, it moves gradually down in the higher species till at last it comes to occupy in man the middle of the base of the skull. Anatomists are now agreed upon this, that the brain of the Simiae is constructed exactly on the same plan as that of man, that no part is wanting to the former which is present in the latter; that the fissures which intersect the brain-mass and the lobes and convolutions lying between them are absolutely identical, and are distinguished only in this, that their forms become in man all the more complicated the larger the mass becomes, besides which the greater or smaller relative importance of individual lobes and fissures must also be taken into account. But in this case also the gradual development, both from infancy to the adult condition, and also from race to race or species to species, can be demonstrated, and the observation that the structural dif- ferences between the brain of the anthropoid apes and that of the lowest races of man are much less than those which we meet with in descending from the higher to the lower Simiae, can no longer be shaken. The weight and volume of the brain of the adult gorilla, the largest of the anthropoid apes, only slightly exceed those of the brain of the new-born (human) child. If only this circum- stance be taken into consideration, other finer specific differences being left out of account, then we. may have some warrant for saying, that the brain of the anthropoid apes only when fully grown attains that degree of de- velopment which the brain of the child pos- sesses on its entrance into the world. No doubt, however, the anthropoid type of brain structure is shown also in this, that in all the Simiee, even the lowest, the cerebral hemispheres are sufficiently developed to overarch all the other parts, corpora quadri- gemina and cerebellum, in such a manner that when the brain is seen from above these are completely covered. The three higher organs of sense, eye, nose, and ear, are formed and situated exactly as in the human child. The eyes are placed near one another, separated only by a narrow nasal ridge, and are set in completely closed capsu- lar orbits in the front of the face. The nose is flat as in the child, not prominent, the nos- trils in some cases directed more sidewards than forwards, more so than even in the 28 APES AND MONKEYS. lowest races of man, but sometimes they are placed closer together. The ears in the an- thropoid apes exactly resemble those of man, and in them too are similarly incapable of motion, while in the lower Simise they become somewhat more pointed and to a certain degree capable of being moved. The outer margin of the ear (the helix) is rolled in as in man, and only the inferior lobe is less developed and less clearly marked off. The jaws and dentition demand a closer examination. Since these are in general more powerfully developed than in man, the maxillae and gums are proportionally longer and narrower, more elliptical than circular in form, the lower jaw mostly higher than in man, but its two halves always, as in man, completely fused. I mention this character here expressly because it forms an essential distinction between the Simiae and the Prosimii, in which latter the two halves of the lower jaw are connected in such a manner that they can easily be separated. A projecting chin, what is called in more technical language a mental process, is alto- gether wanting in the Simise; but this feature even in human jaws, and especially in childhood, is often only slightly developed. The premaxilla, which carries the upper incisors, becomes fused in man very early, even during embryonic existence, with the adjoining bones, while in the Simiae, on the other hand, the fusion takes place later, mostly at the time of the emergence of the permanent molars. If we now consider the dentition itself, the first thing that strikes us is that in all the Simiae, but especially in males and in those genera which incline to the carnivorous type, the canines rise with their crowns above the masticating surface of the other teeth and fit into a more or less developed gap or diastema in the opposite set of teeth. All the other teeth lie close together with their crowns on the same level. In man large canines occur but seldom. As already mentioned in the Introduction, the milk dentition demands special consider- ation, inasmuch as this represents the inheri- tance which the creature has derived from its ancestors. With respect to the milk dentition the Simiae are divided into two great groups. All the Old World Simiae have twenty milk teeth, like man, namely, two incisors, one canine, and two premolars in each half of each jaw. All the New World forms, on the other hand, have twenty-four milk teeth, there being in them an additional premolar with the same incisors and canines. Through the development of the permanent dentition there arises a division among the New World forms, for while in all except the Clawed Monkeys, or Arctopitheci, three molars emerge in each half of each jaw, in these there are only two, the so-called wisdom-tooth, the last in the series, never appearing in them. We thus obtain the following dental formu- las:— MILK DENTITION. Man World and Old I d Simla;, j INCISORS. CANINES. PREMOLARS. TOTAL. New World Simiae, I ^ 1 2 Arctopitheci, 4 2 2 J_ 3 £ 3 = 20 24 = 24 Man and Old World Simla:, PERMANENT DENTITION. INCISORS. CAN NES. PREMOLARS. MOLARS. TOTAL. 2 3 32 New Simla;, 1 1 2^. — — .1 , I 2 2 3 v World 1 _2_ _ _3_ _3_ 6 imia", ) 2 33 ( 2 Arctopitheci, < ±., Although, then, the Arctopitheci have exactly the same number of teeth as the Old World Simiae and man, yet they belong to the general American type in that they differ from these, as all the other American forms do, in the number of their premolars. The fundamental structure of the teeth is exactly the same as in man. The incisors STRUCTURE OF THE TEETH. are inserted somewhat obliquely as in the prognathous races of man, are broad and chisel-shaped, and have single roots. The canines are conical, sometimes curved and with sharp edges; the premolars with blunt tubercles; the molars four-sided, with at least four blunt tubercles separated by a trans- verse furrow, and sometimes in addition a fifth posterior unpaired tubercle. The dif- ferences are due to greater or less variations in the relative size of the individual teeth, as well as in the structure of the different parts; in particular to the exceptional development of the canines and the somewhat sharper cusps of the premolars in the baboons, to the more pointed form assumed by the molar tubercles in the Arctopitheci, which feed chiefly on insects. The range of these varia- tions is, however, only very small, and one may say in general, that the dentition of the Simiae, like that of man, exhibits a somewhat indifferent character, but is most closely allied to that of the tuberculate group of the Ungulata, more especially that of many fossil genera of this group, yet with indications of an approximation to the insectivorous type of dentition on the one side, and to that of the carnivores on the other. With respect to the structure of the vertebral column, the chest, the shoulder-girdle, and the pelvis, we only observe, without desiring to go into too great detail, that a wide cleft can be shown to exist between the anthropoid apes, which nearly approach the human struc- ture adapted for an upright position, and the other Simiae, in which the arrangement of parts characteristic of four-footed mammals prevails, although with a gradual approach to the type of the anthropoid apes. The verte- bral column shows only approximations to that double S-shaped curve, which is so char- acteristic of man, and which in an upright posi- tion distributes the weight of the body over a greater area. The chest in the terrestrial monkeys as in other four-footed mammals is laterally compressed, and the sternum projects to a certain extent in a wedge-form in the middle line; and only gradually is the broad flattened form of chest such as is seen in the anthropoid apes and in man developed. The shoulder-girdle is always composed of a broad scapula or shoulder-blade and a powerful collar-bone, such as is met with in all mammals in which the fore-limbs serve not only to support the body, but also to perform other functions, such as digging, flying, swim- ming, grasping, and so forth. The pelvis, which is narrow and placed parallel to the vertebral column in the lowest Simise, becomes gradually broader and more basin-shaped, and in the anthropoid apes closely approaches in structure the human pelvis, which, in conse- quence of the upright position, has to support the whole weight of the abdominal viscera. We now turn to the limbs, which indeed are constructed entirely on the human type, but yet exhibit many differences. First of all it may be observed that the fore-limbs are in every case longer and more muscular relatively to the hind ones than in man, who has com- paratively the strongest and longest legs of all animals, as is only natural when we consider that in him the upright position is normal, and the legs consequently have to bear the whole weight of the body. The relative proportions of the two pairs of limbs exhibit a gradual diminution in the amount of difference. From the monstrously long arms of the gibbons and the spider-monkeys a continuous process of shortening can be observed, especially in the anthropoid apes, until we come to man; yet even the arms of the gorilla, the ape that in this respect approaches most nearly to man, are still considerably longer than in the human species. The shorter legs of the Simiae are less muscular; the thighs are flat, the buttocks angular, and there are no calves. But the number and relations of the bones are the same as in man, and moreover the Simiae have the same power of pronation in the fore- arm as man, though not so highly developed. The digits require a more thorough con- APES AND MONKEYS. sideration. With the exception of the Arcto- pitheci the digits in all Simiae have flat nails, which, however, in some species become more arched, and so pass into claws. We are justified in saying that the Simiae have four hands, while man has only two. In the former, as in all climbing animals, the hind-limbs are developed chiefly as grasping organs, in man only the fore-limbs. This essential difference goes so far that the Colobi in the Old World and the spider-monkeys (Ateles) in the New have no thumbs at all, accordingly no hands in the ordinary sense, and the Arctopitheci have indeed a thumb but not an opposable one. All this is true enough, but when we go to the bottom of the matter, these seemingly far-reaching distinctions become shorn of much of their importance. In relation to function, indeed, they could not be greater than they are. In man the hind-limbs are only organs of support and locomotion, the fore-limbs solely of prehension and touch. In the Simiae these functions separated in man are distri- buted among all the four limbs. Nevertheless, except as regards the motions of hallux and pollex, the structure of the two extremities is the same in the Simiae as in man. The hinder extremity of the former is a foot adapted for grasping indeed, yet entirely similar in its structure to the foot of man. The human foot is distinguished from the hand chiefly by the shortness of the toes, the development of the heel and structure of the ankle generally, and the position of the foot with reference to the leg. The leg stands perpendicularly over the ankle, which has developed a posterior process, the heel. The hand is continuous in direction with the fore- arm, and has no heel; the articular surface which connects it with the arm is not found as in the foot on the back but at the end turned towards the body. In all these respects the hind-foot in the Simiae resembles the human foot. There is always a projecting heel, and therefore an ape's or monkey's foot can no more be brought into the same line with the leg than the human foot can; the two must always form an angle with one another. The posterior "hand" of the Simiae can never accordingly be compared anatomically with the human hand, but only with the human foot. Its ankle is identical in structure with that of a man, so much so that in the gorilla only very insignificant differences can be detected. The hand proper in the Simiae, on the contrary, is constructed exactly like that of man, and even the absence of the thumb in many forms constitutes no essential difference. And this nasty tail ! Much paper would have remained unsoiled if the authors of certain controversial writings had known that the anthropoid apes have no tail, but on the contrary have a vertebral column terminating exactly as in man. But it would appear that in many circles it is impossible even to think of a monkey without a tail, and that involuntarily Cercopitheci and Semnopitheci are taken as the sole representatives of an order in which this appendage to the vertebral column undergoes all possible modifications, from the prehensile and tactile organ of the howling monkeys to the rudiment at the end of the vertebral column of the anthropoid apes. With respect to internal organs only a few differences, and these not general, can be pointed out, such, for example, as cheek- pouches, bladder or drum-like organs for increasing the loudness of the voice, the constricted stomach in the Semnopitheci, and similar peculiarities which are not of much account. The human type is prominent everywhere, and quite peculiarly so in what belongs to the reproductive organs. The Simiae never have more than two pectoral mammae; the envelopes of the ovum are exactly of the same nature as in man, and the placenta, like the human one, is discoidal, in many cases simple, but in others divided by a fissure into two lobes. THEIR FOOD AND HABITS. All the anatomical facts may accordingly be summed up thus, that the characters which distinguish the Simise from man may indeed be regarded as sufficient to found a separate order, but that that is the utmost value they have. The simian characters considered as a whole present a curious mixture, inasmuch as some of them correspond to those of the human child and remain at this stage, while others show a development of certain pecu- liarities beyond the point arrived at in man. The head of a male gorilla with its enormous teeth, muscle-tendons, and ridges, on the one hand, and the child's brain within it, on the other hand, affords the best illustration of this assertion. All the Simise are originally arboreal, and many of them never come to the ground in a state of freedom. In climbing they are ex- tremely adroit and powerful, the most expert gymnasts, accomplishing the most astonishing leaps with safety and rapidity. But some come to the ground occasionally, others prefer to spend a part of their life there, and others again scarcely ever leave the ground, but climb about among the rocks in the mountains. These particulars are so far interesting in that they represent a gradual transition to the erect attitude of man. Except the anthropoid apes all the Simiae set the soles of their hind- feet flat upon the ground in walking, and most of them also those of the fore-feet. On the other hand, the long-armed spider-monkeys (Ateles), when they do walk at all, which is quite the exception, turn the hands in in such a manner that the edge corresponding to the little finger touches the ground. The anthro- poid apes place their hind-feet on the ground in an exactly similar manner, while they fold up their hands so as to support themselves on their knuckles. The members of the genus Troglodytes (the chimpanzee and the gorilla), however, frequently walk long distances upright, placing the hind -feet flat on the ground, and it is known regarding the gorilla that in so doing he always keeps his arms free for fighting. The very long-armed gibbons, in the rare instances in which they come to the ground, walk upright, rocking from side to side, while they hold up their long arms in the air so as to balance them- selves. The upright position, always, how- ever, with a bent back, can thus be assumed by the anthropoid apes, but not for very long distances, and in connection with that it is a noteworthy fact that they give their hands and feet that position which is seen in a new-born child — the fingers bent in and the soles of the feet turned in so that the outer edge would touch the ground. The food of the Simise is very varied, but lor the most part mixed. Only very few of them are pure vegetable feeders, these living chiefly on fruits or even juicy leaves. Most of them require a larger or smaller addition of animal food — Articulata and their larvae, the larger species even eating reptiles, birds, and small mammals. Some, such as the Arcto- pitheci, appear to be wholly insect-eaters. In keeping these animals in captivity far too little attention has been paid to this circumstance. Still more manifold are their mode of life, habits, temperament, and mental capacities. Most species live in societies, often indeed in large troops and herds subject to one of the older animals as a leader; some, such as the large anthropoid apes, have been met with only in small families — male, female, and child. Most of the Simiae of the Old World are highly intelligent, extremely curious, given to all sorts of tricks, and like children liable to pass with extreme rapidity from a cheerful to a dull or angry mood; while the American forms, on the other hand, seem as a rule more given to brooding, and are less sensitive and slower in their movements. Even in early years, for it is only young specimens on which it has been possible so far to make continued observations in Europe, the anthro- poid apes exhibit a certain dignity in their bearing, while the baboons are intractable, sullen, and mostly ill-natured creatures. But APES AND MONKEYS. here also, as in the case of children, to whose general behaviour that of the apes has at least some resemblance, great individual differences in capacity and temperament are observable, so that the accounts of the behaviour of individuals of the same species are often diametrically opposite, one observer describing a species as ill-natured and having vices of all kinds, while another finds it amiable and good-natured. And further, in reading all these accounts we must take into consideration the fact that most of the observations have been made on captive specimens, which in consequence of training, constant teasing, and deprivation of their freedom, find themselves in altogether abnormal states of mind and feeling, states which often diverge greatly from those manifested when they are living in freedom. This circumstance also is specially worthy of note, that as in the bodily so also in the mental development of the apes the period of sexual maturity forms an important crisis. It is only at this period that those changes take place which lead to the characteristic formation of jaws and teeth, and of the strong muscle tendons and crests on the skull, and with the appearance of these external features is connected in the most intimate manner the development of the evil instincts, savage- ness, lasciviousness, and so forth, while at the same time the intellectual qualities remain at the same stage which they had hitherto reached. From this period the appetite for food and the sexual instinct govern the animal almost exclusively. Similar conditions manifest themselves in the lower races of man, though not in so pronounced a manner. (A) THE MONKEYS OF THE OLD WORLD (CATARRHIN^E). With 32 teeth, and narrow septum between the nostrils, which are directed somewhat forwards. ANTHROPOID APES (ANTH ROPOMORPI^E). Tailless, with naked face somewhat resembling that of man ; body covered with long hairs. Black Anthropoid Apes (Troglodytes). With fore-limbs reaching no further than the ankles, and thirteen pairs of ribs; natives of Africa. As early as the year 500 B.C. Hanno, the Carthaginian admiral, who then sailed along the west coast of Africa to beyond Sierra Leone at the head of a fleet of sixty vessels, became acquainted with large black anthropoid apes. Three females were killed and their skins brought to Carthage. The interpreters he said, called these apes " Gorillas," a name no longer met with in the negro dialects. Later on people became better acquainted with these apes through the settlements formed on the Guinea coast, and as far back as two hundred years ago living specimens of the young were brought to Europe. But it was not till 1846 or 1847 that it was definitely ascertained that two species of these apes could be distinguished, a smaller species now known as the chimpanzee, and a larger to which the name of gorilla is now restricted ; and while it was formerly believed that only the coast regions were inhabited by these animals, the accounts brought by the more recent explorers of Central Africa seem to leave no doubt regarding the fact that the To face fafe 32. PLATE I. — THE CHIMPANZEE ( Troglodytes niger). UNIVERSITY OF BLACK ANTHROPOID APES. 33 whole of the interior of the Dark Continent is occupied by large apes of this description. Whether a third species, the chego, must be admitted or not is still doubtful. The individual differences among these apes are often very considerable, and hybrids are cer- tainly not impossible, in fact according to the accounts of hunters are even frequent. It is a very difficult matter to obtain reliable information concerning the distribution, spe- cific characters, habits, and mode of life of these remarkable apes, which unquestionably approach nearest to man in their organization. If even white hunters are notorious for their magniloquent exaggerations, and the hunting tales of Europe are held in light esteem as regards the matter of truth, this is much more the case with negroes and many travellers. Competent trustworthy observers have made the acquaintance of these animals only in the young state, and in addition to that only in captivity. All the anthropoid apes brought to Europe have died in childhood. In no case can we be sure that the creature had attained the eighth year of its age. Like the bodily structure so also must the qualities of the animals alter considerably in the adult; but of the adults we know nothing but the dead bodies, together with a number of stories distorted by all sorts of fables. In fact there is only a single white man who has boasted of having himself killed an ape of this kind, and he has been convicted of so much exag- geration and indulgence in the fabulous that his whole narrative has come to be looked upon as very improbable. In the full-page illustration (Plate I.) the Chimpanzee ( Troglodytes niger) is represented in a pleasant homely family group. The papa clings with his right hand and left foot to shoots from a dependent branch, the mamma sits on the outlook with her little one on her lap. Papa is quenching his thirst, and in doing so rests upon his left hand, which is bent into the position which the habit of walking on all-fours has caused the creature to adopt. The bristly hair of the head, long behind, and the short white beard leave the characteristic features of the old male, the very prominent orbits in which the eyes are deeply sunk, and the longitudinal crest on the skull (the sagittal crest), plainly recognizable ; traits which in the female and the young are not well developed. The large ears spread far out from the head; the nose is broad and flattened, the lower part of the face pro- jecting and muzzle-like. The large lower lip is specially characteristic in the chim- panzee, who uses it as a pouch, while either alone or in conjunction with the upper lip it bears a most important part in the play of feature with which the creature expresses its feelings. The naked parts of the face along with the ears are of a dirty flesh-colour inclining to brown, the region of the eyes and the bridge of the nose almost black, the edges of the lips flesh-coloured, the naked hands and feet of a rather dirty- looking black, the long thin fur, which on the back of the head is developed into a kind of tuft, and on the sides of the face forms bristly whiskers, quite black. On the fore-arms the hair, as in all anthropoid apes, is directed towards the elbow ; the tufts of white hair on the buttocks are not seen in our drawing. Hands and feet are quite human in their character; only on the hands the thumb is weaker, while the great toe is stronger than in man, and the latter lies apart from the rest of the toes, causing the foot to be relatively broader than the human foot in front. The female, and still more the young animal, are distinguished from the adult male by the rounder form of the head, which more resembles that of man in shape, but even in the infant chimpanzee the muzzle projects much further than in the lowest human races. Old males of the chimpanzee attain a height of nearly five feet, but com- pared with man have a greater breadth across the shoulders and more powerfully developed muscles in the long fore-arms, which, when the creature stands upright, nearly reach the 34 THE MONKEYS OF THE OLD WORLD. ankles, while the legs are shorter and less fleshy than in man, the muscles of the buttocks and the calves of the legs in particular being very poorly developed. Of the life of these creatures in a state of freedom we know very little. In the Guinea country the chimpanzee prefers the dry some- what open woods, with patches of grass-land here and there, to the dense primeval forest which he inhabits in the interior of the con- tinent. There families, consisting of father, mother, and child, roam about in search of their food, which consists of fruits, juicy leaves, and roots. Sometimes the families unite in troops, among which it is said a good deal of merriment prevails, the members of the troops amusing themselves with games and wrestling, screaming, drumming on hollow trees, and feasting on fruits. Beyond doubt young birds and small mammals are also eaten at these festivals; but all young chimpanzees, which have been kept in great numbers in Europe, exhibit a truly amusing dread of lizards, and still more of serpents. All observers are agreed upon this, that the chimpanzee builds for itself a very simple nest or rather seat in the fork of branches in high trees, employing for the purpose small branches and withered foliage. Sometimes these seats or nests are even provided with roofs as a protection against the rain. On these he spends the night, and there the female lies after having given birth to her young. All are agreed further that the creature displays great dexterity in climb- ing, and that he flees before the face of man; but when attacked, or when called upon to defend his young, towards which he shows the tenderest attachment, uses his teeth and his arms vigorously. In such an encounter his well-developed canines, and the length and strength of his arms, with which he hugs his antagonist in his embraces, stand him in good stead. He will even on occasion lay about him with spears wrested from his pur- suers. At other times he is on the whole a good-humoured creature, who but seldom makes himself guilty of doing damage to fruit-plantations, though bananas in particular are a strong temptation to him. Since the changes in his dentition are completed only in the sixth year, we may estimate the length of his life at about equal to that of man. Our actual knowledge of the life of this ape in a state of freedom may be said to be confined to the particulars just given. The young have been observed only in captivity. Putting aside all individual differences, which, it should be remembered, may be partly due to the treatment and training to which different specimens have been sub- jected, we find that all the observations which have been made on probably more than a hundred young chimpanzees which have been brought captive to Europe, combine to show that they are very excitable, sanguine, in- telligent creatures, whose qualities of mind and temperament can scarcely be distin- guished from those of similarly endowed children of the human species. Satisfaction, joy, which is manifested even by smiling, depression, pain, despair, anger, and fury succeed one another suddenly, like rain and sunshine, and the great vivacity of their temperament is shown in their almost un- ceasing occupation with toys and gymnastic apparatus, in their attentive observation of their surroundings, and of all that goes on about them. To all who show themselves to be of a kindly and sympathetic nature they exhibit the most touching and devoted attachment, and their amiability in playing with children is another conspicuous feature of their disposition. Easy and rapid apprehen- sion, careful observation, and the power of drawing logical conclusions are qualities that cannot be denied to him. Like the child the young chimpanzee knows instantly whether the visitor whom he sees for the first time is kindly disposed to him or not. I have myself observed a case in which a chim- panzee, who had got himself a little scratched To fact faff 34. PLATE II. — THE GORILLA (Troglodytes gorilla). BLACK ANTHROPOID APES. 35 by the point of a slightly projecting nail in the wall of his cage, first carefully examined the part, then sought to remove the projecting point, and afterwards, when he was let out, immediately proceeded to search for the head of the nail on the outside of the wall, and then on finding it began to use his teeth and fingers in making efforts to pull out the nail. Ulti- mately this was done for him with a pair of pincers, whereupon he broke out into lively demonstrations of joy. "He died like a human being, not like a beast," said the physician who attended the chimpanzee in the garden at Hamburg during its last ill- ness. On the ground of very slight differences, which may easily be only individual varia- tions, French anatomists had distinguished a second species of black African anthropoid apes, the Chego (Troglodytes Tchego). To this species was assigned a female of only five or six years old, purchased for the Dresden Zoological Gardens in 1873 and kept there till her death, under the name of Mafoka. This individual may have been a hybrid between a gorilla and a chimpanzee. Of the chimpanzee it had the large standing- out ears, the lips and the muzzle, and the narrow hands and feet; of the gorilla, the savage appearance due to the very prominent eyebrows and the broad nose, together with the powerful arms; the legs, perhaps, were somewhat longer and more powerful than in the other two species. The animal had been captured in South Guinea. In its behaviour it was in no way different from a chimpanzee. The largest and most powerful of the anthropoid apes is the Gorilla ( Troglodytes gorilla], which in the upright position may attain a height of 5 feet 3 inches, and when sitting appears larger than a human being since its legs are shorter. The body is in fact stronger, the shoulders are broader, the arms shorter than in allied anthropoid apes, the arms reaching only to about the knees. The changes which the animal, especially the male, undergoes with years are extra- ordinary. The young gorilla, of which a specimen was brought to Europe by Dr. Falkenstein, so far the most important and indeed almost the sole result of the German expedition under Glissfeld, has a roundish head with a pretty well arched brow, promi- nent orbits, flat nose, large muzzle, very small human-like ears, powerful breast and limbs, and a fat projecting paunch. The thick skin everywhere gathers into broad folds, even on the forehead, so that the expression of the face is somewhat like that of an old meditative negro. In the male much more than in the female, as is excel- lently shown in Plate II., the jaws and the ridges above the eyes are developed in a fearful manner. A high sagittal crest, which gives to the crown and back of the head in the living animal the form of the ridge of a house -roof, runs along the whole length of the skull ; and from it highly prominent lateral ridges run on each side towards the ears. The orbits become enor- mously thick and large, so that the rather small eyes lie deeply sunk in their cavities. The jaws are very prominent, and when opened to the very slightest extent allow us to see the large conical canines which rise far above the summits of the other teeth. The snout is not so round and muzzle-like as in the case of the chimpanzee; the lips, and especially the under lip, not so extensible as in the latter, in which it takes the place of a cheek-pouch. The nape of the neck of the adult gorilla is a genuine bull -neck, the breast is rounded, the belly, though not so plump as in the young, is at least of con- siderable size. The limbs are extremely muscular, the hands and feet most like the corresponding parts in man. The hand is broad, the fingers in about the same propor- tions as those of man, the fore and middle finger united by skin to the first joint. With the exception of the thumb, which is feebly developed, the hand looks like the widely THE MONKEYS OF THE OLD WORLD. spread out hand of a smith. The foot is broad, not so much contracted and arched at the instep as that of the white man, but more like the flat foot of the negro; the toes are short and broad, although somewhat longer than those of man; the great toe is strong and capable of being moved con- siderably apart from, and of being opposed to the other toes. In this and in the weak thumb lie the chief differences of the extre- mities of the gorilla as compared with those of the human species. The front part of the face is naked, the skin, like that of the hands and feet, being blackish; the body is covered with coarse hairs, which on the cheeks form slight whiskers, and on the nape of the neck a moderately large tuft. The young have quite black hair; the fur of the adult becomes matted, and in colour brownish- black even sprinkled with gray. The up- ward direction of the hair of the fore -arm is very marked. The gorilla lives a retired life with wife and child in the thickest forests of the west coast of Africa near the Gaboon river. Usually it walks on all -fours, delights in climbing trees, which it does with great facility, and on the trees constructs resting- places for itself with twigs and leaves. It lives on fruits, leaves, and a peculiar kind of grass growing amidst brushwood. Its usual cry is plaintive, but its cry of rage resembles the growl of a tiger. Beyond doubt this animal, so strong and so formidably armed, must be a highly dangerous antagonist in a fury, an antagonist able to withstand any ravager of the wilderness, and accordingly also man. But the history of the gorilla is interwoven with so many fables that it is difficult to unravel the truth. The stories which negroes and some white men have told of him are in a great measure hunting tales. So much we seem to be able to gather from them, that the gorilla for the most part does not trouble himself about man unless he is suddenly and unawares alarmed and attacked. The female then uniformly takes to flight with her young one, but the male prepares for defence, rushes bellowing on all-fours upon his anta- gonist, on approaching whom he stands up like a bear and tries to strike him down with his hands, and to tear him to pieces with his teeth. The sport is no doubt a highly dangerous one, but yet probably less danger- ous than hunting the lion or the tiger. Savage enough the creature seems, and naturally inspires terror in proportion. The young gorilla that lived for some time in the Berlin aquarium was a very good- humoured, but quiet and grave-looking crea- ture, and in its calm and composed demean- our presented a strong contrast to a much more lively chimpanzee, which often vainly sought to engage it in play. Reade, who kept a young gorilla in its native land, describes it as being quite as sensible and docile as chimpanzees of the same age. In place of the cheerful and even noisy disposi- tion of the chimpanzee we have in the case of the gorilla a quieter and graver tempera- ment. Red Anthropoid Apes (Simia). With very long arms, and twelve pairs of ribs ; natives of the East Indies. In the depths of the marshy forests and jungles of the island of Borneo, more rarely on Sumatra, there is found an anthropoid ape, which attains a height of 4 feet 7 inches at the most, and is usually called Orang-utang, though by the natives Mias (Simia satyrus), Plate III. Many naturalists have admitted several species; the distinctions which they pointed out, however, seem to be more of an individual or sexual character. As in all apes the ridges above the eyes and the crests of the skull, as well as the jaws, are in these also only gradually developed with years and more particularly in the male sex. As the extraordinary length of the arms To face fast 36. PLATE III. — THE ORANG-UTANG OR MIAS (Simla satynts). RED ANTHROPOID APES. 37 in itself indicates (a mias of 4 feet 5 inches spanned with outstretched arms and hands a length of 7 feet 10^ inches), this ape is an arboreal climber in a much greater measure than his African kindred, and in this respect, as in many other anatomical characters, re- sembles the gibbons, which like him belong to the East Indies. The skull in the young and the female is round, but at the same time furnished with powerful jaws, which even in the young protrude much more than in the African apes, and with their covering of thin but wide lips have almost the appearance of a kettle-drum seen from below. The orbital and cranial ridges even in old males are less prominent than in the chimpanzee, and still less so than in the gorilla. On the other hand two half-moonshaped projecting cheek- swellings (absent in the female) give to the adult male a very hideous aspect, reminding one of the baboons, and this hideousness is intensified by the fact that the creature has a pouch in the throat capable of being dilated with air at pleasure, and when so dilated resembling a crop. The arms, which are thin, especially the lower parts, and covered with long bristly hairs, are so long that when the creature stands upright with bent fingers the knuckles touch the ground. The hands have rather long fingers and the feet long toes, and both are narrow. The thumb is pretty strong. The wrist has one bone more than in man. The abdomen is thick and protruding; the legs are short and thin. The face, hands, and feet are naked, slate-gray in colour, the long hair of a dark rusty red, but brighter in the young. In old males the canines are extremely prominent. The adult orang-utang, when he has set himself to rights on a tree with his young one, which in Plate III. is represented as doing the kindly office of hunting for insects on his parent, is described in the most trust- worthy accounts of travellers as a good- humoured and well-disposed creature, gener- ally to be seen swinging itself by means of its long arms with much deliberation from branch to branch, and after careful trial from tree to tree, descending to the ground only when forced to do so by the most urgent need of water. It breaks off twigs and small branches to make sleeping-places for itself on high trees, and is said to employ large leaves to protect itself against rain. It lives chiefly on fruits, which it opens with great dexterity. According to the reports of the natives the orang has to fight against only crocodiles and large serpents, and these contests mostly end in leaving it victorious. It does not fear man, but when attacked defends itself cour- ageously with hands and teeth. An orang, which had got its arm smashed by a shot, climbed up a high tree with great agility, and with its uninjured arm broke off a number of branches with their leaves on, with which it quickly made a scaffolding on which it screened itself completely from the eyes of its pursuers. An infant orang, still without teeth, which Wallace found on the breast of its mother, who had been killed, was quite as helpless as a human child would have been, eagerly clutched him in order to suck, and cried like a child when it had dirtied itself. At the end of a month it cut its first two in- cisors, and made its first attempts at walking. Young specimens of this ape have often been brought to Europe and tamed. They are easily trained to cleanliness, are obedient, grave-looking, almost melancholy (partly per- haps in consequence of the cold), cover them- selves up in bed, climb with great facility, are quite as expert in gymnastic exercises as their African cousins and as much afraid of reptiles, are fond of intoxicating drinks, extremely attached to their keepers, but far less attentive and less easily excited than the African apes. That they are not wanting in reflection is shown by the well vouched-for case in which an ape of this kind, after it had seen the lock of its chain opened with a key, carefully examined the lock and tried to open it by means of a piece of wood which it turned THE MONKEYS OF THE OLD WORLD. about in all directions in the keyhole. As against that of the highly excitable, always active chimpanzee, ever inclined to fun and frolic, the school-certificate of the orang would run something like this: A quiet reflective child, serious and meditative, even tedious. The particulars regarding the young mias referred to above as having been captured by Wallace will be read with interest. A female mias having been shot, the young one was found close by " face down- wards in the bog. This little creature was only about a foot long, and had evidently been hanging to its mother when she first fell. Luckily it did not appear to have been wounded, and after we had cleaned the mud out of its mouth it began to cry out, and seemed quite strong and active. While carrying it home it got its hands in my beard and grasped so tightly that I had great difficulty in getting free, for the fingers are habitually bent inwards at the last joint so as to form complete hooks. At this time it had not a single tooth, but a few days afterwards it cut its two lower front teeth. Unfortunately I had no milk to give it, as neither Malays, Chinese, nor Dyaks ever use the article, and I in vain inquired for any female animal that could suckle my little infant. I was therefore obliged to give it rice-water from a bottle with a quill in the cork, which after a few trials it learned to suck very well. This was very meagre diet, and the little creature did not thrive well on it, although I added sugar and cocoa-nut milk occa- sionally to make it more nourishing. When I put my finger in its mouth it sucked with great vigour, drawing in its cheeks with all its might in the vain effort to extract some milk, and only after per- severing a long time would it give up in disgust, and set up a scream very like that of a baby in similar circumstances. When handled or nursed it was very quiet and contented, but when laid down by itself would invariably cry; and for the first few nights was very restless and noisy. I fitted up a little box for a cradle, with a soft mat for it to lie upon, which was changed and washed every day; and I soon found it necessary to wash the little mias as well. After I had done so a few times it came to like the operation, and as soon as it was dirty would begin crying, and not leave off till I took it out and carried it to the spout, when it immediately became quiet, although it would wince a little at the first rush of the cold water, and make ridiculously wry faces while the stream was running over its head. It enjoyed the wiping and rubbing dry amazingly, and when I brushed its hair seemed to be perfectly happy, lying quite still with its arms and legs stretched out while I thoroughly brushed the long hair of its back and arms. For the first few days it clung desperately with all four hands to whatever it could lay hold of, and I had to be careful to keep my beard out of its way, as its fingers clutched hold of hair more tenaciously than anything else, and it was impossible to free myself without assis- tance. When restless, it would struggle about with its hands up in the air trying to find something to take hold of, and, when it had got a bit of stick or rag in two or three of its hands, seemed quite happy. . . . Finding it so fond of hair I endeavoured to make an artificial mother, by wrapping up a piece of buffalo-skin into a bundle, and suspending it about a foot from the floor. At first this seemed to suit it admirably, as it could sprawl its legs about and always find some hair, which it grasped with the greatest tenacity. I was now in hopes that I had made the little orphan quite happy; and so it seemed for some time, till it began to remember its lost parent, and try to suck. It would pull itself up close to the skin, and try about everywhere for a likely place; but, as it only succeeded in getting mouthfuls of hair and wool, it would be greatly disgusted, and scream violently, and, after two or three attempts, let go altogether. One day it got some wool into its throat and I thought it would have choked, but after much gasping it recovered, and I was obliged to take the imitation mother to pieces again, and give up this last attempt to exercise the little creature. After the first week I found I could feed it better with a spoon, and give it a little more varied and more solid food. Well-soaked biscuit mixed with a little egg and sugar, and sometimes sweet potatoes, were readily eaten; and it was a never-failing amusement to observe the curious changes of coun- tenance by which it would express its approval or dislike of what was given to it. The poor little thing would lick its lips, draw in its cheeks, and turn up its eyes with an expression of the most supreme satisfaction when it had a mouthful par- ticularly to its taste. On the other hand, when its food was not sufficiently sweet or palatable, it would turn the mouthful about with its tongue for a moment as if trying to extract what flavour there was, and then push it all out between its lips. GIBBONS. 39 If the same food was continued, it would set up a scream and kick about violently, exactly like a baby in a passion. After I had had the little mias about three weeks, I fortunately obtained a young hare-lip monkey (Macaais cynomolgus), which, though small, was very active, and could feed itself. 1 placed it in the same box with the mias, and they imme- diately became excellent friends, neither exhibiting the least fear of the other. The little monkey would sit upon the other's stomach, or even on its face, without the least regard to its feelings. While I was feeding the mias the monkey would sit by, picking up all that was spilt, and occasionally putting out its hands to intercept the spoon; and as soon as I had finished would pick off what was left sticking to the mias' lips, and then pull open its mouth and see if any still remained inside; afterwards lying down on the poor creature's stomach as on a comfortable cushion. The little helpless mias would submit to all these insults with the most exemplary patience, only too glad to have something warm near it, which it could clasp affectionately in its arms. It sometimes, however, had its revenge; for when the monkey wante.d to go away, the mias would hold on as long as it could by the loose skin of its back or head, or by its tail, and it was only after many vigorous jumps that the monkey could make his escape. It was curious to observe the different actions of these two animals, which could not have differed much in age. The mias, like a very young baby, lying on its back quite helpless, rolling lazily from side to side, stretching out all four hands into the air, wishing to grasp something, but hardly able to guide its fingers to any definite object ; and when dissatisfied, opening wide its almost toothless mouth, and expressing its wants by a most in- fantine scream. The little monkey, on the other hand, in constant motion; running and jumping about wherever it pleased, examining everything around it, seizing hold of the smallest objects with the greatest precision, balancing itself on the edge of the box or running up a post, and helping itself to anything eatable that came in its way. There could hardly be a greater contrast, and the baby mias looked more baby-like by the comparison. When I had had it about a month, it began to exhibit some signs of learning to run alone. When laid upon the floor it would push itself along by its legs, or roll itself over, and thus make an unwieldy progression. When lying in the box it would lift itself up to the edge into almost an erect position, and once or twice succeeded in tumbling out. When left dirty, or hungry, or otherwise neglected, it would scream violently till attended to, varied by a kind of coughing or pumping noise, very similar to that which is made by the adult animal. If no one was in the house, or its cries were not attended to, it would be quiet after a little while, but the moment it heard a footstep would begin again harder than ever. After five weeks it cut its two upper front teeth, but in all this time it had not grown the least bit, remaining both in size and weight the same as when I first procured it. This was no doubt owing to the want of milk or other equally nourishing food. Rice-water, rice, and biscuits were but a poor substitute, and the expressed milk of the cocoa-nut which I sometimes gave it did not quite agree with its stomach. To this I imputed an attack of diarrhoea, from which the poor little creature suf- fered greatly, but a small dose of castor-oil operated well, and cured it. A week or two afterwards it was again taken ill, and this time more seriously. The symptoms were exactly those of intermittent fever, accompanied by watery swellings on the feet and head. It lost all appetite for its food, and, after lingering for a week a most pitiable object, died, after being in my possession nearly three months. I much regretted the loss of my little pet, which I had at one time looked forward to bringing up to years of maturity, and taking home to England. For several months it had afforded me daily amusement by its curious ways, and the inimitably ludicrous expression of its little coun- tenance. Its weight was three pounds nine ounces, its height fourteen inches, and the spread of its arms twenty-three inches." — Wallace, Malay Archi- pelago, chap. iv. Gibbons (Hylobates). Tailless Asiatic arboreal apes, with extraordinarily long arms and hands, and small naked spots on the buttocks. These are the dwarfs among the anthropoid apes, for they never exceed 3 feet 3 inches in height. The arms are so long that even in the upright position they must be bent at the elbows in order that the wrists may touch the ground. The round well-formed head, the face with 4o THE MONKEYS OF THE OLD WORLD. the small rounded human-like ears, orbits and jaws scarcely at all protruding, and the but slightly flattened nose, the rounded breast, as well as the internal structure of the head and the skeleton of the body, would cause these apes to resemble man more closely than any others, were it not for the greatly contracted abdomen, the long pointed canines in the upper jaw, the monstrously long arms, hands, and feet, the dense woolly covering of hair, and the naked patches on the buttocks answering to the ischial callosities of other monkeys. This last feature is, how- ever, not very conspicuous, inasmuch as the patches are often hidden by the surrounding hair. Even the brain is much less rich in folds and convolutions, and resembles that of the Semnopitheci rather than the complicated brain of the large anthropoid apes. The presence of a pouch in the throat in both sexes, of distinct though less noticeable cheek-swellings in the old males, the structure of the limbs, and the existence of a super- numerary bone in the wrist, are all characters in which this creature approaches the mias; only one might say that the arms are lengthened to the extent of caricature. They are so long that the gibbons but seldom make use of them in walking on the ground, which indeed they touch only on exceptional occa- sions when living in freedom. They then waddle along upright with their great toes widely spread out, with uplifted arms stretched out sidewards as a balancing rod, the long hands hanging down like goosewing-dusters, the head hanging a little forwards, and the back bent like a fiddle-bow. On the trees of the lower forests of the Great Sunda Islands and the neighbouring mainland as far as Assam and Southern China, and on the island of Hainan, dwell the seven species of this genus, which are indeed mostly distinguished by only very unimport- ant differences. The only exception in this respect is the largest species, the Siamang (Hylobaies syndactylus), which is found only on Sumatra and the Malay Peninsula, and has the second and third toes of the hind-feet united. All observers are unanimous in admiring the facility, agility, and security with which these apes, which mostly live socially in troops of thirty or more, move about in their primeval forests. They appear rather to fly than to leap. In the act of leaping they can alter the direction in which they are moving. The smallest twig serves as something to catch hold of with their long arms or to rest on with their powerful feet, in order to give them- selves a new impetus for darting across intervals of thirteen or fourteen yards. Captive specimens have been known to catch fruits thrown to them while darting through the air, without being thereby prevented from reaching their goal. Gibbons are to be found only in low-lying regions, for in spite of the frequently dense woolly fur with which they are covered, they are extremely sensitive to cold. They feed chiefly on juicy leaves, but, as observations on captive specimens show, do not despise insects and eggs, a diet in which probably we may read the significance of the large canines. A tamed hoolock ate most eagerly of rice and bananas, and drank coffee, tea, and milk, usually merely licking its hand after dipping it into the liquid, as we see one of the white-handed gibbons doing in the illustration on p 43, though when very thirsty it would drink out of the cup. But besides the articles of food mentioned it would also take eggs or the wing of a fowl from a plate, and sought for spiders, and showed great dexterity in catching flies with its right hand, eating them when caught. With one exception all observers who have seen gibbons in a state of nature or in captivity describe them as good-humoured, gentle, and even timid creatures, which live at peace with other animals, readily accustom themselves to the presence of well-disposed men, have no bad habits, and afford much entertainment by their astonishing feats of GIBBONS. gymnastics. While most of the gibbons only scream and express their fear, excitement, or anger in that way, the siamang is said actually to sing and in fact to ascend the chromatic scale through a whole octave; and of the hoolock it is recorded, that it has a pleasant melodious voice, although the sounds that it emits cannot exactly be called singing. That older individuals when caught be- have violently, biting and scratching, and that mothers, who are generally timid, defend their young even at the sacrifice of their own lives, are too common phe- nomena to call for any special remark. The Hoolock (Hylodates leuciscus (hoo- lock}}, of which an illustration is given, fig. i, is perfectly black with the excep- tion of a white fillet on the forehead, and even its teeth are dark coloured. It is a harmless creature, which prefers figs to any other kind of food, and is fond of roaming about iri bamboo jungles. It has no throat-pouch, but has a loud voice. Unfortunately it does not live long in captivity, since it is accustomed to the moisture and heat of the low- lying parts of Bengal and the Eastern Peninsula. A contributor to Land and Water (June 19, 1869) gives the following interesting account of two hoolocks which he had kept while resident in the north-east of India: — " I was lucky enough to purchase a very young hoolock, which the one in my possession [an adult female] immediately adopted, and on the appearance of any danger it called it to itself, opened its arms to receive it, and springing with it into the nearest tree placed it in safety. One day a servant brought to me a large snake which he had killed, the sight of which caused the hoolock intense emotion. It called the young one to its arms, sprang up a ladder which was near at hand, and commenced a series of short howls, arching its eyebrows, and apparently calling the attention of the young one to the dangerous enemy in its vicinity. It refused to descend as long as the snake was in sight. It played with the young one in the most inter- esting manner, ran after it, and dragged it about by its arms and legs, pinched it and pulled its ears, and the two would tumble heels over head on the grass together like two school-boys. The young one was unfortunately strangled in a tree by a string which was round its neck, and the grief of its foster-mother was quite heart-rend- ing. She examined it carefully, raised its lifeless hands with her own, and dropped them in deep Fig. i. — The Hoolock (Hylotates leuciscus). despair. Again and again did she repeat the action, and on the removal of the body from her sight she sat disconsolately in the verandah, resting her head on her hand, and never tasted food for the remainder of the day. During the next morn- ing she searched all the trees in the neighbourhood, and crept in and out of the house in a dejected manner, but in the evening she ate food and returned to the ordinary pursuits of apish life." The same writer states on the authority of M. Barbe, a Roman Catholic priest whose general accuracy is asserted to be well vouched for, that THE MONKEYS OF THE OLD WORLD. a mother hoolock "on being shot has been seen to take the young one from her neck, place it on the bough beside her, and then drop down dead at the feet of her destroyer." The White-handed Gibbon (Hylobatcs lar), a pair of which are represented in fig. 2, is distinguished by having the whole of the face bordered with white, and the hands and feet white on the upper surface. TAILED MONKEYS (CAUDATVE). With more or less developed tail, ischial callosities, and mostly also cheek-pouches. Anatomists have frequently drawn atten- tion to the fact that the tail of these and the American monkeys, even when quite rudi- mentary, as in the Barbary ape, presents essential differences in the structure of the vertebrae when compared with the correspond- ing part in man and the anthropoid apes. But apart from these differences, to which we can only allude, great variety is shown in the development of this appendage, which, it must be added, is used only to guide the movements, especially in leaping, never as an organ of touch or prehension, as by the American apes. From the rudimentary stump of the magot or Barbary Ape up to a tail exceeding the body in length, as it does in many Semnopitheci and Cercopitheci, all possible transitions are met with. Special attention is due to the ischial callosities, naked and mostly warty patches on the buttocks, frequently coloured by pig- ments, or sometimes only by the blood show- ing through. No doubt they are attributable to the sitting or squatting attitude which most of them adopt during the greater part of their life, and especially in sleeping. In many cases these spots are almost hidden by the hair, as in the gibbons. They attain their highest development among the baboons, and in the mandrill the various feelings of the creature are even expressed by variations in the colour of these patches, in the same manner and with the same clearness as in man they are ex- pressed by blushing. Cheek-pouches are very seldom wanting, but in some are only slightly developed. They are formed by an involution of the inner skin of the cheek, and at first are developed only below the opening of the mouth in the skin belonging to the lower jaw, and open inwards by a slit parallel to the opening of the mouth. When further developed they extend over the entire cheek. The monkey, on occasion of his plunderings of trees, gardens, and fields, when he must be constantly on his guard against enemies, whether beasts of prey or men, and constantly ready for sudden flight, stuffs these pouches with his hands and tongue as full as they will hold, in order that he may afterwards be able to consume the proceeds of his foray in quiet. With respect to the general form of the body and the prominence of characters belonging to the lower animals, we see the most manifold transitions from very slender figures with small nearly round heads and slightly protruding jaws, to extremely robust, thickset, and even massive forms, with very protruding muzzle and a savage and bestial expression. Yet the limbs are mostly of equal length; and when not climbing, the usual mode of progression among these animals is walking on all-fours with the spinal column in a horizontal position, the head slightly erected, and the whole sole of the foot planted flat on the ground. A clear line of demarcation cannot be drawn in this respect between the separate groups. Among those monkeys which have massive forms there is a greater tendency to a terrestrial as distin- guished from an arboreal mode of life. Except on the face and the inner surface of the hands and feet the body is covered with hair, which is mostly, however, not very thick. Tufts on the head and tail, beards and whiskers, pencils and mantles of hair, are frequently developed. TAILED MONKEYS. 43 The chest is always flattened at the sides, not broad as in the anthropoid apes. Although the dental formula /2 . I . 2 . T. 2.1.2.3 is the same in all tailed monkeys as in man and the anthropoid apes, yet there are con- siderable variations within this formula, variations which, apart from the definite form, are partly due to age partly to sex. From the herbivorous Semnopitheci, whose constricted stomach, almost adapted for ru- Fig. 2. — The White-handed Gibbon (Hylobatcs lar}. minants, plainly shows what they are intended for in this respect, and whose nearly square molars soon lose by friction their blunt knobs or tubercles, there is a long series of gradual modifications till we rise to the Cynomorpha;, and more particularly the Gelada, in whose frightful jaws the long narrow laterally compressed molars with four sharp tubercles when seen from the side present exactly the appearance of the dentition of a carnivore. The last molar is sometimes larger, some- times smaller, sometimes with four, sometimes with five tubercles, but these differences do not appear to have any influence on the rest of the organization. As regards the significance to be attached to the canines it is necessary to be very cautious. If the enormous, sharp, curved canine with sharp cutting edge behind in the upper jaw of the Cynomorpha;, and above all in the gelada, can scarcely be matched even 44 THE MONKEYS OF THE OLD WORLD. in the cat tribe, it should not be forgotten that this tooth is the last of all to attain its full development, notwithstanding that it cuts the gum sooner than others. It is, moreover, a tooth greatly affected by sex. All males among the monkeys have far larger canines than the females, and this dispro- portion, which is connected with the develop- ment of the jaws generally, and that of the ridges and borders of the skull, may become so considerable that we might often believe that we had before us skulls of two different species instead of skulls belonging to different sexes of the same species. Hence it follows that in this case the character of the canines as well as that of the whole dentition is influenced not by the nature of the food but by the duty of defence, which falls chiefly on the male. With the development of the canines is connected that of the diastema or gap between the teeth leaving room for the canines of the opposite jaw. The teeth of the upper and lower jaw always fit into one another when the mouth is shut in such a manner that the projecting canine of the lower jaw becomes wedged into a gap behind the incisors of the upper jaw, while the canine of the upper jaw, usually considerably larger than that of the lower, gets similarly wedged between the canine of the lower jaw and the first premolar, the form of which is essentially modified thereby ; but the size and depth of these gaps depends, as may easily be seen, on the size of the canines. The original milk dentition always consists, as already remarked in the Introduction, of (2.1.2.0 \ twenty teeth I = 201, and differs from the final dentition, not merely in the absence of the molars, but also in the greater strength and breadth of the inner incisors, in the smaller size of the canines, and the sharper tubercles of the premolars. All tailed monkeys are diurnal in their habits, and most of them live together in herds of thirty or more, under the leadership of one of the older males, who is probably the patriarch of the whole troop, and usually maintains a strict rule. The monkey brings up his young in much the same way as man, often with excessive tenderness and great care, shown especially in combing, currying, and searching for parasites (a favourite occu- pation, represented in several of our plates). Males and females defend their young with bravery and fearlessness; but at the same time they punish them by boxing them on the ears, or cudgelling them, if they have committed any offence against the rules of the herd or have failed to render due obedience. They instruct them with the utmost zeal in all the arts necessary for life, they lead them about in their tender years, afterwards guide them in climbing, running, and leaping, and in seeking for food and hiding-places; in short, they look after their bodily and mental welfare like good parents. Young monkeys are mostly ready for all kinds of games and sports, and easily tamed. In a troop of monkeys living in freedom there nearly always prevails bustling activity, continual commotion, and boundless game- someness, which only seldom degenerates into open quarrel and violence. In youth they are all sly, tricky, easily excited, observ- ant, imitative, and it is only at a later stage, on reaching puberty, that the more disagreeable qualities come out, cunning, ill- nature, lasciviousness. Yet in these respects the most extensive gradations are observ- able, and between many Cercopitheci, good- humoured to excess, even stupid, and the savage ill-natured baboons, conscious of their strength, there is a wide chasm. All tailed monkeys enjoy vegetable food, but perhaps the Semnopitheci are the only ones that feed upon it almost exclusively. Insects, eggs, birds, are readily eaten, and many, such as the baboons, feed chiefly on animal food, and do not even despise poison- ous scorpions, millipedes, and large spiders. TAILED MONKEYS. 45 In plundering plantations, fields, and gardens they are all masters, breaking in in spite of all precautions, and destroying more than they devour. Where not pro- tected by superstitions they are in consequence relent- lessly pursued by natives and settlers. When wounded they seek to quench the flow of blood by bandaging with leaves and grass. Most of them flee from man, but the large baboons make a stand against him, and are stated even to attack him at times. The flesh of most species is regarded as savoury. Fig. 3. — Family of Entellus Monkeys (Semaa- pithccus entctlus}. page 46. is not their only The weaker sorts are pursued by the smaller four-footed carnivores and by birds of prey, the larger by the large climbing mem- bers of the cat tribe. To all, perhaps, serpents are the most dangerous enemies, and of these all monkeys show a great dread. The members of a troop stand by one another faithfully in danger, and we have reports from eye-witnesses, which must inspire us with genuine admiration of the high courage displayed by individual monkeys on such occasions. 46 THE MONKEYS OF THE OLD WORLD. That creatures so highly gifted and intel- lectually awakened should be easily tamed and trained in early years is just as little sur- prising as that they should change their dis- position, and become cunning, ill-tempered, ill- behaved, ill-natured and ready to snap, when they are placed in confinement, even though they arecollected,as is now customary, into large monkey- houses. This hap- pens all the more frequently since it is the practice to cage up in the monkey-houses in- dividuals of differ- ent species, which tease one another, while in a state of freedom only indi- viduals of the same species herd to- gether, and individ- uals which, more- over, are closely linked together by ties of blood. Even with the greatest care most monkeys in our climate be- come ill; they suffer from the want of the sun, the warmth, the forests of their homes. How can one then draw any inference from the behaviour of these sickly creatures, constantly teased and plagued by their fellows, as to the qualities which they display in the free life of their native woods? Owing to the gradual nature of the transi- tions between the different forms, separate groups can with difficulty be distinguished. From these groups we single out only a few well-marked representatives. In most genera there are many species but slightly different from one another. Fig. 4.— The Proboscis Monkey or Kahau (Semnopitheius nasica). Semnopitheci. The monkeys belonging to the genus Semnopithecus are arboreal creatures of slender shape, with well-developed thumbs, long tails, a compound stomach of three parts, and sometimes with, sometimes without, cheek-pouches. In the representation on p. 4$ of a family of the sacred monkey of the Hindus, the Entellus Monkey or Hunuman (Sonno- pithecus cntcllus), a typical species of the genus is exhibited, engaged in its favourite occupations. The mamma is search- ing the fur of papa, who remains pa- tiently and com- fortably still under the operation. The oldest son is teasing some younger ones who are playing to- gether, and in the background the daughter-in-law is nursing her off- spring. A round head with slightly pro- truding muzzle, slender neck and body, moderately long limbs with well- formed thumbs and great toes, the tail fur- nished with a terminal tuft of hair, and about a yard long, much longer than the body, which measures only some two feet; a rather rough coat of fur with hair spreading out in all directions and forming a stiff hood, as it '"were, round its warty visage ; face, ears, hands and feet black, beard yellow, the rest of the fur whitish,— such are the principal external characters of this species of monkeys, which is distributed through- out the more low-lying regions of the East SEMNOPITHECI. 47 Indies, having in some parts been intro- duced by man. In India this monkey is held in great reverence, is regularly fed, and is nursed when ill. " Hunuman," says T. C. Jerdon in his Mammals of India, " the meaning of which is long-jaws, was one of the monkeys of the monkey- kingdom of Southern India, who aided Rama in his conquest of Ceylon, by forming a bridge of rocks opposite Manar, and greatly distin- guished himself. His figure is often found in Hindoo temples in the guise of a man, with a black monkey face and a long tail : he is not worshipped, only greatly rever- enced." Flocks of it were at one time allowed to carry on their ravages unpunish- ed, and the mischief which they wrought became at last in many places so intolerable, that the British government was obliged to take measures for the destruction of a number of them. Among themselves they are peaceable, and they are extremely lively, excellent jumpers and climbers, roaming about mostly in the tree-tops in great herds, under the leadership of an old male, and feeding on leaves, fruits, and even flowers. When young they are said to be clever and graceful, easily tamed, but always incorrigible thieves. When they grow old, on the other hand, they become Fig. 5. — The Guercza (Colobusgiiercza). page 48. irritable and violent, so that the younger monkeys generally separate themselves from the old ones. They thrive only in the hot plains, not in the mountains. Among the many species of the genus we single out one other very peculiar species, which has even been made the type of an independent genus, the Pro- boscis Monkey or Kahau (S. nasica), fig. 4, which lives in the hot lowlands of Borneo. The body is somewhat more robust than in the previous species; the fur is of various colours, very bright brown, yellow, dark brown, and white, and these colours are differently dis- tributed in the fe- male from what they are in the more brightly coloured male. The cheek- pouches are absent. In youth the kahau has an impudent- looking, turned-up pug-nose, which in another allied species (S. roxellanus), a native of Northern Tibet, is retained the whole life through; but with advancing years the nose, especially in the male, grows long and hooked, and at the same time thick and swollen, and this enlarged nose gets sup- ported by plates of cartilage to which strong muscles become attached, enabling the crea- ture to open its nostrils to an unusual width and close them again. The thin crooked end of the nose hanging down below the mouth is pointed and projects far beyond 48 THE MONKEYS OF THE OLD WORLD. the nostrils. The very large curved canines of the male plainly show that the old monkey cannot be a very agreeable character. The kahau lives socially on trees by river banks, and utters a disagreeable loud howl, which the native name is intended to imitate. Colobi. African monkeys, resembling the Scmnopitheci, but with more powerful jaws and much reduced thumb, and with- out cheek-pouches. From this very rich genus, which is dis- tributed throughout tropical Africa, we select for illustration the Guereza (Colobus guereza), fig. 5, which Riippell discovered in Abyssinia, where it inhabits the mountain forests at a height of from 6500 lo 10,000 feet above the sea. This slender long-tailed monkey is black, with a narrow white band above the eyes, white beard and whiskers, and a white tuft at the end of its tail. As the animal grows older long, fine, soft, white hairs grow out in an elegant curve extending from the shoulder-joint to the small of the back, and these form a spreading mantle in the old males. This monkey is social in its mode of life, is extremely adroit and bold, and carries on its pranks in the high tree -tops, where only a rifle bullet can reach it. The Abys- sinians formerly used its fine coat as a cover- ing for their shields. The Colobi represent on African soil the Semnopitheci of Asia, with which they agree in the form of the body and in the possession of a long tail and compound stomach. But the jaws are more powerful. In an old guereza male the tendons of the muscles form a ridge on the skull almost like that of a carnivore, and the curved cutting canines are weapons not to be despised. The molar teeth get worn away by use in such a manner that only an external plate of enamel remains standing, which gives the teeth when seen from the side the appearance of a saw. The small size of the thumb is characteristic in all Colobi, that member being sometimes repre- sented only by a stump or a wart, and some- times altogether absent. The great toe is normal in structure. The Guenons (Cmopitheais). African monkeys with simple stomach, cheek-pouches, long tail, large thumb, and moderately long limbs. This is an arboreal genus, the more slender species of which would scarcely- have been separated from the Semnopitheci, were it not that the jaws are more powerful and the stomach simple. They inhabit the whole of tropical Africa, as well as our zoological gardens; and in general are good-humoured, easily tamed, and readily bring forth young in captivity. Most of the general character- istics of these monkeys are sketched from tame captive specimens. Various sub-genera have been established very unnecessarily, the distinctions being founded on the number of tubercles on the wisdom teeth in the lower jaw. Those with three tubercles form the sub -genus Myio- pithecus, to which belongs the Talapoin of West Africa, which on account of its large ears and broad nasal septum reminds us of the American monkeys ; those with four tubercles form the sub-genus Cercopithecus, the typical and most numerous group, to which belongs the Diana Monkey of our illustration, fig. 6, as well as the Mona and the Green Guenon (C. sabceus}; those with five tubercles, the sub- genus Cercocebus, constituting the Mangabeys of the traders, among which the snout is rather longer than in the others, somewhat baboon-like, as it is also in the C. fuliginosns of West Africa. The colour of the fur is very various. The larger and somewhat sturdier species are usually of a uniform colour, green; the Talapoin and the common Green Guenon which ascends high up among the mountains and stands our climate best, grayish black; the Mangabey or Moorish Monkey, yellow or reddish-brown; the Hussar or Nisnas Monkey Tofatt f PLATE IV. — GREEN GUENONS (Ccrcopithtcus sabans} PLUNDERING A MAIZE-FIELD. MACAQUES. 49 (C. pyrrhonotus), variegated with differently distributed coloured spots, and mostly also furnished with curious pencils of hair, beards, and tufts like the Semnopitheci. These are the chief typical species. The last-mentioned species, a native of Nubia and Darfur, is common in our zoological gardens, and is agreeable in its ways when young, but sullen and tiresome when old. The Diana monkey (C. diana] is a pretty little creature of a slate- gray colour, which becomes darker on the back and inclines to brown ; its face has a triangular white border, which ends in a long pointed beard, and is continued clown the neck, breast and arms to the fore-arm ; its legs are white on the inside, and it is provided with a long tail without a terminal tuft. It belongs to West Africa, and is often found along with the mona in our zoological gardens and monkey-houses. From the mona, which is similarly marked, it is distinguished by the pos- session of a long beard. In its behaviour ' it makes itself a favourite by its good- nature. The Green Guenon (C. sabczus) is a creature of more powerful frame, ap- proaching more nearly to the macaques; olive-green on the back, with a blackish cap on the crown. On Plate IV. a troop of this species is represented surprised in the plundering of a maize- field. The alarmed animals are trying to save their booty and their young by a hasty flight, while their leader on the fence keeps watch for the threaten- ing danger. All the guenons live in troops, often count- ing more than a hundred head. They are cunning thieves, and subordinate themselves in all their movements to the old male which acts as their leader. Like most other mon- keys they have manifestly a means of com- municating with one another through the modulation of their throat-tones. On account of their depredations they are thoroughly detested by the natives, who catch them chiefly with nets under which they place fruits as bait. They are extremely fond of eggs, but do not despise insects. Macaques (Macaais). With a solitary exception Asiatic monkeys, with a rather thickset frame, protruding muzzle, tolerably powerful jaws, simple stomach, cheek-pouches, and a tail which never grows longer than the whole body. According to the degree of development of the tail several sub-genera have been estab- lished under this genus also: first, those with Fig. 6.— The Diana Monkey (Cercopithecus diana}. page 48. long tail, to which belong the Java Monkey (M. cynomolgtts) and the Malbruk or Bonnet- monkey of Malabar ; next those with only a moderately long tail, such as the Wanderoo (M. silenus) and the Boonder (M. rhesus); and lastly the Magot or Barbary Ape (Inuus or M. ecaudatus}, with a short skinny stump, found in Algeria, Morocco, and on the rock of Gibraltar. THE MONKEYS OF THE OLD WORLD. When the whole series of macaques is carefully examined it is easy to perceive a gradual transition from arboreal to terrestrial forms, a transition still more marked in the baboons. The head is large, the muzzle protruding, the crest and borders of the skull as well as the supraorbital ridges are very prominent, the body and the limbs powerful, the latter almost equally long, the thumb and the great toe highly developed. The canines are very conspicuous, the tubercles on the molar teeth are more pointed, the organs of generation more prominent, and the ischial callosities •"- •• F'g- 7.— Group of Rhesus Monkeys (Afacacus rhesus), page 51. larger than in the previous groups. Their coat is mostly of a uniform colour. Some species ascend high among the mountains, even to elevations in which severe winters prevail. Without doubt these monkeys, which always live in troops under the leadership of an old male, exhibit a high degree of mental development, and in this respect, and con- sequently also in capability of being tamed, they are far in advance of most of the other groups. But if Semnopitheci and Cerco- pitheci are rather shy and even cowardly, the macaques show greater confidence in their strength, and therefore exhibit more boldness and we may say impudence in all their doings. Although to be sure they are likewise expert gymnasts and climbers, they are not to be compared in respect of lightness and grace of movement with the specifically arboreal forms. If we may judge from the unseemly behaviour of the captive specimens they appear to be of a rather sensual nature, although in this regard they do not equal the baboons, who display an incredible degree of grossness, a fact of which one has only too many oppor- tunities of being convinced in monkey-houses. In captivity they pair readily, and they are fruitful not only among themselves but also with other allied species. In respect of their love for their offspring and their readiness to defend them, as well as in all other habits and PLATE V. - GROUP OF JAVA MONKEYS (Macacut cynomolgus). MACAQUES. qualities, they resemble other monkeys. The species are numerous, and since many are distributed over wide areas, it is often difficult to decide whether one has to deal with species or varieties. The Java Monkey (/)/. cynomolgus) is fre- quent in monkey- houses, but not much liked. It is filthy, sensual, and intractable. An olive-green colour with a black cap on the crown for the most part characterizes this . monkey, which, however, varies very much in colour. It was originally distributed over all the islands of the Eastern Archipelago and over the Malay Peninsula, and has been carried by man as far as the island of Bourbon, where it has become wild. Plate V. shows a group of these monkeys frightened away while in the act of drinking by a crocodile emerging from the water. A family group of the Boonder (M. rhesus], fig. 7, which is found almost throughout the East Indies but especially on the Ganges, has been figured for two reasons, first because it represents an intermediate type of the genus, and secondly because it plays in some districts a similar role to the hunuman. This tolerably large monkey, whose skin gathers in folds on the neck, breast, and abdomen, is greenish-gray on the back, and whitish on the under surface, which is only sparingly covered with hair; the naked parts, face, hands, and feet, are of a bright copper colour, the large ischial callosities bright red. An allied species, the Macaciis erythrceus, is similarly coloured, but much larger and slenderer. Both species climb high up the Himalayas at Simla, and even tumble about in the snows of the pine- forests, but yet appear in large part to descend in winter to the lower regions, where they prefer the bamboo thickets on the borders of the streams. They swim and dive admirably, and even take refuge in the water when pursued. Through the reverence which is paid to them by the Hindus these monkeys, conscious of their immunity from punishment have Si become as intolerable devastators as the hunu- man, and all that was said with reference to that monkey applies also to the open-air life of this one. When caught young they are easily tamed, and they are favourite actors in monkey- theatres. When old they become irritable and malicious, and torment their Fig. 8. — The Wanderoo (i\lacacus silcnus}, weaker companions in the monkey-houses in all conceivable ways. The long protruding muzzle with the large curved canines, the thickset body, and the relatively short limbs in the Wanderoo (M. silemis], fig. 8, mark the transition to the baboons. The dark-coloured face is sur- rounded by long white beard and whiskers, beginning above the eyes and leaving only a narrow strip free above the root of the nose. The long fine fur is black behind, brighter in front; the naked parts, ears, hands, and feet, black, the ischial callosities of a pale red. The rather short tail has a tuft at the end. In spite of the devastations which he is THE MONKEYS OF THE OLD WORLD. said to commit at times in cocoa-nut planta- tions, but which cannot be very serious, seeing that he lives mostly in the great forests, the facility with which he is tamed causes him to be much liked in his native country of Malabar, as a domestic animal and "co- median;" and he is frequently exported to Ceylon, whence he is brought to European zoological gardens and monkey-theatres. His behaviour is good-natured, even "dig- nified," as many observers declare; according to the accounts given of him we might call him the philosopher among the monkeys. Some observers even maintain that his re- Fig. 9. — The Barbary Ape (Inuus ecaudatus). morse on account of faults of which he has been guilty may cause him to shed tears, which would certainly bring him very near man in respect of the expression of his feelings. And now for thee, last witness upon Euro- pean ground of the climate of a bygone age, still dwelling in a small troop on the rock of Gibraltar, formerly almost the inseparable companion of the European camel-drivers, the tailless Magot or Barbary Ape (Inmis ecaudatus, Macacus Inuus], fig. 9. The sparse woods on the rocks of North Africa are now the chief home left for this creature, but the destruction of the woods and the advance of civilization, leading to the rooting out of the alfa grass for industrial purposes, have made this ape, which was known even to the ancients, almost a rare animal. When the French, after the conquest of Algiers, stormed the romantic defile of Shiffa, hundreds of these creatures darted up the rocky precipices amidst piercing cries; now the tourist but seldom catches sight of one with his telescope ; and the traveller may entertain some doubt whether, after all, it is not a half- wild ape which the speculative host feeds, and thus keeps attached to some almost inaccessible spot. Although good climbers and gymnasts, the magots are essentially terrestrial forms, with long powerful legs, slightly protruding muzzle, and good-natured eyes; and they can be BABOONS. 53 recognized at the first glance by the want of the tail, which is merely indicated by a small tubercle of skin. The dense shaggy fur is somewhat of a mouse-colour, inclining some- times to brownish-red, sometimes to olive- green, darker on the back, brighter in front and at the sides of the face. The naked parts are flesh-coloured. On the whole good-natured, and inclined to frolic and fun, they are, at the same time, easily irritable and courageous creatures, dwelling chiefly on the rocks, and feeding on fruits, juicy leaves, and, in particular, also on the roots of the dwarf-palm, and often turning up stones to devour the insects, millipedes, scorpions, and even small lizards which they catch under them. They are expert in ex- tracting the sting from scorpions, but of serpents they have a great dread. Sensitive to cold, although they inhabit places where snow falls every year in winter, they change their quarters according to the prevailing wind, a fact which has been clearly observed, particularly in Gibraltar. The troop which lives there was originally beyond question the last remains of numerous flocks which in Pliocene and Post- Pliocene times were dis- tributed throughout the countries bordering on the Mediterranean on the north wherever the dwarf-palm (Chanuerops kumiiis) was to be found; but since that troop, notwithstand- ing all the efforts of the English to preserve it, has several times been on the point of extinction, it has been replenished from time to time by specimens brought from Tangiers. The animals are, however, allowed to live on the rock in perfect freedom. Baboons (Cynocephalits). Large, chiefly African terrestrial forms, with dog-like muzzle, powerful limbs, and dentition like that of a carnivore. The giants of this genus, the gelada and the hamadryas, attain when sitting the full height of man, and appear smaller only when standing, on account of the relative shortness of the legs. Though scarcely any smaller than the gorilla they are inferior to it in breadth of shoulders and chest, which latter in the baboons is narrow and compressed. While in the young the skull is rounder than in mature animals, though the muzzle is from the first very prominent, in the old males, as in the case of the anthropoid apes, there are developed very marked crests and ridges on the top of the skull and in the upper part of the orbits; and frequently the middle riclge, to which the powerful muscles for closing the mouth are attached, is so highly developed that it forms a conspicuous feature even in living animals. The muzzle is not only very protruding, as already stated, but also rapidly receding at the sides, and the dentition is fearful. The canines with their sharp hinder edge resemble curved daggers, the molars are laterally compressed so that they become longer than broad, and their tubercles acquire a cutting edge. The body is powerful, so also are the legs, and the thumbs and great toes are well developed; the tail is never as long as the body, and is frequently provided with a terminal tuft ; sometimes it is altogether rudimentary. Founding on this character as well as upon the position of the nostrils, which are some- times at the end of the snout, sometimes further back, some naturalists have divided the genus into several sub-genera: Cynopi- thecus, with nostrils far back and rudimentary tail, comprising only the Black Ape (C. niger), the sole Asiatic representative of the whole genus; Theropithecus, with similarly situated nostrils, but with moderately long tail, the sub-genus to which, the Gelada (C. gelada] of Abyssinia, is referred ; Cynocephalus, with long tail and nostrils at the end of the muzzle, the sub-genus to which the Arabian and the Common Baboon belong; lastly, Mor- mon, with nostrils in the same position, but rudimentary tail, the sub-genus of which, the Mandrill (C. Mormon], may be taken as the representative. The more slender limbs and body, and the somewhat arboreal habits of 54 THE MONKEYS OE THE OLD WORLD. the Black Ape ally it more closely than any of the others to the macaques, and in particular to the wanderoo, and thereby indicate its Asiatic home. The more powerful thickset frame and the terrestrial habits of life are more marked characteristics in the others. In a state of freedom the baboons never walk upright, but always on all-fours, their hinder quarters waggling from side to side. Many of them have never been seen on trees, others only Very seldom, and especially when bayed by dogs. Among the rocks on the mountains, however, they show themselves to be first-rate climbers, the smallest pro- jection enabling them to take a firm foothold. So far as our information goes, it would seem that all baboons live mostly in con- siderable troops, often numbering several hundred, and in these there are always several old males and females, so that the leadership does not, as among most other monkeys, fall to a single patriarch. This shows in itself, beyond question, a great capacity for mutual accommodation among the creatures, which of course does not exclude the possibility of sundry little quarrels and scrimmages. The troop passes the night in caves in the rocks, and in grottoes on inaccessible precipices, all closely huddled together, and at sunrise they slowly and deliberately quit their retreat in search of food. Large stones are often over- turned by their united efforts in order to seek for any animals that may have crawled under them, such animals forming, along with roots, tubers, juicy leaves, and fruits, their chief nourishment. After that the company bask in the sun with their backs turned to the wind, the older ones sitting on stones, while the young tumble and play about. The old, meanwhile, keep a careful watch all round; the troop next go to some water to drink, and after supper they betake themselves once more to rest. For the most part a troop sticks to the same feeding-ground, for some time at least, but from time to time it changes its ground. On the approach of any danger warning sounds are heard, and the females and the young then crowd together, while the old males, like the champions of the ancient Greeks, advance into the foremost of the fight uttering fearful cries, bellowing, and gnashing their teeth. A bold and proud spirit with contempt of death is beyond ques- tion a characteristic trait of the baboons, and when Brehm records a case in which an old Arabian male baboon gradually managed to extricate a young one, which had been left behind on a rock surrounded by dogs, from the midst of its assailants and before the very eyes of the hunters, inspiring by its determined bearing both dogs and hunters with such respect for its powers that no attack was ventured on, we may well agree with Darwin in saying that here was a proof of heroism of which only few men were capable. But the reverse side is not wanting. All observers agree in describing the young baboons as extremely docile, infinitely com- ical, clever, sly, tricky creatures, while they cannot find words enough to denounce the abominations of all kinds that characterize the old baboons. It is true that they are all in the highest degree gross and sensual, and probably it is not without good ground that it is everywhere said by the natives that the negresses are not safe from the attacks of the large baboons. But if old baboons in captivity are rightly depicted as treach- erous, extremely ill-natured, intractable and ready to bite, this development of character may have its ground in the confinement, which embitters the disposition of the in- telligent creatures. For my own part it is impossible for me to find in this defiant reaction against unworthy treatment a proof of natural depravity, and in the accounts given of their habits in a state of freedom I find no evidence of that, but only of their social virtues and of their brotherly readiness to stand by one another in presence of BABOONS. 55 danger. That the consciousness of strength will lead to many an act of insolent outrage can be easily understood; but that the large baboons do not give way even to the leopard and do not flee before man himself when not bearing firearms, can hardly be reckoned as a fault. The Black Ape (C. (Cynopithccus) nigcr), fig. i o, with slender limbs, very dark woolly fur, and rudimentary tail, we have felt compelled to depict as representing the macaque type. It inhabits the easternmost islands of the Eastern Archipelago, Celebes, the Moluccas, and the Philippines, is regarded as easily tamed, but is not known in a state of freedom. Among the mountains of Eastern Central Africa there lives a group of large baboons, which have been denominated the mantled baboons, because the males in particular have a luxuriant covering of hair a foot long, forming a perruque and a mantle for the shoulders, reaching down to the elbow. These large and powerful monkeys appear to some extent to have the highlands of Abyssinia as the central point of their distri- bution. The larger species, the Gelada (C. gelada), inhabits here only a zone of 6500 -10,000 feet above sea-level, while the Arabian Baboon, which, among the ancient Egyptians, played the same role as the hunuman and the boonder still do among the Hindus, is far more widely spread and descends even to the valleys. Formerly it was a native of Egypt, where it is now quite extirpated, but it still extends to the mountains of Arabia. Both species have a terminal tuft on the tail, and otherwise they show only slight divergences. The Arabian baboon (C. hamadryas], which when old is of a silver-gray colour, but in youth is darker, has nostrils at the end of the snout and large bright-red ischial callosities. Its figure is frequently represented on the Egyp- tian monuments, and it has lent its head to some of the ancient Egyptian gods. The larger Gelada, of which we furnish an illustration, fig. n, is met with at more con- siderable altitudes, has the nostrils situated far back, two naked spots on the breast, and small dark -gray ischial callosities. The naked parts are blackish. There is a brown and a black variety, the latter, which the Abys- sinians distinguish by the name " tokur _____ Vr"y?*2F£.- i • ^^AiM»pgg" -s ._„ CTw^jx^*^- ^- -_^r Fig. 10. — The Black Ape (Cyaoccpha.'tu niger). sinjera," and which is characterized especially by having claw-like nails on the fingers, confined to the greatest elevations. In quite recent times sixteen specimens of this variety were brought alive to Europe by their cap- turer, J. Essler of Hungary, and as many perished during the journey. Even the old captive animals were tolerably well tamed at the end of half a year. They never exhibited the bestial brutality and readiness to bite which are displayed by the hama- dryas. The male, which is considerably larger than the female, defended the latter and one young one against imprudent ap- proaches by sound blows with the hand. When they thought themselves alone the THE MONKEYS OF THE OLD WORLD. members of this family amused themselves. The tones of the voices of these animals, says one observer, were so variously modu- lated and accentuated that people were in- voluntarily induced to believe themselves in the presence of beings endowed with the gift of speech. The mode of speaking of these intelligent creatures reminded one of the inarticulate sounds uttered by men whose speech is impeded by an organic defect in the frtenum lingua-. In fig. 1 1 a herd of geladas is represented Fig. ii. — The Gelada (Cynocephalus gelada}, page 55. during a period of repose. A patriarch sits on a rock in the foreground, accompanied by a female and two young ones at play. In the background the members of the troop are employed in searching for food and in playing. The mode of life of all these species is the same, namely, as above described. The gelada and Arabian baboon are said, how- ever, to live at great enmity with each other, and often to break out into open hostilities to decide frontier disputes, on which occasions the combatants occupying the higher positions roll stones down upon their antagonists. Accounts of this rolling and throwing of stones against enemies ascending from the valley are met with in all the narratives of hunting expeditions and other invasions of their domain, just as invariably as in the BABOONS. 57 tales of the battles round Troy. The hostilities between these monkeys, however, are said to be confined to horrible grimaces, bellowing, gnashing with the teeth, beating the hands on the ground, and tearing the hair from perruques and mantles, and only seldom to lead to serious wounds with the teeth. The Common Baboon (C. Babuiii) which inhabits Central Africa from Abyssinia to Mozambique, may be taken as representative of the maneless smooth-haired baboons, which in walking on all-fours always carry the tail curved as depicted in fig. 1 2. The Chacma or Pig-faced Baboon (C. porcariits) and the Guinea Baboon (C. sphinx) are allied, though somewhat larger and differently coloured species. All three are frequently brought to Europe, but most frequently the mouse- coloured baboon with the dark back, which on account of its docility and good-nature is never wanting as an actor in the monkey- theatres. The mode of life of these creatures in a state of nature resembles that of the mantled baboons, their food is the same; their otherwise good qualities are frequently, as in the case of the latter animals, thrown into the shade by the violence of their sexual instincts. At the Cape the chacma is hated and eagerly pursued on account of its destruc- tiveness, cunning, and savage disposition; but, on the other hand, it is also frequently tamed and employed in searching for water, for which employment it is said, like most ba- boons, to manifest a peculiar fitness, even when the water lies at a considerable depth below the surface. Water is a real necessity for all baboons on account of the frequently dry character of their food. Their halting- places are always selected in the neighbour- hood of water, and it is therefore all the more singular that they cannot swim, but sink to the bottom without being able to save themselves. In South Africa baboons are often very destruc- tive amongst the sheep and crops of the farmers. Anxious to indulge in a little baboon hunting by way of recreation on the borders of the Orange River Free State, Dr. Emil Holub on one occasion made inquiries of a farmer as to how to proceed in order to gratify his wish. The farmer was at once extremely communicative. So pitiable was his account of the losses he had in various ways sus- tained through the baboons, writes Dr. Holub, "we could well understand the grin of satisfaction with which he learnt our object. He became more and more loquacious in his desire to render information ; and when I further explained to him that we were anxious to get some of their skins to stuff, and to carry off some of their skulls, he was quite as- tounded; he had never heard of such a thing, and exclaiming, ' Allmachtag, wat will ye dun?' he walked off, shaking his head, to tell his wife of the doctor's 'wonderlijke' proposal to shoot a 'babouin,' and to send its skull all the way to 'Duitsland.'" It was resolved to lie in ambush for the baboons at their drinking resort. "Only a few minutes had elapsed when one of the farm-boys drew our attention to what seemed little more than a couple of dark specks on the slope of the hills to the right; but we could soon see that they were moving, and when they came within half a mile of us, we could distinctly recognize them as a herd of baboons. The boy said he was quite sure that they were on their way to the water; but to our surprise they did not make any further advance. A quarter of an hour elapsed; half an hour; still no symptom of their approach. All at once, as if they had started from the earth by magic, at the open end of the pond, not sixty yards from our place of ambush, stood two huge males. When or how they had got there no one could tell ; probably they had come by a circuitous way through the valley, or it might be that they had crept straight down through the grass ; they had certainly eluded our observation. Being anxious to watch the movements of the animals, and to ascertain whether they belonged to the herd playing under the mimosas, I refrained from firing, and determined to see what would follow next. Both baboons sprang towards the water, and leaning down, drank till they were satisfied ; then, having gravely stretched themselves, they stalked away solemnly on all-fours in the direction of the herd. There was little doubt, therefore, that they belonged to them, and had been sent forward to reconnoitre; for as soon as they got back, the entire herd put itself in motion, and made its way towards the pond. There were mothers taking care of their little ones ; there were the half-grown animals, the boys and girls of the THE MONKEYS OF THE OLD WORLD. company; but there did not seem to be more than three or four full-grown males. At first only one baboon at a time came to the water's edge, and having taken its draught retired to the rest; but when about ten of them had thus ventured sep- arately, they began to come in small groups, leaving the others rolling and jumping on the sand. . It was not long before two males — the same, I had no doubt, which we had noticed before, came and squatted themselves one on each side of the little creek, which certainly was not more than two feet across. When they stooped to drink, their heads could not have been four inches apart. Here was my chance. Crack went my rifle. But instead of either of them dropping, the two baboons started up; by a mutual instinct they both clutched - . :- Fig. 12. — The Common Baboon (Cynoccphalus Babuiii). page 57. their noses, gave a ringing bark and scampered off. The whole herd took the alarm, and joining in the shrieking clamour, were soon lost to sight. One or two, however, of the larger animals seemed to lag behind and to look inquiringly, as if to ascertain the true condition of affairs. We went down and examined the spot where the baboons had been drinking, and could come to no other conclusion than that the bullet had passed exactly through the narrow interval that had parted their heads; it had lodged just about three feet behind them." — Holub, Sn