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IES = f" entiation ie ibrar i ae WH 7 i bib ale Niet t ry i he ach ih aa ain tinh eat i 4 en Uber Biv “ ae siete pe bai oe a custody arate Hah ahs t ete ‘sitieet th inet frstasettao ee Ait sau see iia eae i es ahiutideae tas fanaa sah Aa pte gant oH sas! esi ee eae i ue toons ¥ seshes titans Bee Peet a re tirant Pesta enh sae ee Pict aie tenth atin ae Le Peet iatat teste ta es = anh a ater that is i rants a Oi sihcethceatetacae at nee ii dtesratoetonsctanerdibytas BatT aoet eecresn aia’ witpaa re uaaraseesttad nat Mi Hehe) sBebos bovis ope: eataehep retires prsuts mbt partes re) Sees AUTHOR’S COPY—REPRINTED FROM PART _ I. REPORT ined PEARL OYSTER FISHERIES GULF OF MANAAR, BY Wee Ae TE ROMAN: BDSG. “FE Ris:, Professor of Natural History in the University of Lzverpool, BUSLISHED, BY THE ROYAL SOCIETY, 1903. * a: Seno SUPPLEMENTARY REPORT VII. TTLEON Oar thE COPEPODA BY ISAAC C. THOMPSON, F.L.S., anpD ANDREW SCOTT, A.LS. [With PLATES I. Tro XX] Nerv. inv. Tye [CEYLON PEARL OYSTER FISHERIES—1903—SUPPLEMENTARY REPORTS, No. VIL] REPORT ON THE COne ie OA COLLECTED BY Proresson HERDMAN, ar CEYLON, 1n 1902. BY ISAAC C. THOMPSON, F.LS., anp ANDREW SCOTT, A.LS. [Wire PLATES I. To XX.] THE Copepopa contained in the collections brought home by Professor HerpMAN may be conveniently divided into four sections, viz. :—(1) those obtained during the voyages out and home; (2) those collected by the tow-net around the Island of Ceylon; (3) those obtained by examination of washings from dredged material (Ascidians, Sponges, Corals, Pearl Oysters, &c.); and (4) the parasitic species found attached to fishes. The collection was contained in 122 bottles, each bottle repre- senting a gathering from one of the stations shown in the appended list. The free- swimming species naturally form by far the largest part of the collection, although they do not contain most of the novelties. Some of the gatherings were preserved in formol, and others in alcohol. Out of the total number, those marked 1 to 41 were collected on the voyages to Ceylon and home, and most of the others during Professor HerpMAn’s three months’ work round Ceylon, while some have been sent since by Mr. Hornett as the result of his further work. Professor Herpman’s method of collecting material from a fast steamer has already been described in the ‘ Transactions of the Liverpool Biological Society.’ The water containing the material enters the ship some feet below the surface and is pumped into the tank from which baths, &c., are supplied. On this occasion he was fortunate enough to have the entire use of one of the bath-rooms, a tow-net being fixed to the tap so that sea-water was running through it day and night. By this means it is practicable to collect material from the whole of the route traversed, and mostly in good condition. This collection of Copepoda has proved to be exceedingly rich and varied, containing 262 228 CEYLON PEARL OYSTER REPORT. as it does no less than 283 species, of which 76 are new to science, while at least ten new genera are required. ‘The list of new forms is as follows :— Ttidgewayia typica, n. gen. & sp. Peltidium ovale, un. sp. Centropages tenuiremis, n. sp. P., angulatum, 1. sp. C. dorsispinatus, n. sp. P. speciosum, 0. sp. Pontella dane, var. ceylonica, nov. P. serratwin, 0D. sp. Labidocera pectinata, n. sp. P. perplexum, 0. sp. LL. kroyert, var. stylifera, nov. Porcellidium brevicaudatum, vu. sp. . var. gallensis, noy. P. acuticaudatum, n. sp. Pontellopsis herdmani, n. sp. P. ravane, 0. sp. Sunaristes inopinata, n. sp. Pseudanthessius Maxuinus, 1. Sp. S. longipes, n. sp. P. chelifer, 1. sp. S. curticaudata, n. sp. P. concinnus, 0. sp. Tegastes imthurmi, n. sp. Lichomolgus gracilis, n. sp. T. donnani, n. sp. L. ieversi, n. sp. T. twynamd, v. sp. L. lankensis, n. sp. 7. chalmersi, n. sp. L. buddhensis, n. sp. Stenhelia brevicornis, n. sp. L. simplex, n. sp. S. gracilicaudata, n. sp. L. elegans, n. sp. SS. longicornis, n. sp. L. robustus, n. sp. S. perpleaa, n. sp. L. gigas, n. sp. S. dentipes, n. sp. L,. dentipes, n. sp. S. minuta, n. sp. Paralichomolqus curticaudatus n. gen. & sp. S. knoxi, n. sp. P. longwaudatus, n. sp. Parastenhelia hornelli, n. gen. & sp. Hermannella robusta, n. sp. P. similis, n. sp. HZ. serendibica, n. sp. Ameiva minor, n. sp. Hersiliodes leggit, n. sp. A. tenwipes, n. sp. H. tamilensis, n. sp. Ceylonia aculeata, n. gen. & sp. HT. dubia, n. sp. Laophonte hirsuta, n. sp. Asterocheres manaarensts, Q. sp. Laophontella typica, n. gen. & sp. A. major, 1. sp. Tetragoniceps dubia, n. sp. : A. minor, 0. sp. LT. minor, n. sp. Asteropontius typicus, n. gen. & sp. Daetylophusia dentata, n. sp. A. attenuatus, n. sp. D. havelocki, n. sp. Collocheres giesbrecht2, n. sp. D. hirsuta, n. sp. Lepeopsyllus typicus, n. gen. & sp. D. ceylonica, n. sp. L. ovalis, n. sp. D. hamiltoni, n. sp. Doropontius denticornis, n. gen. & sp. D. robusta, n. sp. Cletopontius serratus, p. gen. & sp. D. laticaudata, n. sp. ; Stephopontius typicus, n. gen. & sp. D. cemula, n. sp. Chondracanthus cynoglottidis, n. sp. D. platysoma, n. sp. The large majority of these new species were found in the gatherings from the pearl banks in the Gulf of Manaar, where Professor HerpMAN and Mr. HorRNELL were working for some weeks. The dissection and drawing of so many new forms has involved a vast amount of close labour and diligent research, and Mr. THompson must Tse w f po | oe we if ii % ie 4 ; ue ra ase 4s ALS ae a COPEPODA. 229 here be allowed to state that this portion of the work, and indeed the chief part of the laborious examination of the material, was undertaken and has been skilfully carried out by Mr. ANDREW Scort, whose previous experience of this group of animals makes his co-operation invaluable. The species, known and new, from the collection represent the families as follows :— Calanide. . . . . 44 species. Onczeideeye) = seus ee SaSpecies: Centropagides 55. 29 Conyeride ian eas iRseudocyclopideey 9) 1 = ilinchomoloadscaa eyo mee Candacndsseiye 4) 4 LO On ee ee oOo SI Or H bo CO = 25 ae 26 a 26 March 1 . (17 species) April 8~9, 1902. , 1902. or) . Off south bar, Manaar, surface. . Off Manaar Island . . Cheval Paar . COPEPODA. . North of East Cheval Paar (Station LIL) . . 10 miles N. of Cheval, bottonv net, 7 fms. (Sta. LIIL.) South of Adam’s Bridge, 12 fathoms. ee ” 3) be) 99 . Dutch Modragam Paar, surface . Karativo Paar, 6 to 10 fathoms 2. Donnan’s Muttuvaratu Paar, 8 fathoms 3. West of Periya Paar, deep net ; . Vankali Paar, 9 fathoms (phosphorescent) . . South-east of Modragam 6. Off Mutwal Island : . Chilaw Paar (Station LXIX.) . surface . OU 78. Donnan’s Muttuvaratu Paar 79. Mudalaikuli Paar . 80. Talaivillu Paar, all day 81. Navakaddu Paar 2. Galle Somme ebay ss CA eka: DOU 85. oy |) ALIN SGae ee etlarbour 87. a 5 ; 88. 55 3 8 A.M 89. Fe sf 9 A.M 90, a 91 sa De TPBINE, 92. Pearl banks, washed Boat Miedudks ; 93. Galle, 3 p.m ; ee 94. South-east Cheval aan, at oon : 95. Kast Cheval Paar, centre . 96. s a Oia a i 98. Periya Paar Kerrai, aby iene 99, i # night 100. West Cheval NOs 9 ”” . . . . . . O . >~oa> ooo eek on a LPS EF ES EO PS BS ERIS ES ES SS SS SS NS SS SS 5 S58 ss es ee 1G nae 35 be) OM 28 22 Lome 23 Pfs op 17 be) Bey. ANS ins 1B yy 1 NO) op 1 1 Bp ale Bi, WG). Lan wake L me aoFrrre ANwWAmMmwWN PR OO | >» > | 99 2 29 9 be) 3 by) 110% es 9 9? Las 8 9? by) August 10 species) March ») 9? 9) 5) ” 8 (no date) August 12 OV be ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) June ) ) ) ) ) ) ) ) ) ) ) EN ) ) ) ) ) ) ) 11 6 oOo © CO IJ 232 CEYLON PEARL OYSTER REPORT. NOVmePeriva;Paar, nicht... G) 5 % = «5c = apc Sespecics) a Norman OZ NOS South=west, Cheval) tye tn) ce) sre ey eeu eel 02a mee 14 HOA MiMondatcniebaarss+ "ap val ever. lt. Seen, in, ca poem re 17 105. Muttuvaratu Paar . AN Ciscoe eA Te ee) Me 19 106, 3 pearl oy: ster washines Eiganpee ney ee Otog este.) 19 107. Cheval Paar. . . . Seitat it (Ot, Lassinete) Feb. & Mar., 1902. 108. Pearl banks, washings an Gredved debee: Mee (Corer wee 109. Washings from young pearl oysters . . . Ait ea) As 110. “3 , deep water dredgings, Pt. de Galle ( || 111. General washings of dredged Invertebrates . .(41 ,, ) ; 112. Washings from dredgings, G. of Manaar sponges. (13 ,,__) Mi 3 low-netion Marichchukaddi: i) maeniean-e een lal ) Feb. 1, 1903. ase Modragamvbaar, surtaceys ss. =) |. ip asaney eeilDeeee ms) mee 2 115. Karativo, shoal buoy . 2 PUA ieee ior ie AAS Ot) ies 2 LLG, Somlanceeysis Clovavfall leben summers) 5 4 4 5 5 5 (lA 5 \) e 4-5 117. East Cheval, surface . bee aay ee iat ae (2.0 Wot 7 Ss ChovalyPaarnpueerc AEy i 21) ee oe ays be (EL eindssis 1B) ges 9 BO) Wake ie Ieee ea Onlyayounc Cc anise ‘pilgamis March 10 190, = i J Meee tele O. ‘ ei Ait 0p 121. East Cheval Baer sc) Geeks . . . .( 5species) April 18 122. Washings from Cheval Peet nea! oysters Le EA Sane ne DISTRIBUTION OF SPECIES. The Numbers refer to the Stations in tre preceding List. Calanus helgolandicus, 1, 2, 8, 37, 38, 41. » gracilis, 4, 21, 22, 38. » » minor, 2, 3, 4, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 24, 31, 34, 38, 39, 41, 48, 46, 47, 48, 49, 69, 78, 81, 92. aoe, Oh Bh, By MO, May WA WS, WA 1, WA, 17, 1), BN 22, 24 2 28, 29, 30, 31, 32, 33, 34, 42, 43, 47, 49, 51, 52, 54, 55, 56, 60, 62, 63, 64, 65, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 79, 80, 96, 98, 99, 102, 113. » darwini, 5, 9, 10, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 32, 33, 54, 68, 74, 80, 103. » vulgaris, 7, 8, 9,10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22; 23) 2a 27, 28, 29, 30, 31, 32, 33, 34, 42, 44, 45, 46, 47, 49, 50, 52, 5 506s 7, D9, GONG2Z, G3. 64, GoiO6, 67, OSs 69s VON Wi venues 74, 75, 76, 77, 78, 79, 80, 92, 94, 100, 101, 102, 104, 116, 117, 118, 119, 120. COPEPODA. 233 Calanus robustior, 21. Hucalanussattenuacusy 6, 10) 11, 12,13, 14,15, 16, iy, 18, 20, 21, 22,23) 24> 59% 64, 71. “ pileatus, 8, 9, 24, 55. i erassus, 9, 56, 57, 100, 117. sulocmmgsus, 9; 10, 1%, Wil, Be, An, BO, BH, Oi, Gey GG; GO, 7%, 95, 97, 98, 99, 100, 101, ae OAL NOS, WO¢, WH, Wile, al $e subtenuis, 47, 55, 62, 63, 65, 74, 76, 78, 79. i monachus, 46, 79. Rhinealanus cornutus, 13, 14, 15, 16, 17, 18, 19, 56, 57, 78 a nasutus, 14, 15, 17, 18, 20, 21, 56, 64. Mieeymoceralclausiy 7/40) lon14, 15,18, 19920) 21 22% 255274285 29) 30nd oes os Bl By AD GY N's, (BG, Wil, 7, VR. Paracalanus JORUAAUES,, Jy Pay, Gly Cay Oy Oly toy MO, WIR Gy IAEA iy ema ea, ek, Ab 26,27) 29,30) 31,132) 33, 34.35, 42,43, 45, 47, 50/51 52) 53, 55, 56, 58, 59, 60, 64, 65, 66, 68, 69, 70, 71, 72, 76, 78, 7, 80, Bl, OL OR OR, Or Is, Ue hs, ae, aa 118, 121. ¥, erassirostris, 42) 43.4724 50, 51. 55, 63, 65, 68, 69,70, 78) 79) 80; 94, 113. Metacalanus aurivillu, 26, 27, 28, 29, 48, 47, 48, 55, 58, 59, 60, 64, 65, 66, 69, 70, 71, 72, 92, 96, 107, 113, 114, 115, 116, 118, 121. Acrocalanus gibber, 6, 22, 59, 64. , _ longicornis, 7, 8, 9, 10, 11, 13, 15, 16, 18, 24, 28, 32, 34, 42, 43, 56, 58, GO, G0, GS, OF, BA By, Ba 7 We. 7, OL, GG, 107, 114, 115, 117. i CuacilisnmelO nine Oy 20m 21222 OAs es monachus, 27, 29. Calocalanus pavo; 1, 2,354, 7, 8, 11,18, 15, 16, 17, 18, 19, 20, 21, 22; 24, 25, 26% BY, Us 20> BO, B45 BB, Bly D2 ae 69, 72, Le OD, Wc i: plumulosus, 4, 5, 7, 10, 11, 15, 18, 2 222 AR OMe ale Clausocalanus furcatus, 1, 3, 4, 6, 7, 8, 10, 11, 13, 15, 16, 17, - UO) 2X0), Bil, OB. GS. 24, 27, 28, 29, 30, 31, 32, 33, 34, 37, 38, 39, 40, 41, 42, 43, 52, 55, 56, 62, 68, 70, 71, 72, 73, 74, 75, 77, 78. i arcuicornis, 1, 2, 3, 4, 6, 8, 9, 15, 26, 27, 28, 29, 30, 31, 37, 38, 39, 40, 41, 68. Pseudocalanus elongatus, 1, 2, 3, 4, 6. AKtideus armatus, 3, 4, 6. Undeucheta minor, 1, 16, 21. Euchirella rostrata, 21, 23. messinensis, 26, al, 5 234 CEYLON PEARL OYSTER REPORT. Hucheeta marina, U2, 3545 4 Bp Oe On AZ. BAR a> el Gem soul cy eeed og ame Ome ene se 24, 26, 27, 28, 29, 30, 31, 32, 50, 55, 56, 57, 71, 74, 78, 94, 99. ” spinosa, 2, 3, 30. . acuta, 3, 4. Me concinna, 9, 10, 34, 100, 102, 104, 105. a barbata, 28, 29. Scolecithnrix danse; 12) 14, V6.7 819) ZOO Ie 234 26 27 2829 sO eee if bradyi, 3, 14, 15,21. 22, 23. . chelipes, 34. % auropecten, 8. - tenuipes, 8. Ridgewayia typica, n. gen. & sp., 106. Pheenna spinifera, 1, 9, 20. Centropages chierchie, 1, 2, 21, 22, 64. \ typicus, Ziy Bky iif te violaceus, 3, 7, 13, 16, 18, 37, 38, 40, 41, 52, 59. i furcatus, 6, 9, 10, 11, 13, 14, 15, 16, 24, 26, 27, 31, 32, 34, 35, 46, 48, D5, DO, D8), Oa, O44, Ody, WG, (Gs), OO, 725, 773, lS & elongatus, 7, 15, 21, 22, 24, 27, 30, 34. f gracilis, 7, 10, 16, 17, 18, 22, 26, 28, 29, 30, 34, 35, 55, 56. M kroyeri, 13, 14. a calaninus, 15, 17, 18, 19, 20, 21, 26, 27, 56, 59, 72. f orsini, 30, 46, 59, 64, 65, 70, 71, 76, 78, 79, 80. 3 tenuiremis, n. sp., 13, 43, 47, 53, 54, 56, 59, 60, 63, 64, 65, 69, 70, 71, TI IAS IOS 98S 99> 101k LOR 3 dorsispinatus, n. sp., 75. Isias clavipes, 1. Pseudodiaptomus salinus, 5, 6, 7, 35, 36, 37. 5 serricaudatus, Ut, WS, 480953) b4bo. bye oS. 39) uGiena ye (hs, FE, ‘30, Oils D25 WOZ, Uist aurivillii, 47, 48, 59, 60, 65, 66, 69, 80. Temoropia mayumbeensis, 6, 7 Temora longicornis, 1, 4. , discaudata, 4, 5, 6, 8, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23, Bs Ady es BOS Bile BY, SS, Sw, see alse als al aba. 2, Os DG, DG OOH GOs Hilly Osh G45 GH, WS; OS, 69, 70, wil, 7B. A FO, FO, VS, OM; WOO, WO, Wile WG, TMs. , stylifera, 9, 10, 11, 12, 13, 14, 15, 16, 17, 20, 21, 22, 23, 24, 43, 52. , bturbinata, 43, 59, 64, 73, 82. Metridia lucens, 1, 2, 3, 4, 5 bo ~I +e) (oa) Pleuromamma gracilis, 1, 2, 3, 4, 11, 12, 13, 14, 15,.16, 21, 22, 23, 24, 26, ¢ 29, 30, 32, 33, 34, 35, 39. COPEPODA. 235 Pleuromamma xiphias, 1. abdominalis, 3, 4, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 32, 33, 34, 35. Mucteutiaiavicornisml: Quon 4e5" 7. Selon 1a, Jil 22. 2388 96.97 98° DON 3037. 38, 39, 78. Heterorhabdus spinifrons, 3, 11, 13, 14, 16, 21, 22. papilliger, 12. oy Ss abyssalis, 12. Me elausi, 27. Pseudocyclops obtusatus, 15, 108, 122. Candacia armata, 1. sumplexs3. 9s 10) Iie 135, 14) 165 23, 3: 101, 102. re bispinosa, 3, 9, 37. bradyi, 7, 9, 10, 11, 13, 15, 20, 24. truncata, 7, 8, 13, 14, 16, 17, 20, 21, 22, 23, 24, 26, 29, 33, 34, 55, 56, NOO, Wily, catula, 7, 8, 13, 15, 16, 21, 22, 26, 27, 29, 32, 34, 55, 56, 59, 77, 78. longimana, 9, 10, 11. gethiopica, 9, 13, 14, 16, 17, 18, 20, 21, 22, 23, 24, 26, 27, 28, 29, BOs 72% - curta, 9, 10, 11, 14, 56, 99. pachydactyla, IAL 16, Iv, 20, Bi, 24, 23, BO, D8, 72, 745 Calanopia elliptica, 5, 7, 9, 10, 11, 12, 13, 14, 21, 22, 23, 24, 32, 35, 36, 37, 43, 47, 48, 49, 52, 54, 55, 57, 58, 59, 64, 67, 68, 69, 72, 75, 77, 79, 102, 114, 116. minor, 7, 9, 10, 14, 15, 22, 23, 24, 26, 32, 35, 36, 42, 43, 47, 48, 59, 64, 66, 70, 78, 79, 92, 94, 96. be aurivillii, 82, 83, 85, 90, 114, 115, 118, 121. Labidocera acuta, 5, 9, 10, 11, 12, 13, 14, 15, 20, 21, 23, 26, 31, 32, 45, 46, 47, 48, 49, 52, 55, 57, 59, 60, 61, 63, 64, 65, 66, 69, 73, 74, 75, 76, 102, 103, 113, 116, 117. minuta, 9, 12, 13, 14, 15, 16, 31, 33, 48, 46, 47, 48, 55, 59, 68, 71, 73, 98, 99, 100. detruncata, 17, 19, 20, 21,26, 27, 50. " pavo, 46, 50, 51, 53, 54, 55, 57, 58, 59, 60, 61, 65, 93, 98. kroyeri, 45, 46, 57, 65, 98, 99, 100, 101, 102, 103, 117. bo 55, 59, 63, 64, 94, 98, 99, 100, ” iM i var. stylifera, 72, 75, 76, 77, 98. F var. gallensis, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58. . pectinata, n. sp., 48. Pontella danz, var. ceylonica, 46, 57, 60, 63, 65. 2H 2 236 CEYLON PEARL OYSTER REPORT. Pontella fera, 21, 26, 74. ) secuniters 225,46, 59) 160, 62, bass00. se, Wiel OD: PEPUINCe NS MMe , tenuiremis, 49. Pontellina plumata, 7, 9, 14, 15, 21, 22, 23, 26, 27, 28, 29, 30, 33, 52, 72, 76, 97. Pontellopsis krameri, 8, 10, 33, 34. E armata, 23, 75, 76, 77, 80, 94, 96, 98, 100, 103. Jay OF ns regalis, 39, x herdmani, n. sp., 54, 57. 5 strenua, 47, 52, M3 perspicax, 47. Acartia clausi, 1, 2, 4, 5, 59. , longiremis, 1, 2, 3, 4, 6, 36, 37, 38, 39. 3 Chtiloe,, 5, (7, » , erythrea 5, 6,9, 10, 11) 12) 13, 4) 15, 16) 17, 18, 195220) 21 O27 Ale 85, 86, 43, 46, 47, 48, 49, 50, 58, 54, 55, 57, 58, 59, 60, 61, 62, 63, 66, 67, 68, 70, 71, 77, 78, 79, 80, 92, 94, 96, 97, 98, 100, 101, 103. 9 centrura, 5, 8, 49, 50, 58, 55, 58, 93. » nhegligens, 7, 8, 10, 11, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 33, 34, 35, 38, 50, 52. 56, 64, 66, 71, 75, 76, 78, 79, 81, 94, 100, Tortanus gracilis, 6. a forcipatus, 45, 47, 56, Thorellia brunnea, 112. Oithona plumifera, 1, 2, 6, 7, 8, 11, 18, 14, 15, 17, 18, 19, 20, 21, 22, 24, 26, 27, 28, 29, 80, 31, 32, 33, 37, 38, 39, 42, 55, 56, 60, 65, 67, 68, 71, 72, 78, 81, 107, 118. » similis, 5, 6, 7, 10, 14, 15, 17, 19, 20, 21, 22, 23, 24, 35, 36, 38, 42, 43, 47, 52, 56, 57, 58, 59, 64, 65, 66, 67, 68, 69, 70, 71, 78, 80, 81, 92, 113, 114. , _minuta, 13, 14, 18, 19, 20, 22, 25, 26, 27, 28, 29, 31, 45, 46, 47, 50, 51, 52, 58, 54, 56, 59, G1, 68, 64, 65, 66, 67, 69, 71, 78, 79, 80, 81, 114. » Tigida, 25, 26, 82, 42, 43, 52, 54, 58, 59, 62, 64, 69, 71, 72, 78, 79, 96, WO WG, WAU, ISI. » spinifrons, 1, 2, 3, 4, 8, 9, 10, 11, 13, 24. a nana, 47, 114, 115. = setigera, 36, 37, 38, 39, 41. Doropygus pulex Ss EE cies hearoy from Ascidians, Ceylon. ue norman, . = eee ¥ COPEPODA. Botryllophilus ruber, from Sponges, Ceylon. Sunaristes paguri, 111. #) inopinata, n. sp., 111. ne longipes, n. sp., 111. < curticaudata, n. sp., 111, Longipedia coronata, 35, 36, 38, i minor, 113. Canuella perplexa, 5. Hemmosomanaulambicnmy ay 4 oO) vio. LO) WIP T2 eS, Pat ioe siG aly, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, BGs B7/, BO, BO, Zul, 4, Au Zt), AG ali, Dll, D2, 58, 60, 61, 64, 65, 66, 67, 68, 69, 71, 72, 73, 81, 92, 113, 115. _ mosew, Hy B Gy fo Sy LOy Wy ey WAL IB ay, Ali IS) Phil GAR. 26, 28, 29, 30, 31, 32, 33, 34, 35, 37, 42, 43, 45, 53, 54, 56, 5 7, 58, 60, 61, 62, 64, 65, 66, 67, 68, 72, 73, 78, 79, 80, 81, 92, 1114, 115. normani, 106, 111. if ee LOG, WU Sevellayenaciisy 36.07, Syl, 13) 14 ld) 16 soy Qi 22238245 29), a GA, 5, 27. 8G, GB, 4, Bl, so, BB. BG, FO, Ge, GH (3, 13, 2, HO, Gil, WILD, WiiKey, IIL, Miracia efferata, 19, oe Ae AGe ee minor, 1, 13, 1 Euterpina acutifrons, 7 2, Bi) Ae Dy By Hg On abd Ps 36, BY), 46, 46, 4:7, 23, Ol, O4, bal, HO, 13, 14, 15, 18, 57, 25, 58, 8, 19), 20, 33, 34, 35, 54, 56, 57, 78, 79, 80, 23, 24, 25, 46, 48, 52, ao), 70, Wi, Wi). BO, Bi, 66, 71, 72, 29, 32, 35, 59, 60, 61, 63; 64, 66, 67, 68, 69, 73,975) 80,92) 113, Ilse 116, 1ilz eine! Tachidius littoralis, 6. Clytemnestra scutellata, 11, 12, 13, 14, 15, 18, 19, 21 we rostrata, 15, 16, 27, 28, 30, 31, Tegastes spheerica, 5, 48 nigrans, 106, imthurni, n. sp., 106. ke donnani, n. sp., 106. s twynami, n. sp., 106. im chalmersi, n. sp., 106. Stenhelia brevicornis, n. sp., 106. “5 eracilicaudata, n. sp., 106. i longicornis, n. sp., 106. m perplexa, n. sp., 106. a dentipes, n, sp., 106. Bana, 716: 22, 24, 56 62, 118. 238 CEYLON PEARL: OYSTER REPORT. Stenhelia minuta, n. sp., 106. x knoxi, n. sp., 106. Parastenhelia hornelli, n. gen. & sp., 106, 110. Bs similis, n. sp., 106. Ameira minor, n. sp., 106. , benuipes, n. sp., 106. Ceylonia aculeata, n. gen. & sp., 109, 110. Laophonte serrata, 106, 111, 112. i inornata, 106, 111. He hirsuta, n. sp., 106, 111, 112. Laophontella typica, n. gen. & sp., 108. Cletodes linearis, 5, 106, 111, 112. Tetragoniceps dubius, n. sp., 106. & minor, n. sp., 106. Dactylophusia tisboides, 5. iy latipes, 108. os dentata, u. sp., 106. havelocki, n. sp., 106. a hirsuta, n. sp., 106. va ceylonica, n. sp., 106. a hamiltoni, n. sp., 106. em robusta, n. sp., 106. « laticaudata, n. sp., 106. is zmula, n. sp., 106. platysoma, n. sp., 106. Thalestris mysis, 5, 106. Pseudothalestris imbricata, 106. Harpacticus chelifer, 113. Peltidium ovale, n. sp., 106. Fs angulatum, n. sp., 106. speciosum, n. sp., 106. serratum, n. sp., 98. 4 perplexum, n. sp., 106. Ilyopsyllus affinis, 5, 43, 57, 58. Porcellidium fimbriatum, 106, 111. ae brevicaudatum, n. sp., 106, 111. ee acuticaudatum, n. sp., 106. 53 ravane, n. sp., 106. Idya furcata, 1, 3, 5, 6, 7, 40, 41. ,», longicornis, 111. Pseudanthessius gracilis, 108. COPEPODA. 239 Pseudanthessius maximus, n. sp., 86. chelifer, n. sp., 108, 111. concinnus, n. sp., 108. Hi liber, 111. Lichomolgus minor, 5, 109, 111, 113. gracilis, n. sp., 111. 9 be) leversi, n. sp., 106, 111. lankensis, n. sp., 111. buddhensis, n. sp., 111. s simplex, n. sp., 112. is elegans, n. sp., 111. be robustus, n. sp., 111. as gigas, n. sp., 111. Le) dentipes, n. sp., 111. Paralichomolgus curticaudatus, n. gen. & sp., 111. us longicaudatus, n. sp., 111. Hermannella arenicola, 106, 109, 111. es robusta, n. sp., 111. 3 serendibica, n. sp., 112. Hersiliodes leggii, n. sp., 112. i tamilensis, n. sp., 106. a dubia, n. sp., 5. . Oncea venusta, 1, 2, 3, 4, 7, 8, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 36, 37, 38, 52, 55, 56, 66, 68, 71, 72, 73, 74, 80. media, 1, 2, 3,6, 7, 12 13) 14, 17, 19, 20) 21, 79, 114, 115, 116, 118. Peeesubtiliss les. 4: munuta, 1, 2, 3, 4, 6, 7, 10, 14, 15, 16, 17, 19, 25, 26, 28, 29, 31, 32, 34, 35, 38, 39, 42, 43, 50, 55, 63, 65, 78, 92. mediterranea, 1, 4, 5, 7, 8, 9, 10, 11, 12, 13, 16, 18, 22, 28, 24, 37, 78, 80. », hotopus, 5. , conifera, 13, 15. Lubbockia squillimana, 6, 8, 10, 28, 32. Conyecusivenusuus, 1) 2,.3:°4,°5, 6, 8, 10) Ill, 12,114, 15, 16, 195.20, 215 227 9304 25, 27, 28, 29, 30, 42, 46, 47, 48, 50, 55, 56, 59, 60, 62, 64, 65, 66, 67, 69, 72, 78, 81. os rostratus, 2, 4, 38, 39, 40. dane, 3, 8, 10, 11, 13, 14, 15, 16, 17, 18, 19, 22, 23, 24, 26, 27, 31, 52, 55, 64, 65, 67. i furcifer, 3,4, 17, 19, 55, 62, 73,76, 77. * flaccus, 3, 4, 15, 37, 38, 39, 41. 240 CEYLON PEARL OYSTER REPORT. Coryceus elongatus, 3, 7, 8, 22. ss speciosus, 4, 5, 8, 9, 10, 11, 13, 14, 15, 16, 19, 22; 30, 31, 32, 42, 55, 59, 68, 78. , lubbockii, 4, 11, 37, 39, 43, 47, 56, 64. - Carimatis Aso O22 a9) . ovalis, 4, 10, 11, 13, 14, 16, 21, 23, 24, 26, 29. , obtusus, 5, 8,.9, 10, 11, 13, 14, 15, 18, 19, 21, 22, 32, 38, 42, 43, 45, 46, 47, 48, 50, 51, 59, 60, 61, 64, 65, 66, 67, 68, 72, 73, 78, Tile We is gibbulus, 6, 7, 8, 9, 10, 11, 18, 14, 15, 16, 17, 18, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 69, 70, 71, 72, 78, 80, 81. ” longistiliss 778, ll, toon 4S lon limbo, Us Concimmiss 3.05) Geli Wi8se2 Ose 2-1 one Onaeie Gil, 72s ae eracilicaudatus, 13, 14, 15, 18, 19, 21, 22, 25, 26, 52, 58, 71, 73. a robustus, 15. a tenuis, 15, 42, 65. . longicaudis, 78. Copilia mirabilis, 7, 8, 9, 10, 15, 16, 17, 19, 20, 25, 94. Sapphirina ovatolanceolata, 3, 4, 8, 9, 10, 138, 14, 15, 17, 19, - gastrica, 9, 11. " ovalis, 12, 67. hs nigromaculata, 14, 15, 21, 22, 23, 29. 59, 115 . metallina, 17. i salpee, 18, 101. 5 auronitens, 21. “i bicuspidata, 23. as intestinata, 25. . sinuicauda, 74. Asterocheres stimulans, 111, 112. us dentatus, 111, 112. * minutus, 111, 112. 3 manaarensis, n. sp., 112. major, n. sp., 110. mn minor, n. sp., 112. Asteropontius typicus, n. gen. & sp., 112. a attenuatus, n. sp., 111. Collocheres giesbrechti, n. sp., 111. 23, 24, 26, 27, 28, 23, 24, 26, § 27,2 52, 53, 55, 56, 57, 4 19, 20, 22, 23, 24 43, 52, 55, 56, 57, 90 91 99 « 20, 21, 22, 2 28, 29, 30, 52, to 7, 28, 29, 32, 33, 205 29 alive COPEPODA. 241 Scottocheres elongatus, 111. a longifurea, 111. Lepeopsyllus typicus, n. gen. & sp., 106. i ovalis, n. sp., 111. Doropontius denticornis, n. gen. & sp., 111. Cletopontius serratus, n. gen. & sp., 111. Stephopontius typicus, n. gen. & sp., 111. Bradypontius siphonatus, 111. Artotrogus orbicularis, 111. Bomolochus scomberesocis. Nua :, unicirrus. Caligus dakari. » diaphanus. », benedeni. Lepeophtheirus thompsoni. r Fish Parasites. Chondracanthus cornutus. cynoglottidis, n. sp. Brachiella thynni. i merluccil. Anchorella uncinata. J COPEPODA. Famity: CALANIDZ. Calanus helgolandicus (CLAUS). One of the commonest northern species. Taken at 6 stations in this collection, but not further south than the Mediterranean. Calanus gracilis, DANA. Less common than the preceding species, occurring at 4 stations, but similar in distribution. Calanus minor (CLAUS). Common throughout the route traversed, from the Mediterranean to the Indian Ocean, occurring at 33 stations. Calanus pauper, GIESBR. Taken at 58 stations; distribution similar to that of the last species. Calanus darwini (LupBsock). Less plentiful than the two preceding species, occurring at 27 stations, from the Red Sea southwards through the Indian Ocean. 21 242 CEYLON PEARL OYSTER REPORT. Calanus vulgaris (DANA). The most generally distributed of any species throughout the route traversed, occurring at 70 stations, from the Red Sea southwards. Calanus robustior, GIESBR. Only once taken, at Station 21, off Minikoi, in the Indian Ocean; previously known from the Atlantic and Pacifie Oceans. Kucalanus attenuatus (DANA). Occurred plentifully at 18 stations, from the Red Sea southwards through the Indian Ocean to Ceylon. Eucalanus pileatus, GIESBR. Taken at 4 stations only, twice in the Red Sea and twice in the Indian Ocean, which adds to its hitherto known distribution in the Atlantic and Pacific. Eucalanus crassus, GIESBR. Occurred once in the Red Sea and at 4 stations round Ceylon; previously reported from, the Indian Ocean. Eucalanus subcrassus, GIESBR. Occurred at 27 stations; twice in the Red Sea, and throughout the Indian Ocean. Eucalanus subtenuis, GIEsBR. A few specimens were found from 9 stations, all in the sea round Ceylon. Eucalanus monachus, GIEsBR. A rare species hitherto known only from the Mediterranean. Specimens were found, off Ceylon, at 2 stations, thus extending its known range to the Indian Ocean. Rhincalanus cornutus (Dana). Reported from 10 stations, all in the Indian Ocean. Previously known from the Mediterranean, the Atlantic, and the Pacific. Rhincalanus nasutus, GIESBR. Similar in distribution to the last species. Occurred at 8 stations in the collection. Mecynocera clausi, |. C. THomPson. - Found at 27 stations, extending from the Red Sea throughout the Indian Ocean, the latter being an addition to its hitherto known distribution. COPEPODA. 243 Paracalanus parvus (CLAUS). One of the most widely distributed species throughout the regions traversed. Occurred at 65 stations, extending from the British coasts to the Ceylon pearl banks. Paracalanus crassirostris, F. DAHL. . Found at 16 stations, all in the sea round Ceylon; not previously known from the Indian Ocean. Metacalanus aurivillii, CLeve—Plate I1., figs. 18 to 20. Occurred at 27 stations, all in the sea round Ceylon ; previously known only from the Malay Archipelago. We show the female abdomen and the male and female fifth natatory legs of this species, as they are not represented in sufficient detail by CLEVE, Acrocalanus gibber, GIESBR. Found sparingly at 4 stations, from the Gulf of Suez and Indian Ocean. Acrocalanus longicornis, GIESBR. A much commoner species than the preceding, occurred at 33 stations, extending from the Red Sea throughout the Indian Ocean and around Ceylon. Acrocalanus gracilis, GIESBR. Occurred at 9 stations; general distribution similar to that of the two preceding species. Acrocalanus monachus, GIESBR. A few specimens of this rarer form were found at 2 stations between Minikoi and Sokotra. Previously known from the Pacific and Indian Oceans. Calocalanus pavo (DANA). This beautiful species, easily recognised by its elegant plumose furcal setze, although rarely found perfect, has a wide range throughout the Atlantic, Pacific and Indian Oceans, and occurred at 33 stations, extending from Gibraltar through the Mediterranean, Red Sea, Indian Ocean, and around Ceylon. Al Calocalanus plumulosus (CLAvs). Similar in distribution to the last species, but less common. It occurred |, at 12 stations. Clausocalanus furcatus (Brapy). Well distributed throughout the entire traverse, occurring at 47 stations. Ze Lee “a 244 CEYLON PEARL OYSTER REPORT. Clausocalanus arcuicornis (DANA). Rarer than the preceding species, but similarly distributed. It occurred at 20 stations. Pseudocalanus elongatus (Borck). One of the commonest British species; occurred at 6 stations, extending as far south as the Gulf of Suez. Aitideus armatus, Brapy. A species widely distributed throughout the Atlantic, Pacific and Indian Oceans, but only taken at 3 stations in this collection, from the Mediterranean to the Gulf of Suez. Undeuchata minor, GiEspr. Occurred off Gibraltar, and at 2 stations in the Indian Ocean; the latter are additions to its hitherto known range. Huchirella rostrata (CLavs), Oecurred twice in the Indian Ocean. Euchirella messinensis (CLAUS). Only once taken, off Minikoi, west of Ceylon, thus considerably extending its southern range; the Mediterranean and the Gulf of Gascony being the only previous records. Eucheta marina (PRESTAND.). A commion ocean species; occurred at 36 stations, extending throughout the entire traverse. Eucheta spinosa, GiEspr. Found very sparingly off Gibraltar and in the Mediterranean, and again off Ceylon; not previously reported from the Indian Ocean. Eucheta acuta, GIESBR. Taken at 2 Mediterranean stations, between Messina and Port Said. Eucheta concinna, Dana. Occurred at 3 stations in the Red Sea and at 4 stations round Ceylon. Eucheta barbata, Brapy. Occurred at 2 stations in the Indian Ocean near Ceylon. Known previously only from the Atlantic. COPEPODA. to ie on Scolecithrix danz (LuBsock). Taken at 18 stations in the Indian Ocean and round Ceylon. Scolecithrix bradyi, GrEsBR. Occurred once in the Mediterranean, and at 6 stations in the Indian Ocean, the latter being an addition to its known range. Scolecithrix chelipes, GiEsBR. Taken only at one station, in the Red Sea, its only known habitat. Scolecithrix auropecten, GIESBR. A rare species—was found in the Red Sea, an addition to its known range in the Mediterranean and Atlantic. Scolecithrix tenuipes, ‘I. Scorv. Like the preceding species, this was found in the Red Sea, its only previously known habitat being the Gulf of Guinea. Ridgewayia, n. gen. Body cyclopoid in form, 6 cephalothoracic segments well defined. Abdomen 4-jointed, anterior antennee 25-jointed. Posterior antennze 2-branched, the outer branch consisting of 2 joints, the imner branch of many joints and longer than the outer. Mouth organs very similar to those of Calanus and Temora. Outer and inner branches of ist to 4th natatory legs all 3-jointed. Outer branch of 5th pair 3-joimted ; inner branch 2-jointed. The male of the one species occupying this genus being unknown, it is not easy to fix with certainty the exact systematic position. In the anterior and posterior antenne, as well as in the mouth organs of the female, it closely resembles the Calanine. In the segmentation of the first 4 pairs of natatory legs it agrees with Calanus, but not in the 5th pair. On the whole we think that the position of the genus should be amongst the Calanide. At the suggestion of Professor HeERDMAN we have named this genus in honour of Sir West Rinceway, who was Governor of Ceylon when the pearl oyster investigation was carried on. Ridgewayia typica, n. sp.—Plate L., figs. 1 to 13. Length, female 0°85 millim. ; male unknown. Cephalothorax 6-jointed, the cephalic segment equal in length to the four following combined, ‘The 5th thoracic segment has a strong hook pointing downwards on its ventral surface. Rostrum short, broad and pointed. Abdomen 4-jointed, the genital segment very wide aud equal in length to the following two united ; it bears a similar hook to that of the last thoracic segment on its right side posteriorly, Furcal rami about twice as long as broad, each bearing 4 long terminal setee. 246 CEYLON PEARL OYSTER REPORT. Anterior antennze 25-jomted, nearly equalling in length the cephalothorax. The proportional lengths of the joints are as follows :— 1 284. 6 89, 10) du, [3nd lp, 16. U7, UBe 20) aie eees 15.207. 707.7. 7.7.72 7. 7. 7% 8.8 8 9. Shawnee tae cee om Posterior antennze 2-branched, the outer branch consisting of 2 joints, the mimer of 8, the 2 basal and the apical joints being each about double the length of the intermediate ones. Mandible broad with 9 or 10 small teeth, palp 2-branched, one branch having 2, the other 4 jomts. Maxilla well developed, inner branch composed of 2 large setiferous digits. First and second maxillipeds similar to those of the Jalanidee. Natatory legs 1 to 4 with outer and inner branches all 3-jointed, the Jateral and terminal spines destitute of serrations and hairs. The inner branch of 5th pair is 2-jointed ; the outer branch 3-jomted, bearing lanceolate spines with serrated edges; the 3rd joint is attached to the centre of the 2nd joint. _-Two specimens, both females, were found in the Muttuvaratu pearl-oyster washings. This, the only known representative of the genus /iidgewayia, is easily recognised by the inner branch of the posterior antennze, by the hooks on the last thoracie and genital segments, and by the 5th pair of natatory legs. Phenna spinifera, CLAUs. Occurred at 3 stations, near Gibraltar. in the Red Sea, and in the Indian Ocean. FamILy : CENTROPAGID 2. Centropages chierchiz, GIESBR. Occurred at 5 stations, near Gibraltar, in the Indian Ocean, and about the Cheval Paar and other pearl banks, Ceylon. Not previously reported from the Indian Ocean. Centropages typicus, KROyER. A well-known northern species, common around the British coasts. Occurred at 3 stations in the Mediterranean. Centropages violaceus, CLAUS. Found at 11 stations, extending from the Mediterranean to the Red Sea, and throughout the Indian Ocean. Centropages furcatus (DAN). One of the commoner species of this genus. Occurred at 29 stations, from the Red Sea throughout the Indian Ocean. Centropages elongatus, GIESBR. Found at 8 stations, from the Gulf of Suez throughout the Indian Ocean. COPEPODA. 247 Centropages gracilis (DANA). Occurred at 14 stations, the range being much the same as that of the preceding species. Centropages kroyeri, GIESBR. Found twice in the northern Indian Ocean, in the vicinity of Socotra. .The western Mediterranean appears to be its only previously known habitat. Centropages calaninus (DANA). Occurred at 11 stations in the Indian Ocean. Centropages orsini, GIESBR. This, like the preceding species, occurs at 11 stations, all in the Indian Ocean. Centropages tenuiremis, n. sp.—Plate I., figs. 14 to 18. Length, female 2-0 millims. ; male 1°8 millims. Body somewhat angular, widest anteriorly, slightly tapering to last segment of thorax, which is terminated by long outwardly extended lateral acute projections. Anterior antennze of female 24-jointed, the proportional lengths being as follows :— ll, Bo & 4 O Os 7% & G WO, Wil, WH We We, WH, Wes U7, Weasley BOs Billy WH, Bal, Wet B 4D, Be BB Wy ah Boe eae a Ge yas ah) Aten asin aie) Telos Oana Ds Male right antenna 24-jointed; joints 13 to 17 are considerably thickened; a geniculation occurs between the 18th and 19th joints. Abdomen of female 4-jointed, of male 5-jointed, the last one very small. Furcal ramus sub-linear, the length about three times the width. Terminal caudal setze in the female have the basal portion thickened, The basal joint of the right 5th natatory leg in the female is acutely produced on the inner side and bears three rows of minute teeth. The 5th legs in the male are in general similar to those of C. typicus, as are the other appendages not alluded to. Large numbers of specimens, both male and female, were found at 21 stations round Ceylon. The acute lateral terminal thoracic spines, the 5th natatory legs in the female, and the abdomen and fureal rami are the distinguishing features of this species. Centropages dorsispinatus, n. sp.—Plate I., figs. 19 to 25. Length, female 1°37 millims. ; male 1°24 millims. Cephalothorax ovate, the posterior segment having a rounded acute terminal projection. Rostrum short, broad and triangular. A remarkable curved beak-like hook adorns the median dorsal line of the posterior edge of the cephalic segment. Anterior antennz of the female 24-jointed, the proportional lengths being as follows :— pene On 7.10. 95 LO; 1 12. 13. 14. 15. 16. 170882 j)19520..01:592) 23.524. Sree eb eA Sy De Dr Oe Oy 6. By 6G... 5. 4) Bi Bue, 248 CEYLON PEARL OYSTER REPORT. The 2nd, 5th, 10th and 11th joints bear spinous projections, Male right anterior antennee 23-jointed, with a geniculation between the 18th and 19th joints. Abdomen of female 4-jointed ; of male 5-jointed, the last jomt very small. Furcal rami slightly curved inwards, about twice as long as the width. Fifth natatory legs attenuated ; the second joint of right leg in female has a long plain projecting spine on inner side. The chela of the male right natatory leg is clothed with short hair on the outer side. The other appendages are similar to those of C. typicus. A number of specimens, male and female, were taken in Palk Straits, Ceylon. The species is easily distinguished by the median dorsal cephalic hook, and by the 5th pair of natatory legs and the abdomen and furcal rami, Isias clavipes, Borck. This British species was only taken once, in the first gathering, It ranges to the Mediterranean and Atlantic Ocean. Pseudodiaptomus salinus, Grespr.—Plate IL., figs. 21 to 23. Occurred at 3 stations in the Gulf of Suez and at 3 stations in the Indian Ocean, its only previous record being from the Red Sea. GIESBRECHT’S specimen was a female, the male remaining unknown until now; we have the satisfaction to record it from the same stations at which the females were found. The male measures 1°25 millims., and its characters are shown by figs. 22 and 23, on Plate II. The female also measures 1:25 millims,, and its fifth pair of legs are shown at fig. 21, Plate IT. Pseudodiaptomus serricaudatus (T. Scorr). Occurred at 20 stations throughout the Indian Ocean and about Ceylon. Vv Pseudodiaptomus aurivillii, CLeve—Plate II, figs. 24 to 26. Found at 8 stations in the Indian Ocean. Fortunately the specimens include the male hitherto unknown. The female measures 1:2 millims. and the male 93 millim. The characteristic appendages of both sexes are shown by figs. 24 to 26, on Plate II. —_—— Temoropia mayumbensis, T. Scorr. Two records for this rare species were added in the Gulf of Suez. The Gulf of Guinea is its only previously known habitat. Temora longicornis (MULLER). This common British species was found at 2 stations, from the English Channel to the Mediterranean. Temora discaudata, GIESBR. One of the most widely distributed species throughout the regions traversed. COPEPODA. 249 Occurred at 60 stations, from the Mediterranean southwards, throughout the Indian Ocean, and round Ceylon. Temora stylifera (Dana). Occurred at 16 stations, from the Red Sea southwards, through the Indian Ocean, and about Ceylon. Temora turbinata (Dana). Occurred first in the Gulf of Manaar, and at 4 other stations about the Ceylon Pearl Banks. Has been previously reported from the Pacific, New Zealand, and the Gulf of Guinea, but not from the Indian Ocean. Metridia lucens, Borck. Fairly common, from the English Channel, through the Mediterranean, and as far as the Gulf of Suez, but not further south. Both the latter localities are an extension of its known range of distribution. Pleuromamma gracilis, CLAus. Occurred at 24 stations, from the English Channel onwards to the Indian Ocean, and in the open sea around Ceylon. Pleuromamma xiphias, GIESBR. This was taken in the first gathering only, probably near Gibraltar. Its previously known range includes the Atlantic, Pacific and Indian Oceans. Pleuromamma abdominalis (LuBBock). Found at 28 stations, from the Mediterranean to the Indian Ocean, as far as Ceylon. Lucicutia flavicornis (CLAUS). Occurred at 21 stations, extending from the English Channel to the Indian Ocean, as far as Ceylon. Heterorhabdus spinifrons (CLAUvs). Found once in the Mediterranean and again at 4 stations in the Indian Ocean and twice off Minikoi, near Ceylon. Heterorhabdus papilliger (CLAUs). Heterorhabdus abyssalis (G1EsBR. ). Heterorhabdus clausi (GIESBR. ). The above three species were each taken once only. The two former between Perim and 200 miles into the Indian Ocean—the latter near Minikoi. Each record is an addition to the known distribution of the species. 2K 950 CEYLON PEARL OYSTER REPORT. FamMiIty: PSEUDOCYCLOPID Z. Pseudocyclops obtusatus, Braby and Roperrson. A few specimens only were obtained in the northern Indian Ocean and about the pearl banks and Cheval Paar, Ceylon. The British coast appears to be the only previously recorded habitat. Famity: CANDACIID AS. Candacia armata (Boxcr). Taken only in the first gathering, between the English Channel and Gibraltar. It is probable that the tropical records of this species, long known as C. pectinata. Braby, refer to other Candacias, as more than one species is included in the figures of C. pectinata in the Report on the “ Challenger” Copepoda, but none of them are identical with Borcr’s CL armata. Candacia simplex (GIESER. ). Occurred at 19 stations, from the Mediterranean onwards through the Indian Ocean and at several of the Ceylon stations. Not before recorded from the Indian Ocean. Candacia bispinosa (CLAUs). Found on three occasions in the Mediterranean and the Red Sea. Previously reported from the Indian Ocean. Candacia bradyi, A. Scott. Occurred at 8 stations, extending from the Gulf of Suez into the Indian Ocean. Mr. Scorr’s previous record was from Aden. It is probable that some of the previous records of C. pectinata from tropical seas are really this species. Candacia truncata (Dana). Occurred at 18 stations, from the Gulf of Suez onwards through the Indian Ocean to Ceylon. Candacia catula (GIESER. ). Occurred at 17 stations, the range being similar to that of the preceding species. Candacia longimana (CLAUus). Obtained at 3 stations only, from the south of the Red Sea and from Perim into the Indian Ocean. Candacia «thiopica (Dana). Range of this species is similar to that of C. catwla; obtained at 17 stations. COPEPODA. 251 Candacia curta (DAN). Of similar range to the last species, but less plentiful ; was found at 6 stations. Candacia pachydactyla (Dawa). Obtained at 11 stations in the Indian Ocean and round Ceylon. Famity : PONTELLID. Calanopia elliptica (DAN). Taken between Port Said and Suez and then fairly continuously through the Indian Ocean and round Ceylon. Occurred at 37 stations. Calanopia minor, A. Scort. Of similar range to C. elliptica—occurred 25 times. Calanopia aurivillii, CLEVE. Obtained at 4 stations in the vicinity of Galle and at 4 on the pearl banks. CLEVE’s specimens were from the Malay Archipelago. Labidocera acuta (DAN). Common from Port Said throughout the Indian Ocean and round Ceylon— occurred at 39 stations. Labidocera minuta, GIESBR. Occurred first at the southern end of the Gulf of Suez and then at 20 stations throughout the Indian Ocean and round Ceylon. Labidocera detruncata (Dana). Occurred at 7 stations in the Indian Ocean, and also found at Back Bay, Trincomalee. Labidocera pavo, GIESBR. Obtained at 14 Ceylon stations. Known previously only from the Red Sea, Labidocera kroyeri (Brapy). Similar in distribution to last species; obtained at 11 Ceylon stations. Labidocera kroyeri (Brapy), var. gallensis, nov.— Plate IL., figs. 6, 7. Male differs from L. kroyeri in several particulars. The posterior thoracic segment in this variety is rounded at base, and has a trifid projection on the left side instead of a bifid one as in ZL. kroyeri. The 1st abdominal segment has a long narrow spine on its right basal corner. The end of basal portion of the claspers in the 5th natatory . legs is very short and the chela more spinous than that of ZL. kroyeri. In other respects there is a close similarity between the species and this variety. Taken in surface tow-nettings from Galle Harbour and elsewhere, Ceylon, 2K 2 252 CEYLON PEARL OYSTER REPORT. Labidocera kroyeri (BRADy), var. stylifera, nov.—Plate IL, figs. 8, 9. Male differs from L. kroyeri like the variety gallensis in the last thoracic segment and in the 5th natatory legs. The basal portion of the latter is produced into a long rod-like projection. Several specimens were taken at different stations round Ceylon. Labidocera pectinata, n. sp.—Plate IL, figs. 10 to 14. Length, female, 2°1 millims. Male unknown. Cephalothorax 5-jointed, robust in centre, slightly tapering towards each end, the terminal segment having strong lateral spinous projections. Rostrum short, bifid at apex. Anterior antennze 23-jointed, in length about equal to the cephalothorax. The relative lengths of the joints are as follows :— 1 2.3. 4,5, 6.7.8. 9. 10; 11, 12) 13, 14, 15, 16s 8. 19s 6/6) 2 oN WaNyANeNs 5! We. Tomild, ie) 16) Tee aos oOo Posterior antennze and mouth organs and Ist to 4th pairs of natatory legs as in the other members of this genus. Abdomen 3-jointed, about one-third as long as the cephalothorax ; the right basal extremity of the genital segment is produced into two curved spines; the middle joint bears a knobbed protuberance. The furcal rami are slightly asymmetrical, the right one being nearly half as large again as the left ; the inner side of each is lined with fine hairs; each furca terminating in five short sete. Fifth natatory legs, each composed of two 1-jomted branches, asymmetrical, the inner branches being differently denticulated ; both branches of the left leg are larger than those of the right. The characters of the abdomen and 5th natatory legs are unlike those of any other species known to us. Four specimens, all females, were taken in Palk Straits, Ceylon. Pontella fera, DANA. Found at 3 stations, viz., twice off Minikoi, Indian Ocean, and at Vankali Paar, Ceylon. Pontella securifer, BRADY. Taken off Minikoi, Indian Ocean, and at 10 stations round Ceylon. Pontella princeps, DANa. Was found once only, at Chilaw Paar, Ceylon. Pontella tenuiremis, GIEesBp. Was found once only, in Palk Strait, Ceylon. GIESBRECHT’s specimen was from the Pacific Ocean. Pontella dane, var. ceylonica, nov.—Plate IL, figs. 1 to 5. Length, female 3:4 millims. Cephalothorax of nearly the same width throughout, in this respect differing from COPEPODA. 253 P. dane, which tapers gradually from the second to the posterior thoracic segment. Rostrum nearly straight, length about double the width, and has bifid apex. Fifth natatory legs asymmetrical, the left having outer and inner branches larger than the right branches ; the outer one has a large and small spine on the outer side. First joint of abdomen somewhat globular, whereas that of P. dan@ is more quadrate. A number of specimens, all females, were found at 5 stations around Ceylon. The 5th natatory legs and the shape of the abdomen serve to distinguish the variety from P. dane, GIESBRECHT. Pontellina plumata, Dana. Occurred at 17 stations, south of Gult of Suez, in the Indian Ocean, and round Ceylon. Pontellopsis armata (GIESBR. ). Occurred first between the Maldives and the Gulf of Manaar, and then at 9 Ceylon stations. Previously known from the Pacific and Indian Oceans. Pontellopsis krameri (GIESBR. ). Occurred at 4 Red Sea stations. GIESBRECHT’S specimens were also from the Red Sea. The species has been recorded from Fortescue Strait by A. Scorr. Pontellopsis regalis, DANA. The only specimen of this species was taken in the Mediterranean, near Messina. Pontellopsis strenua (Dawa). Found only at Cheval and Periya paars, Ceylon. Pontellopsis perspicax (Dana). Like the last species, this was only taken on the Cheval and Periya paars. Pontellopsis herdmani, n. sp.—Plate IL., figs. 15 to 17. Length, female 1°9 millims. ; male unknown. Cephalothorax about twice as long as its breadth, having 5 segments, the posterior segment terminating on each side with a triangular acuminated spine. Rostrum long, narrow, and bifid. Anterior antennz 16-jointed, the relative lengths of the joints : oO Ono. or) LOM 2: Area BoE iG: being as follows: —— == - — CREROS eon Om Ooh Onn OrinO.) 1G. sve 0.0010. Posterior antennze, mouth organs and 1 to 4 pairs of natatory legs as in the other species of Pontellopsis. Abdomen about half the length of the cephalothorax, composed of 2 joints, the first being about double the size of the second and having 2 thorn-like projections on the right side. Furcal rami twice as long as broad, with fine hairs on the inner surface and each terminating in 5 short non-plumose setee. 254 CEYLON PEARL OYSTER REPORT. Fifth pair of natatory legs each 2-branched; each branch composed of one hifid joint, the outer branches each having 3 small spines on outer edge. A few females were found in Galle Harbour and also off Karativo Island in the Gulf of Manaar. The abdomen and 5th natatory legs distinguish this from any other described form. We have peculiar pleasure in naming it after Professor HeERDMAN. Acartia clausi, GIESBR. A common British species. Occurred at the first 4 stations as far as the Gulf of Suez, and once off Ceylon at the south end of the Cheval Paar. Acartia longiremis, Liv. Taken at 9 stations, from the English Channel to the Mediterranean off Messina. Acartia dubia, T. Scort. Found in the Suez Canal and in the Red Sea. Acartia erythrea, GIESBR. Well distributed throughout the traverse, occurring at 53 stations, from the Gulf of Suez, throughout the Indian Ocean, and around Ceylon. Acartia centrura, GIESBR. Occurred in Gulf of Suez and the Red Sea, and at 6 stations round Ceylon. Previously reported from the Red Sea and Atlantic Ocean. Acartia negligens, DAna. Obtained at 38 stations, from Gulf of Suez onwards through the Indian Ocean, and common around Ceylon. Tortanus gracilis (BRapy). One record only from about the Gulf of Suez. Brapy records the species from the Philippine Islands. Tortanus forcipatus (GIESBR. ). Occurred at 3 Ceylon stations only, viz., off Kalpentyn Island, Cheval and Periya paars, and off Pantura, south of Colombo. GTESBRECHT’S specimens were from Amoy, China. FAMILY : CYCLOPIDA. Thorellia brunnea, BoEcK. Found in washings from sponges, Gulf of Manaar, COPEPODA. 2 Or ov Oithona plumifera, Barrp. A common species, recorded from 40 stations almost continuously throughout the seas traversed. Oithona similis, CLAus. Commencing at the Gulf of Suez, this species occurred at 38 stations ; similar in distribution to O. plunifera. Oithona minuta, ‘I’. Scort. This species, first recorded from the Gulf of Guinea, appears to be abundant throughout the Indian Ocean and round Ceylon, occurring at 35 stations. Oithona rigida, Girspr. Occurred in the Red Sea, about Minikoi, and at 18 stations around Ceylon. Oithona spinifrons, Borck. This common British species, closely allied to O. s¢malis, occurred in the earlier gatherings, and in the Red Sea and Northern Indian Ocean, to Ceylon. Oithona nana, GIEesBR. Occurred at 3 stations on the Pearl banks, Ceylon. Oithona setigera, DANA. Taken on 4 occasions in the Mediterranean and once in the Suez Canal. Famity: ASCIDICOLID. Doropygus normani, Brapy. A few specimens were taken from the branchial sac of a species of Cynthia found at the Aripu reef, Gulf of Manaar. Doropygus pulex, ‘l'HORELL. Found attached to the branchial sac of a species of Molgula, from the Cheval and Periya paars, Ceylon. Botryllophilus ruber, Hesse. Found in washings from sponges, Gulf of Manaar, Famity: HARPACTICID s. Sunaristes paguri, Hessp. A few specimens were found in the general washings from Ceylon Invertebrates. 256 CEYLON PEARL OYSTER REPORT. Sunaristes inopinata, n. sp.—Plate III., figs. 1 to 8. Length, male 1°3 millims. ; female 1°5 millims. Body resembling S. pagwi7, but all the segments broader in proportion to length. Anterior antennee of female 6-jointed, densely covered on the upper side with plumose sete and bearing two long club-like appendages, possibly olfactory. ee Gp 2 db (a WAV fo ta Ds 2h il), Anterior antennee of male short and broad, terminating in a curved hook. Posterior antennee and mouth organs as in S. paguviz. Both branches of Ist to 4th pairs of natatory legs 3-jointed, most of the joints having small bundles of fine hairs on the surface or at the sides. Fifth pair as in S. pagurv. Abdomen about the same length as the cephalothorax, composed of jomts of which the genital segment is the larger one. Furcal rami twice as long as the breadth, tapering to the apex, and each having a stout spine on inner margin. Several specimens were found in the general washings from Ceylon Invertebrates. The relative lengths of the joints are as follows : Sunaristes longipes, u. sp.—Plate III., figs. 9 to 11. Length, female 1°5 millims. ; male unknown. Similar in build to the last species but more robust. Anterior antennz 6-joimted and similar to S. inopinata, except in proportional lengths of joints, which are as I oh 445 ee LBs Mo, Bs Desk IS Abdomen short and robust, about equal in length to the first 3 thoracic segments. First 2 joints are coalescent, the 4th and especially the 5th very small. Furcal rami long and tapering, the length 3 times that of the breadth; each has a spine on both sides. Mouth organs as in Longipedia, Canuelia and Sunaristes. Other organs as in last species, with the exception of 4th pair of natatory legs, which (fig. 10) are very narrow, the inner branch being nearly double the length of the outer one. The length of the furcal rami and the elongated 4th pair of natatory legs serve to distinguish this species from others of the genus. One specimen only, a female, was found in the general washings from Ceylon Invertebrates. tollows : Sunaristes curticaudata, n. sp.—Plate III., figs. 12 to 17. Length, female, 1°6 millims. Male unknown. First segment of cephalothorax equal in length to that of the four following segments combined, and much broader. Abdomen 4-jointed, about three-fourths of the length of the cephalothorax. Anterior antenne 4-jointed, all adorned with plumose setze, the second joint having also two spines. The proportionate lengths Il, 2 By 4b 12, 1G, & Mouth organs as in Longipedia, Canuella and Sunaristes. are as follows: COPEPODA. 257 Other organs similar to those of S. paguri, with the exception of the inner branch of the 4th natatory legs, which im this species is 2-jointed (fig. 16). Caudal segments short, their length not much exceeding the width; the anterior imner corner of each is marked off by a dividing line. One specimen only was found in the general washings of Ceylon Invertebrates. The form of the fureal rami is sufficiently diagnostic to distinguish this from other species of the genus. The fact that this species has the inner branch of the fourth pair of legs only 2-joimted may, sometime, necessitate its removal to a new genus. Longipedia coronata, CLAUs. Occurred at 2 stations in the Mediterranean and once in the Suez Canal. Usually a littoral species. Found also in washings from Sponges, Gulf of Manaar. Longipedia minor, 'T. Scott. A few specimens of this form were obtained in the tow-net off Marichchukaddy. Canuella perplexa, T. and A. Scort. One specimen was taken between Port Said and Suez. Xetinosoma atlanticum (Brapy and Ropertson). The most abundant species throughout the collection. Occurred at 66 stations, from the Mediterranean throughout the Red Sea and Indian Ocean and all around Ceylon. Ectinosoma roseum, DANA. Hardly less common than #. atlanticwm. Fifty-nine stations, similarly distributed. Ectinosoma normani, T. and A. Scort. Ectinosoma propinquum, T. and A. Scorv. Both species found in washings from- young pearl oysters and in the general washings from Ceylon Invertebrates. Setella gracilis, DANA. Occurred at 44 stations fairly continuously, from the Mediterranean to Ceylon. Miracia efferata, DANA. Was obtained in the Indian Ocean, twice off Minikoi, and between the Maldives and the Gulf of Manaar. Miracia minor, T. Scort. Was taken off Gibraltar, and was also found at 2 stations in the northern Indian Ocean, Scorr’s specimens were taken in the Gulf of Guinea, 2 L 258 CEYLON PEARL OYSTER -REPORT. Euterpina acutifrons (DANA). Well distributed throughout the traverse, occurring at 48 stations, from the Mediterranean to Ceylon. Tachidius littoralis, Poppe. One specimen was taken in the Gulf of Suez. Clytemnestra scutellata, Dana. Occurred at 10 Indian Ocean stations, and 3 round Ceylon, viz., off Pantura to the south of Colombo, at Cheval Paar and west of Periya Paar, Gulf of Manaar. Clytemnestra rostrata (BRApy). Found at 8 stations, from the Mediterranean, Gulf of Suez, Red Sea, and the Indian Ocean, and once at Ceylon, near the Muttuvaratu Paar. Tegastes spherica (CLAUS). One specimen of this littoral species was taken between Port Said and Suez. Tegastes nigrans (‘T. and A. Scort). A number of specimens were found in washings from Muttuvaratu pearl oysters. Tegastes imthurni, n. sp.—Plate IV., figs. 1 to 9. Length, female 0°6 millim. to 0°45 millim. ; male unknown. Cephalothorax composed of 6 segments; the first broadly falciform, and extending ventrally to double the width of the other segments. Abdomen 4-jointed, the first extending ventrally into a long projection, truncated at end. A large rounded hook from the centre of the Ist segment projects over the posterior ends of the other segments. : ae j : I Ys as 2h, Anterior antennze 6-jointed, the relative lengths being: 5~ a were 25. 18. 9. 4. 4. 4. Posterior antennze and mouth organs, with the exception of the 2nd maxillipeds, asin 7. spherica. In this species the inner concave edge of the chelate hand, instead of being pectinated, has a small funnel-shaped expansion, the upper cireular edge being clothed with fine hairs. The inner projecting corner of the hand has, on the upper edge, about 10 short spines arranged in a pectinate manner. The Ist pair of natatory legs are similar to 7. spherica. The 2nd, 3rd, and 4th pais differ considerably from that species, however, and also from the generic description in Brapy’s Monograph of British Copepoda. In the 2nd and 3rd pairs of T. imthurni, and also in 7. donnani, and in T. twynami, the mner branches are composed of 3 joints, while the outer branches have only 2 jomts. The 4th pair has the outer branch 3-jointed, and has only 2 joints in the inner branch. The basal joint of the inner branch of this pair is a wide foliaceous expansion with thickened — \ > ee |, ee eee COPEPODA. 259 edges. The 5th pair in this and the following 3 species are also different from the type of the genus, and instead of being 2-jointed, are composed of 1 joint only, which, however, is obviously built up of 2 coalesced joints. Fig. 2 represents a smaller form, not differing in details of structure, except in the absence of hook from abdomen. Several specimens were found in the washings from the Muttuvaratu pearl oysters. At Professor HerpMAN’s suggestion we dedicate this new species to Mr. E. F. im Taurn, the Lieutenant-Governor of Ceylon at the time of the investigations. Tegastes donnani, vu. sp.—Plate IV., figs. 10 to 12. Length, female, 0°37 millim. ; male unknown. In appearance and structure this species very nearly resembles 7. imthurni, the 7-jointed anterior antennz and the 5th natatory legs being the only important points of difterence. 2 ue Wy Bh 24 Os LBS Proportionate lengths of antennary joints; ——————_________ 265 20. 25722) AD Shi7. Four specimens, all females, were found im the Muttuvaratu pearl oyster washings. We name this species after Captain J. Donnan, C.M.G.. formerly Inspector of the Ceylon Pearl Fisheries. Tegastes twynami, n. sp.—Plate IV., figs. 13 to 16. Length, female 0°54 millim. ; male unknown. This species also resembles 7. cinthwini in detail, with the exception of the anterior antenne, the hand of the 2nd maxillipeds, and the 5th natatory legs. The anterior antennee are cnly 6-jointed, the proportionate lengths of the joints being as le "2s O28 Os 0. LSS = Ta Tene The inner concave edge of the hand in 2nd maxilliped is strongly pectinated and has a round funnel-shaped protuberance with ciliated edge similar to that of T. imthurn ; the terminal falcate claw is very stout. Fifth pair of natatory legs like those of 7. donnan, but larger. Two specimens, both females, were found in the washings from the Muttuvaratu pearl oysters. The cuticle in the foregoing species is covered with minute circular dots, these are also found on the basal joint of the fourth pair of legs, on the fifth pair and in a lesser degree on the chela of the posterior maxillipeds. We name this species in honour of Sir Wititiam Twynam, who has long been connected with the Ceylon Pearl Fisheries. Tegastes chalmersi, nu. sp.—Plate IV., figs. 17 to 22. Length, female, 0°3 millim. ; male unknown. A much smaller form than any of the three preceding. Cephalothorax 5-jointed ; length and breadth of Ist joint about equal. 20 2 : 2 260 CEYLON PEARL OYSTER REPORT. Abdomen 3-jointed, the Ist joint bemg produced as in the other species of the genus, but different from them in having 4 large denticulations on its outer surface. Anterior antenne 7-jointed, the proportionate lengths of the joints being as Il ay Be GE Bs Gh 14.10. 6.4. 4. 4. 5, . The 2nd maxillipeds differ considerably from those of any of the preceding species. The middle joint is long and narrow, arcuate on one side and flat on the other, with short setze on one-half of the flat side. The terminal spine is shaped like a scythe and about # the length of the middle joint. Natatory legs as in 7. imthurni, excepting 4th and 5th pairs. In the 4th pair the outer and inner branches are both 3-jointed, and the basal joint of the inner branch is not foliaceous. The 5th legs are less angular than those of the other species, the surface being covered with rows of follows: convolute markings. Two specimens, both females, were found in the Muttuvaratu pearl oyster washings. The anterior antennee, the 2nd maxillipeds, and the 4th natatory legs readily distinguish this species from the others of the genus. This species is named after Dr. A. J. CHALMERS, formerly a Liverpool Student of Science, now Registrar and Professor in the Medical College, Colombo. Stenhelia brevicornis, n. sp.—Plate V., figs. 1 to 9. Length, female, 0°9 millim. ; male unknown. Cephalothorax narrow, 5-jointed. Anterior antenne short, 8-jointed, the relative Is Bo 8 44 BO 7B 185 12, 10, Bid, Ga. are shorter than the breadth and bear numerous setze. The 4th joint is produced on lengths of the joints being as follows : Most of the joints upper side, terminating in a long filament. Posterior antennze, mouth organs, and Ist to 4th paws of natatory legs as in S. 7ma. The basal joint of 5th pair is large and triangular, bearmg 6 marginal and apical setee, two of them plumose ; second joint long and narrow, tapering towards apex and bearing six setie, the apical one much longer than the marginal ones. Abdomen 5-jointed ; the posterior margin of the Ist joint has a dorsal hook, the margins of the other joints being fringed with fine hairs, Fureal rami about 3 times as long as broad. Two specimens only, both females, were found in the Muttuvaratu pearl oyster washings. The short, broad-jointed anterior antennze, the outer jot of the oth natatory legs, and the long fureal rami are the chief distinguishing features ot this species, Stenhelia gracilicaudata, n. sp.—Plate V., figs. 10 to 15. Length, female, 0°67 millim. ; male unknown. Cephalothorax 5-jointed, very robust. Anterior antennze 8-jointed, the: propor- COPEPODA. 261 Ons Rae @ tional lengths of the joints being as follows: oh ae Bests Sel ile They are 4h SO, UO, Wil, 46 a & iO: well clothed with setee on the. upper side. The 4th joint is produced and terminates in a long narrow filament. Posterior antenne and mouth organs as in S. brevicoriis. Natatory legs in general similar to those of S. brevicorms, but the Ist pair differs therefrom in the respective lengths of its joints; the 5th pair is less triangular, the second joint being ovate. Abdomen 5-jointed, about the same length as the cephalothorax, but only half the width, and non-setiferous on posterior edges, Furcal rami about 4 times as long as broad. One specimen only, a female, was found in the Muttuvaratu pearl oyster washings. The chief distinguishing features are the anterior antennz, the Ist and 5th natatory legs, and the long narrow fureal rami. Stenhelia longicornis, n. sp.—Plate V., figs. 16 to 22. Length, female, 0°8 millim, ; male, 0°6 millim. Cephalothorax similar to that of S. brevicornis. Anterior antennee 8-jointed, long | lL Bh LORS 15, 24) 19, i. BL Bae terminates in a long narrow filament; the sete of the various joimts as in aud narrow, the proportional lengths being : The 4th joint S. gracilicaudata. Posterior antennee and mouth organs and 2nd to 4th pairs of natatory legs as in S. brevicornis. The 1st pair of legs agrees in form with S. gracilicaudata, as also does the 5th pair in the female, with the exception of the spines of the inner joimt, which in this species are shorter, more numerous, and mostly plumose. The outer joint has a pellucid circle near the outer edge. Fig. 21 shows the inner branch of the 2nd pair in the male, and fig. 22 the 5th leg of the male, which is much smaller than that of the female. Abdomen short and broad, the 4th joint having a short tooth on lower edge. The furcal rami are very small, about half as long as broad. A few specimens of each sex were found in the Muttuvaratu pearl oyster washings. The long narrow anterior antenne, the 5th natatory legs, and the small fureal rami are the distinguishing characters of this species. Stenhelia perplexa, n. sp.—Plate VL., figs. 1 to 7. \ Length, female, 0°6 millim. ; male unknown. Cephalothorax much resembles S. brevicornis. Anterior antenne 8-jomted, the le We 8, 4 Wale Mo So ; iy 7, Oy Se: Posterior antennz and mouth organs, with the exception of 2nd maxillipeds (fig. 3), as in S. brevicornis. Natatory legs all more or less similar to those of S. longicornis. proportional lengths of joints being as follows : 262 CEYLON PEARL OYSTER REPORT. Abdomen broad, the joints mostly quadrate, posterior margins devoid of sete. Furcal rami short and broad, produced downwards on inner edges; terminal setee as in S. longicornis. Several females were found in the washings from Muttuvaratu pearl oysters. This species in many of its characters resembles other members of the genus, without agreeing with any one in all respects. The jointing of the anterior antennz and the long 2nd maxillipeds are its chief distinguishing features. Stenhelia dentipes, ». sp.—Plate VL, figs. 8 to 14. Length, female, 0°56 millim. ; male unknown. Cephalothorax somewhat angular anteriorly, with long narrow pointed rostrum. The autenne in the only specimen found were missing, with the exception of the four basal joints on one side. Mouth organs as in S. brevicoriis, with the exception of 2nd maxillipeds, the middle joint of which is broadly ovate, and the claw curved and slender. The inner branch of the Ist pair of natatory legs is double the length of the outer branch ; 2nd to 4th pairs as in S. brevicornis. Inner branch of 5th pair elongated, terminating in a short dagger-like spine ; second joint long and gradually narrowing, ending in a small elegant foot-shaped protuberauce having 2 apical and 5 lateral setee. In this respect it somewhat resembles S. blanchardi, T. and A. Scorr. Abdomen similar to S. perpleaa; fureal rami twice as long as the width. Found with the other members of the genus here described in the Muttuvaratu pearl-oyster washings. It can be readily distinguished by its 5th pair of natatory legs. Stenhelia knoxi, n. sp. —Plate X., figs. 15 to 18. Length, female 0°67 millim. ; male unknown. Cephalothorax and abdomen each with 5 segments. Anterior antennz very stout Ne Pee eds = Oe 12. Os Bo Tt Go iF Both branches of Ist to 4th pairs of natatory legs 5-jointed ; outer branch of Ist pair has long, strong, lateral and terminal spines ; 2nd joint of 5th pair ovate. 6-jointed, the proportional lengths being as follows : Three specimens, all females, were found in the Muttuvaratu pearl oyster washings. We name this species after Ropert Knox, who escaped from the King of Kandy to the coast, at the pearl banks, in 1679. Although the anterior antennz are only 6-jointed instead of 8, in all other respects the characters agree with those of Stenhelia, so we have thought it best to melude this species in that genus. Stenhelia minuta, n. sp.—Plate VI. figs. 21 to 24. Length, female, 0°5 millim. ; male unknown. This minute species bears a close resemblance to S. brevicornis, both in general A a nt Se el —— COPEPODA. 263 form and in its mouth organs, posterior antennze, and 2nd, 3rd, and 4th pairs of natatory legs. Anterior antennze 8-jointed, the proportional length of the joints il, eo By 445 Ds Os Vo 8 10. 12. 6. 10. 2. 35. 4. 6. In its Ist pair of natatory legs it resembles S. longicorms, the 5th pair being being as follows : similar to those of S. gracilicaudata. One specimen only, a female, was found in the Muttuvaratu pearl oyster washings. Its minute size, the jointing of the anterior antenne, and the Ist and 5th natatory legs constituted its chief features. Parastenhelia, n. gen. Anterior antennze 9-jointed. Inner branch of posterior antennze 3-jointed. Mandible palp with 2 branches each 1-jointed. Second maxilliped like a grasping hand. First pair of natatory legs has outer branch 3-jointed, inner branch 2-jointed. Inner branches of 2nd, 3rd, and 4th pairs all 3-jointed. Fifth pair foliaceous and 2-jointed. Abdomen in both sexes 5-jointed. The characters which distinguish this genus from Stenlelia are the 9-jointed antennze and the 2-jointed inner branch in Ist pair of natatory legs. Parastenhelia hornelli, n. sp.—-Plate VII., figs. 1 to 10. Length, female 1 millim.; male 0°77 millim. In general appearance, and in the jointing of cephalothorax and abdomen, this species much resembles the members of the genus Sfenhelia. Anterior antennze of female 9-joimted, the proportional lengths of the joints being Ie Be By 4 Ga Bs Os i, YO, 1h, 1D) eae ee The upper surface is plentifully clothed with long sets. Inner branch of posterior as follows: antennee 3-jointed, the 2 apical joints bearing several plumose spines. Basal joint of mandible large, with lateral warty protuberance, and 3 rounded teeth at apex. Palp is of pyriform shape, having 3 plumose spines at apex, and laterally has 2 branches, each composed of 1 joint bearing several setze. Second maxilliped is a grasping hand with ovate middle joint, terminating in a stout claw. Inner branch of Ist pair of natatory legs 2-jointed, the 1st joint being 14 times the length of the entire 3-jointed outer branch ; terminal joint very small. Inner branches of 2nd, 3rd, and 4th pais all 3-jointed in both sexes. Fifth pair foliaceous ; basal joint triangular and bearing plumose spines. Second joint in female very long, wide at base and tapering towards apex, the edges having fine hairs, and the apex 6 spines, mostly plumose. Outer branch of male 5th pair half the size of the female and distinctly divided into 3 joints bearing spines, mostly plumose. Several males and females were found in the washings from young pearl oysters, also in the general washings of dredged material, in deep water off Point de Galle, 264 CEYLON PEARL OYSTER REPORT. and in the Muttuvaratu pearl oyster washings. We have pleasure in dedicating this new form to our friend Mr. James Horney, who worked with Professor Herpman in Ceylon. The 9-jointed anterior antennze and the 2-jomted inner branch of 1st pair natatory legs clearly separate this species from the genus Stenhelia, with which it in most other points agrees. These characters, together with the 3-joited inner branch of 2nd pair of natatory legs in the male, as well as the remarkable 5th pair in both sexes, served to distinguish this species from any other genus known to us. Parastenhelia similis, n. sp.—Plate X., figs. 8 to 14. Length, female 1 millim,; male unknown. Has a general resemblance to P. hornelli, but differs therefrom in the Jength of joints of anterior antennze, in the 2nd maxillipeds, and in the 2nd branch of 5th natatory legs. Anterior antennze 9-jointed, the proportional lengths of the Sit i Ly 2 ab 2s Bb Os 7a ty Oe joints being as follows: - — — : AO, 8), tes Wo Did 45° 25) Gy Hand of 2nd maxillipeds gracefully curved; the apical claw long and stout. Inner joint of 5th pair of natatory legs long and wide; laterally lined with fine hairs; the terminal spines plumose. Furcal rami about twice as broad as long. Two specimens, both females, were found in the Muttuvaratu pearl oyster washings. Ameira minor, n. sp.—Plate V., figs. 23 to 29. Length, female 0°46 millim. ; male unknown. Cephalothorax narrow, 5-jointed. Anterior antennze 8-jomted, the proportional oe re lengths of the joints being as follows : mes Ee ee Ze 4 a 5, PAO MO tek Gs eh The 4th joint terminates with a long narrow filament. Posterior antennz similar to those of A. longipes. Mouth organs as in A. longiremis. Natatory legs, Ist to 4th pairs, somewhat similar to those of A. Jongipes. The 5th pair much resemble those of A. tenwicorirs. Abdomen 5-jointed, the posterior edges of all the joints lined with minute hairs. Fureal rami subquadrate, each terminating in 2 thick and 3 thin sete. A considerable number of females only were found in the Muttuvaratu pearl-oyster washings. This is a very small species bearing a strong resemblance to the genus Stenhelia, but distinctly differing from members of that genus in having the inner branch of the posterior antennze 1-jointed. Ameira tenuipes, n. sp.—Plate VI., figs. 15 to 20. Length, female 0°53 millim. ; male unknown. Cephalothorax 5-jointed. Rostrum short and wedge-shaped. Anterior antennze profusely setose, 8-jointed, the proportional lengths of the jomts being as follows : COPEPODA. 2695 i, QB BA eG 7 Ge POsp2i. P28. 6.. 6. 3, 5. branch of posterior antennze is 2-jointed, the 2nd joint being very small. The 4th joint terminates with a long filament. The inner Mouth organs and 2nd, 3rd, and 4th pairs of natatory legs asin A. minor. First joint of inner branch of Ist pair of legs as long as entire 3-jointed outer branch; 3rd inner joint long and narrow. Basal joint of 5th pair of legs triangular, bearing 2 short plumose setze and 3 plain ones. Outer joint long and narrow, 4 times as long as broad; fringed on both sides with fine hairs, and having 4 terminal sete and 1 lateral. One specimen only, a female, was found in the Muttuvaratu pearl oyster washings. Although the inner branch of the posterior antennze is 2-jointed, we have thought it best to include this species in the genus Ameira, with which it agrees in all other particulars. The Ist and 5th natatory legs readily distinguish it from other species. Ceylonia, n. gen. Cephalothorax and abdomen each 5-jointed. Anterior antennze 7-joimnted. Inner branch of posterior antennee 1-jointed. Mandible palp with one small branch. Second maxilliped non-prehensile. Inner branches of Ist to 4th pairs of natatory legs all 2-jointed ; outer branches 3-jointed ; 5th pair foliaceous. The genus Ceylonia is nearly related to Mesochra, and might have been incor- porated therewith but for the structural difference in the Ist pair of natatory legs and in the maxillipeds. Ceylonia aculeata, n. sp.—Plate VII, figs. 11 to 23. Length, female 1:2 millim; male 1 millim. Body robust throughout ; cephalothorax and abdomen each 5-jointed, the first two abdominal joints imperfectly divided. Rostrum short and blunt. Anterior antennee short and stout, thickly setiferous, 7-jointed, a long thick filament protruding from the apex of 4th joint. The proportional lengths of the joints are as A ar Se OF GLsiz GMa LE ONSN Gms Outer branch of posterior antennee 2-jointed, the outer edge and apex of 2nd joint lined with 6 stout spines ; inner branch composed of one joint with 2 apical spines. Biting part of mandible consists of 3 large teeth; palp with small branch, spinous at apex. First maxilliped has terminal claw and two 1-jointed branches with apical plumose setee. Second maxilliped wedge-shaped, non-prehensile, but with small follows : curved rudimentary claw. Inner branches of Ist to 4th natatory legs 2-jointed; outer branches 3-jointed. Inner branches of 1st pair only 3 the length of outer branch, both bearing strong spines ; a remarkable rod-like projection with hirsute termination extends from the centre of ist joint of inner branch. The middle joint of outer branch of male 2M 266 ’ CEYLON PEARL OYSTER REPORT. 3rd pair of legs bears a long stout aculeate spine. Fifth pair of legs foliaceous ; outer joint in female roundly ovate, both clothed with long spinous sete. In the male 5th pair the joints are coalescent and terminate in dagger-shaped spines and plumose sete. Furcal rami about 1$ times as long as broad, each bearing a long thick terminal spine and short setee. Several females and 2 males were obtained from young pearl oyster HRs, and from deep water off Point de Galle. The anterior and posterior antennz, the mouth organs and the Ist and 5th pairs of natatory legs are clear distinguishing characters of this species. Laophonte serrata, CLAUS. Laophonte inornata, A. Scorr. Both of the above were taken at Cheval Paar, and were also found in general washings of Invertebrates from the pearl oyster beds. Laophonte hirsuta, n. sp.—Plate VIII., figs. 1 to 8 Length, female 0°5 millim. ; male unknown. Lateral edges of cephalothorax and abdomen fringed with minute hairs, giving the animal a hirsute appearance. First cephalic segment quadrately shield-shaped, produced postero-laterally, and equalling in size the rest of the cephalothorax and abdomen. Anterior antennze 6-jointed, the proportional lengths of the joints being as Wo Ao & 45 D> ©. oan ee ea) the protuberance of the 4th joint leading to a long narrow filament. Posterior antennee and mouth organs, with the exception of mandible, as in L. horrida, Mandible elongated and narrow, the palp being long and slender. Inner follows : The upper side is clothed throughout with short sete, branch of 1st pair natatory legs remarkably robust, terminating in a very small joint and a short stout curved claw. Outer branch 2-jointed, the 2 joints not half the length of the 1st inner joint. The outer branch in 2nd, 3rd and 4th pairs is 3-jointed, the inner 2-jointed. The 5th pair have small basal joints and a long narrow second joint armed with plumose sete. Fureal rami small, subquadrate. Eleven specimens, all females, were obtained from the Muttuvaratu pearl oyster washings and the general washings of dredged Invertebrates. The Ist and 5th natatory legs are sufficiently diagnostic of this species. Laophontella, n. gen. Body somewhat pyriform, the cephalic segment nearly half the animal’s entire length. Anterior antennze 5-jointed. Posterior antennze and mouth organs appear to be as in Laophontodes. The 1st, 2nd, and 3rd pairs of natatory legs have both inner COPEPODA. 267 and outer branches 2-jointed, 4th pair with outer branch 3-jomted, and inner branch with 1 joint only; 5th pair 2-jointed, foliaceous. Laophontella differs from both Laophonte and Pseudolaophonte in the absence of claws in the Ist natatory leg; from Laophontodes in the inner branch of 4th pair being only 1-jointed. With only one specimen, however (a female), to judge from, the generic characters may in the future require some revision. Laophontella typica, n. sp.—Plate VIII., figs. 9 to 16. Length, female, 0°5 millim. ; male unknown. Cephalic segment long and tumid; produced posteriorly into long acute spines. Lateral edges of abdomen more or less notched. Anterior antennze nearly half as broad as long, 5-jointed, profusely setiferous, the proportional lengths of the joints Wo 5 By eS By 1G & A ye joint another, of larger size. being as follows: The Ist joint has two claw-like spines, and the 3rd Mouth organs similar to those of Laophontodes. Branches of Ist pair of natatory legs of equal length; outer branch 3-jointed, as are the outer branches of 2nd, 3rd, and 4th pairs; inner branch 2-jointed, the Ist joint being double the length of the 2nd, both branches terminating in long sete. Inner branch of 2nd and 3rd legs 2-joited, and of the 4th 1-jointed, all armed with strong spines. Basal joint of 5th pair small and spinous; outer joint small, bearing 7 spines. One specimen only, a female, was found in the Muttuvaratu pearl oyster washings. The stout rugged anterior antennze, the notched abdominal segments, and the inner branches of the swimming feet clearly distinguish this species from other genera. Cletodes linearis (CLAUS). Taken in the Suez Canal, and also in various washings of Invertebrates from the Gulf of Manaar. Tetragoniceps dubia, n. sp.—Plate VIII, figs. 17 to 22. Length, female, 0°9 millim. ; male unknown. — Cephalothorax 5-jointed, the cephalic segment equalling in length the following three combined, and considerably stouter. Rostrum short and blunt. Anterior antennee 8-jointed, the Ist joint non-setose, but projecting posteriorly mto a beak- shaped protuberance. The other joints very setose, the 4th bearing a long narrow Up Peres Ge Os tek ST, 9G WAN auiaiis! Posterior antenne and mouth organs generally like those of 7. malleolata. Inner branches of 1st to 4th pairs of natatory legs 2-jointed, the outer branches 3-jointed. Fifth legs 1-jointed, with partial segmentation, and having 10 sete. A pyramidal spine projects from the surface. Furcal rami-about twice as long as broad. filament. ‘The proportional lengths of the joints are 2M 2 268 CEYLON PEARL OYSTER REPORT. One specimen only, and that possibly an immature one, was found in the Muttuvaratu pearl oyster washings. It is nearly related to T. malleolata, with which we were at first disposed to place it. The 5th feet are, however, very different from, and the furea much shorter than in that species, so that it seems necessary to separate the present form. Tetragoniceps minor, n. sp.—Plate VIII., figs. 23 to 28. Length, female, 0°5 millim. ; male unknown. Closely related to T. bradyi; differing, however, from that species in the jointing of the anterior antennee, and in the long narrow furcal rami. Anterior antennz 5 on ep dy i ek ADs Aa Silane Wenbe beak-like hook projects from the 2nd joint, by which it differs from 7. consimilis. 8-jointed, the proportional lengths being as follows : A long The posterior antennze, the mouth organs, and the 5 pairs of natatory legs are much the same as those of 7. brady. One specimen only was found in Muttuvaratu pearl oyster washings. The beaked 2nd joint of the anterior antennz sufticiently distinguishes it from others of the genus, Dactylophusia tisboides (CLAUS). This littoral species was taken between Port Said and Suez. Dactylophusia latipes (T. Scort). Taken sparingly on the Ceylon pearl banks. Only previous record is Gulf of Guinea. Dactylophusia dentata, n. sp.—Plate IX., figs. 1 to 10, Length, female 1:2 millim. ; male 0°83 millim. Cephalothorax robust; cephalic segment about as long as the rest of the thoracic segments combined. Third and fourth segments have remarkably sharp dorsal teeth ; abdomen narrow, little more than one-third the length of the cephalothorax ; lateral margins of genital segment produced into a large blunt tooth. Anterior antennze 8-jointed, the proportional lengths being as follows : 3 _ > ; A ; = 5 The prolonged apex of joint 4 bears a long broad filament. Inner branch of posterior antennze 2-jomted. Mandible palp 2-branched, the primary branch having long terminal sete. Second maxilliped has an angular hand and terminal claw of about the same length. Both branches of Ist pair of natatory legs 3-jomted; the basal inner joint half as long again as the entire outer branch; the other joints very small. In the male the 2nd joint of imner branch of 2nd pair is produced into a long pointed dagger-like spine, broad at base. Fitth pair of female 2-jointed, foliaceous, oo COPEPODA. 269 the inner joint ovate; those of the male similar but smaller. Furcal rami sub- quadrate, about twice as long as broad, a thick chitinous band lining the inner edges. Ten males and 5 females were found in the Muttuvaratu pearl oyster washings. The dentated thoracic and 1st abdominal segments, the 2nd maxillipeds, the male 2nd natatory legs, and the furcal rami clearly distinguish this species. Dactylophusia havelocki, n. sp.—Plate IX., figs. 11 to 18. Length, female 1 millim. ; male unknown. Anterior antennee short, 8-jointed, the joints short, length and breadth of each nearly equal. Fourth joint bears a long narrow filament, and the proportional 1, Bs Bo 2b & Gy Wo Be CER aa eae Mandible palp 2-branched, secondary branch small, distinctly 2-jointed. Hand of 2nd maxilliped rounded on one side, flat on the other; claw slender. Natatory legs similar to D. dentata; the inner branch of the 5th pair however is nearly quadrate instead of ovate. Furcal rami nearly twice as broad as long; basal portion of apical lengths of the joints are : spines thick and jointed. A few specimens, all females, were found in the Muttuvaratu pearl oyster washings. The short anterior antennze and furea, coupled with the shape of the mandible palp, and the inner joint of the 5th natatory legs, characterize this species. Dactylophusia hirsuta, n. sp.—Plate IX., figs. 19 to 24. Length, female 1:2 millim. ; male unknown. All the segments of the abdomen covered with rows of fine short hairs. Anterior antennze 9-jointed, the 4th joint bearing a long filament. I 2 By Zh Be Ga He Be O; Eo, Oe. &, AS, ©, Basal jot of 2nd maxilliped has a row of small hairs near apex, and three terminal The proportional lengths of the joints are as follows : plumose setz ; hand small; the claw 2-jointed, long and narrow. Inner branch of Ist pair of natatory legs as in D. dentata, but with shorter terminal spines; 5th pair not unlike those of D. dentata, but the length and armature of the setz are distinctly different, and each joint has a pellucid patch on its surface. Fureal rami very short and hirsute. Three specimens, all females, were found in the Muttuvaratu pearl oyster washings. The 9-joimted anterior antennz, the hirsute abdomen, 2nd maxillipeds and furea, and the 5th pair of natatory legs serve to distinguish this species. Dactylophusia ceylonica, n. sp.—Plate IX., figs. 25 to 32. Length, female 1°3 millim.; male 0:96. Posterior dorsal edges of thoracic and abdominal segments have each a row of’ fine 270 CEYLON PEARL OYSTER REPORT. hairs. Anterior antennee 8-jointed, the proportional lengths of the jomts being as ile Ahi Bo 4 Ds Os Wo foi na NT te Bhat 52" First pair of natatory legs of female same as in D. hirsuta ; the inner branch in male The 4th joint bears a long thin filament. has a remarkably long stout spine equalling in length the Ist joint, projecting from the 2nd basal joint. The 2-joimted inner branch of 2nd pair in male has 3 thick more or less curved spines at apex of 2nd jomt. Outer joit of 5th pair in female about equal in size to the Ist joint. In the male both joints are exceedingly small. Eighteen females and 13 males were found in the Muttuvaratu pearl oyster washings. The chief distinguishing characters of this species are the inner joints of Ist and 2nd male natatory legs, and the 5th pair in the female. Dactylophusia hamiltoni, n. sp.—Plate X., figs. 1 to 7. Length, female 1°1 millim. ; male unknown. ~ Cephalothorax and abdomen each with 5 segmeuts. Aatenion antennze cla the proportional lengths of the joimts bemg as ee a 4B Os OW, Miho eb 12, 12, 10. 11.8.6, 4.7. A long filament springs from the prolongation of the 4th joint. Outer branch of follows : posterior antennze 3-jointed, a 2-jomted inner branch springing from the basal joint. Second maxillipeds large ; the apical claw strong, blunt at end. Inner joint of 5th paw of natatory legs subquadrate, about twice as long as broad. Abdomen long and slender ; furcal rami quadrate, about twice as long as broad. One specimen only, a female, was found in the Muttuvaratu pearl oyster washings. The form of the 2nd maxillipeds, and 5th pair of natatory legs, and the abdomen, are characteristic of this species, which we name after Colonel HAMILTON, a former inspector of the pearl banks. Dactylophusia robusta, n. sp.—Plate X., figs. 19 to 24. Length, female 0°64 millim, ; male unknown. A small but moderately robust species with a very tumid cephalothoracic segment. Anterior antenne 8-jointed. Joints long and narrow, with the exception of the 2. 3. 4.5. 6. cb 14, 24, 12. 20. 4. 10. Posterior antennz, mandible, and maxilla similar to those of D. inne 2nd maxillipeds have the palm straight and the lower side rounded. Outer branches of the Ist natatory legs much shorter than the inner branches. The middle joint of the outer branches longer than either the basal or apical joints; 2nd, 3rd, and 4th legs resemble those of D. t’sbocdes. The 5th pair have a large primary joint and a moderately long and narrow secondary joint. The primary joint is furnished with Ww | 60 5th, which is very small; the proportional lengths are : 5 setae, and the secondary with 6 sete. Abdomen 4-joimted, about half as long as COPEPODA, : 271 the combined lengths of the cephalic and thoracic portions. Furcal rami small, longer than broad. A few specimens were found in the washings from the Muttuvaratu pearl oysters. D. robusta differs from other species in the structure of the anterior antenns, and the 1st and 5th natatory legs. Dactylophusia laticaudata, n. sp.—Plate XI., figs. 1 to 8. Length, female 0°6 millim. ; male unknown. A small flat species of a yellow colour, resembling in general appearance D. flava. When only recently preserved, the Ist, 2nd, and 3rd thoracic segments present a band of deep brown madder colour; this band eventually disappears in spivit- specimens, and only the general colour remains. Anterior antennze 6-jointed, short 1. 2. 3. 4. 5. 6. iG, 12, Oy Coes Secondary branch of posterior antennze 2-jointed ; basal joint very short ; 2nd joint and robust ; the proportional lengths are : long. Mandible as in D. tusboides; palp with 2 nearly equal branches. The lower branch is furnished with 2 strong spines situated in the middle of the external margin. Maxilla and Ist maxilliped resembling those of D. tisboides. Second maxilliped long and narrow, both surfaces slightly rounded; terminal claw very strong. Outer branch of Ist natatory legs 3-jointed, very short ; inner branch has a long and very wide Ist joint and one small terminal joint; 2nd, 3rd, and 4th legs resembling in general those of the genus; the terminal spines have ring-like markings. The 5th legs have the primary joint large and foliaceous, much longer than broad, with 5 short, stout terminal spines; secondary joint small with 2 strong spines on the outer margin, 2 terminal ringed spines and 1 small spine on the inner distal margin, Abdomen 4-jointed, very wide. Furcal rami small and tumid. Several specimens of this curious species were found in the Muttuvaratu pearl oyster washings. Dactylophusia emula, n. sp.—Plate XI., figs. 9 to 12. Length, female 0-4 millim, ; male unknown. In general appearance very like D. laticaudata, but smaller and less robust. The colouring is the same as in that species. Anterior antennz narrow, 7-jointed. The proportional lengths of the joints are as follows : aoa tine My eae Sze Oa "4:93. 6: Posterior antennz, mandible and palp, maxilla and maxilliped as in D. laticaudata. The Ist to 4th natatory legs resemble those of D. laticaudata, except that the basal joint of the inner branch of the Ist is less tumid. The 5th legs in this species also have the primary joint large and foliaceous, but proportionally broader than long, and 272 CEYLON PEARL OYSTER REPORT. 74, the terminal spines are shorter and less tumid; secondary joint small. Marginal spines, with the exception of the inner sub-terminal one which is very strong, short and slender. Abdomen less tumid than in D. laticaudata. ie a3 Several specimens, all females, from the same locality as the foregoing species, from which it is distinguished by the’ structure and proportional lengths of the joints of the anterior antennz, and by the Ist and 5th legs. The two foregoing species differ in the structure of their appendages, especially in the 1st legs, which have the inner branch only 2-jointed, from the general type of Dactylophusia, and may some time require a separate genus. Dactylophusia platysoma, n. sp.—Plate XI., figs. 13 to 18. Length, female 0°62 millim, ; male unknown. In general appearance more like a Porcellidiwm than a Dactylophusia, and it is only when the appendages are examined that it becomes clear that it is not a Porcellidium ; neither can it be said to be a typical Dactylophusia, though pro- visionally referred to that genus. Anterior antenna moderately long and slender, 9-jointed ; the proportional lengths are : a: ee ri : f . : Posterior antennze, mandible and palp, maxilla and Ist maxillipeds nearly as in D. tisboides ; 2nd maxillipeds elongate, with a strong terminal claw. First natatory legs resembling those of D. tisboides ; 2nd, 3rd and 4th though generally like those of Dactylophusia, are more slender than the corresponding legs of any member of the genus known to us. The 5th feet have the primary joint large and foliaceous. The extremity of the joint is fringed with fine hairs, amongst which are 3 prominent setee ; secondary joint not distinctly separated from the primary one, with rounded margins and furnished with 6 apical sete. Abdomen very flat, 4-jomted, furcal rami short. Six females were found in the washings from the Muttuvaratu pearl oysters. Thalestris mysis, CLAUS. Found in the Gulf of Suez and again at Cheval Paar, Ceylon. Pseudothalestris imbricata, BRapy—Plate XI., figs. 19 to 24. This species was described from a single specimen (a male) in the Report on the “Challenger ” Copepoda by Professor Brapy. No further specimens seem to have been discovered until now. In the present collection a single female was found in washings from the Muttuvaratu pearl oysters, which from its general resemblance in structural detail we have concluded is the female of P. imbricata. Length, female 0°65 millim. In general agreement with the necentily described species of this genus, it is more like a small Westwoodia than a Thalestris. The outer branches of the Ist natatory COPEPODA. 273 legs are very small and distinctly 2-jointed. Anterior antenne 6-jointed; pro- Qe 246: Oi i Ave Posterior antenne, mandible, maxilla and maxillipeds similar to those figured by Brapy. Natatory legs 1 to 4 also similar. The 5th legs have a large primary joint and a small secondary joint each furnished with a number of hairs. Furcal rami extremely short, much broader than long. portional lengths as follows : Harpacticus chelifer (MULuER). A common littoral British species. It occurred only once, in a tow-net gathering from Marichchukaddi, Ceylon. Peltidium ovale, n. sp. —Plate XIII., figs. 1 to 6. Length, female 1°6 millim. ; male unknown. Body ovate, cephalothorax and abdomen not clearly separated. Anterior antennz 1. 2. 3.4. 5.6. 13. 16. 10. 6. 2. 6. Most of the joints are densely setiferous, the 3rd and 4th also bearing a long filament. Posterior antennee and mouth organs as in P. purpureum. Outer branch of Ist pair of natatory legs 2-jointed, with marginal hairs on both sides; inner branch 3-jointed, half as long again as the outer, the middle joint about twice the length of the Ist, and the 3rd joint very small, having at the apex two narrow curved claws. In the 2nd, 3rd, and 4th pair, both branches are 3-jointed, the outer branch armed on outer side with lateral aculeate plumose spines; the inner side and inner branch both bearing plumose setee. The 5th pair of legs 2-jointed, the basal joint very small and produced on each side; the outer joint long and stout, with terminal aculeate spines. Three females only were found in the Muttuvaratu pearl oyster washings and in the general washings of Invertebrates. This and the 4 following species all clearly agree with Puitiprr’s original description of the genus except as to the anterior antenne, which he gives as 9-jointed, whereas our 5 new species are 6- and 7-jointed. Seeing that Purirppr knew of only one species, P. purpwreum, we think the generic character should be altered to read—6- to 9-jointed, to admit these new forms. The rounded forehead and the 5th pair of natatory legs sufficiently distinguish this species from the others. Peltidium angulatum, n. sp.—Plate XIII, figs. 7 to 11. Length, 1:2 millim. ; male unknown. Body angular, with large anterior protuberance or rostrum. Anterior antenne ier noe ase Onde Ge Ay SiG. 2s 2ecoy short, 6-jointed, the proportional lengths of joints being as follows : 7-jointed, the proportional lengths being as follows: 2N 274 CEYLON PEARL OYSTER REPORT. First pair of natatory legs shorter and stouter than those of P. ovale; the basal joint of outer branch bears 2 small elongated processes in place of spines. Basal joint of 5th pair produced on one side into a long linear projection with apical spine ; outer joint elongated, narrowing towards apex, armed with strong plain and plumose spines. ‘Two specimens, both females, were found in the Muttuvaratu pearl oyster washings. It differs from P. ovale in the anterior antennze, the Sth pair of legs, and particularly in the arrangement of the chitinous bands or reticulations of the carapace. Peltidium speciosum, n. sp.—Plate XIII, figs. 12 to 17. Length, female 1:1 millim. ; male unknown. Body resembles P. angulatwm in shape, but is differently reticulated, the chitinous bands being thicker. Anterior antenne stout, 7-jointed, the filaments and setz as in pn 2s dea ee Oe 22. 22. 14. 6. 3. 3. 6. First pair of natatory legs very robust. In other respects they and the other pairs agree with P. angulatum. Fig. 17 represents a smaller form with thinner bands. A number of specimens, all females, were found in the Muttuvaratu pearl oyster washings. The jointing of the anterior antennz, and the robustness of the Ist pair of natatory legs, serve to distinguish this species. the two previous species ; the proportional sizes are : Peltidium serratum, n. sp.—Plate XIII, figs. 18 to 22. Length, female 1°6 millim. ; male unknown. Body robust, rostrum broad, with 4 indentations on anterior surface ; margins of all the cephalothoracic segments serrated. Anterior antennze 6-jointed, the proportional Ge os 25 sO. 20. 20. 14. 4. 4. 7. Outer branch of 1st pair of natatory legs robust. Fifth pair foliaceous, 1-jointed, with a long spear-shaped plumose apical spine and several lateral spines, some of them plumose; anteriorly drawn out into a curved protuberance with terminal spine representing a rudimentary basal joint. Three specimens, all females, were found in the. bottom tow-net at Chilavaturai, Ceylon. The character of the reticulation on the carapace and the remarkable 5th natatory legs clearly distinguish this species from others. lengths of the joimts being as follows : Peltidium perplexum, n. sp.—Plate XIII, figs. 23 to 27. Length, female 1°1 millim. ; male unknown. Body and character of reticulation resemble P. speciosum. Anterior antenne 1 age asa epee eae sal ran 232160926. 4535%e 7-jointed, the proportional lengths of joints being as follows: Natatory legs similar to those of P. angulatum. Two specimens, both females, were found in the Muttuvaratu pearl oyster washings. This differs from other species chiefly in the proportional lengths of joints of COPEPODA. 275 anterior antenne. CLEVE has formed a genus Reticulina for the species R. aurivilliz, which is certainly a Peltidiwm, but it is not sufficiently well figured to enable us to compare it with any of the foregoing species. Ilyopsyllus affinis, T. Scorr. Appeared once between Port Said and Suez, and again in the Gulf of Manaar, also at Kodramallai, north of Karativo, and 23 miles south-south-west of Chilavaturai. Porcellidium fimbriatum, Cuaus—Plate XII, figs. 1 to 10. Length, female 0°7 millim. 2. 3. 4. 5. 6. ashore IORCE TTS ee eee ee ORC OTS ee eee Anterior antenne 6-jointed ; proportional lengths of joints Gal. @ A few specimens, all females, of this species, which appear to be identical with Ciaus’ P. fimbriatum, were found in the washings from the Muttuvaratu pearl oysters. The chief points that distinguish this species from the others are the 5th feet, the abdomen, and the fureal rami. Porcellidium brevicaudatum, n. sp.—Plate XII., figs. 11 to 14. Length, female 0°67 millim. ae eee oy) GSRa ter foll I, Be Bs 4 Os & rior antennze 6-jointed, as WS ee : J a ey ie eee This species is easily distinguished from the others by its smooth carapace and ciliated margins, the large 5th feet, the short abdomen, and the furcal rami. Six specimens, all females, were obtained from the Muttuvaratu pearl oyster washings and from the general washings of Ceylon Invertebrates. Porcellidium acuticaudatum, n. sp.—Plate XII, figs. 15 to 18. Length, female 0°6 millim. 36M Ee. Ti, BL GMa, The chief features of this species are its moderately large 5th feet with rounded Anterior antennze 6-jointed ; proportional lengths as follows : apex, the small abdomen produced laterally on each side, and the acutely pointed apex of the fureal rami. Three females of this distinct species were found in the washings from the Muttuvaratu pearl oysters. Porcellidium ravanz, n. sp.—Plate XII, figs. 19 to 22. Length, female 0°6 millim. 2s oa OG: LONIS) Las So: The distinguishing characters of this Porcellidiwm are the moderately wide 5th feet, which taper off to an acute point, the small abdomen, the posterior angles of which are not so much prolonged as in P. acuticaudatum, and the obliquely rounded 2N 2 Anterior antennze 6-jointed ; proportional lengths as follows : 276 CEYLON PEARL OYSTER REPORT. external margin of the furcal rami. Three females of this species were found in the washings from the Muttuvaratu pearl oysters. Idya furcata (BArrp). A common British littoral species. Occurred at 7 stations from the English Channel through the Mediterranean and Gulf of Suez to the Red Sea. Idya longicornis, T. Scorr. Found in the general washings from Ceylon Invertebrates. Previously known only from British waters. Pseudanthessius gracilis, CLaus—Plate XIV., figs. 19 to 23. One specimen was found in the general washings of the Ceylon Invertebrata obtained about the pearl banks. We give some additional figures of this species. Pseudanthessius maximus, n. sp.—Plate XIV., figs. 1 to 11. Length, female 3°5 millims.; male 2°7 millims. Cephalothorax 6-joimted, the lateral spaces between the joints giving it a coarsely pinnatifid appearance. Abdomen of female 4-jointed, male 5-jointed, the Ist segment in the male being much longer and wider than any of the others. Anterior antenne 7-jointed, each joint bearing several short spmous setze, and the Ui 2s Aor NDS SZ Rie eos s 1s Posterior antenne 4-jointed, the 3rd joint much the smallest; the 4th bears a stout proportional lengths being as follows : blunt hooked spine. Mandible is produced apically into a long recurved spine with toothed edges, also a smaller toothed spine, and toothed edge. ‘The palp is short, armed with three apical spines and a lateral one. First maxilliped has a stout basal joint, with an outer joint extended into 2 curved hairy spines. Second maxilliped of female has an oval middle joimt terminating in a short claw; that of the male is a strong grasping hand, the terminal claw long and stout. First pair of natatory legs has both branches 3-jointed, the outer one armed with serrated lanceolate spines ; both branches have numerous plumose setze. Fourth pair 2-branched; the outer one 3-jointed, armed with short ovate serrated spines, the inner branch consists of 1 long joint gradually widening to the apex; the lateral posterior edges are produced into spines, between which are 2 terminal plumose sete. The 5th pair consist each of a long curved joint with 3 terminal plumose spines. Furcal rami about 3 times as long as broad, slightly tapering to apex. Several males and females were taken by surface tow-net in Galle harbour. This species is easily distinguished by its large size, by the mandible and posterior antennee, and by the 4th and 5th pair of natatory legs. COPEPODA. 277 Pseudanthessius chelifer, n. sp.—Plate XIV., figs. 12 to 18. Length, female 1 millim.; male unknown. Cephalothorax 6-jointed, ovate. Abdomen 4-jointed, the Ist joint swollen and rounded anteriorly, narrowing to base. Anterior antennze 7-jointed, the proportional A 2s eA. OM Ou 3 16. 24. 8. 21. 16. 12, 12. Posterior antennee 3-jointed, the apical joint having 3 long terminal spines and a long broad curved terminal claw dentated on upper side. Mandible small, anteriorly extended into a serrated spine; palp large, having 3 terminal spines. The Ist maxilliped narrow, ending in a denticulate spine and a smaller lateral spine. The 2nd maxilliped consists of a long narrow curved joint having 2 small lateral spines and 3 terminal spines. Inner branch of 4th pair of natatory legs consists of one small lengths of the joints being as follows : narrow joint with terminal spine. Furcal rami about 3 times as long as broad. Several specimens, all females, were found about the pearl banks. A very distinct species, readily recognized by its posterior antennz, the 2nd maxilliped and the 4th pair of natatory legs. Pseudanthessius concinunus, n.sp.—Plate XIV., figs. 24 to 30. Length, female 0°85 millim. ; male unknown. Cephalothorax ovate, similar to P. gracilis, but considerably smaller. Abdomen 5-jomted. Anterior antennze 7-jointed, the proportional lengths of the joints being as Wy 8b Be 2 Oe Oe Os Zaks Gi. UO, IG, WAS Co Posterior antennee nearly as in P. gracilis. Mandibles consist of a curved joint, follows : tumid in centre, with narrow, blunt termination. First maxilliped 1-jointed, long, narrow towards apex, with strong lateral and terminal spines. Second maxilliped 2-jointed, the first joint rather longer than broad; terminal joint very small with 2 strong apical spines. Both branches of Ist pair of natatory legs 3-jointed ; inner branch of 4th pair 1-jointed with truncate base terminating in large serrated lanceolate spine and one plain spine; outer branch 3-jointed, having serrated lanceolate spines. Furcal rami long and narrow. One specimen only, a female, was found in the general washings from Ceylon Invertebrata. The mouth organs, the inner branch of 4th pair of natatory legs and the furcal rami are the distinguishing features of this species. Pseudanthessius liber (BRADY and RoBeErtson). Found amongst the general washings of Invertebrates from the pearl oyster beds. Lichomolgus minor, A. Scorr. Found at 2 stations only, and far apart, viz., between Port Said and Suez, and amongst the washings of young pearl oysters, Ceylon. 278 CEYLON PEARL OYSTER REPORT, Lichomolgus gracilis, n. sp.—Plate XV., figs. 1 to 9. Length, male 0°7 millim. ; female 1 millim. Cephalothorax (female) ovate, 6-jointed, abdomen 3-jointed, the 1st considerably longer and wider than the combined succeeding 2 joints. First joint of male abdomen quadrate ; more than 4 times the size of the 2nd joint. Anterior antennee (female) 7-jointed, the proportional lengths of the joints being as ee Ble. 5, Ooo ile CENTS TUE a. 1k, 1h Posterior antennze 3-jointed, the apical joint terminating in a strong curved claw, and having 3 small lateral spines. Mandible has an angular quadrate base, and is pectinated along upper edge; palp short, with 3 spines. First maxilliped has outer joint triangular, sharp and wedge-shaped, and has a serrated curved lateral spine arising from centre; outer joint of 2nd maxilliped (female) very small, with stout apical spines; in the male it is a grasping hand with long curved claw. Inner branch of 4th pair of natatory legs 2-jointed. Furcal rami divergent, about 4 times as long as broad. Several males and females were found in the general washings of dredged Invertebrates. The mouth organs, posterior antennze, and furcal rami sufficiently distinguish this species. Lichomolgus ieversi, n. sp.—Plate XV., figs. 10 to 17. Length, male 0:96; female 1:06. Cephalothorax 6-jointed ; cephalic segment subquadrate; abdomen 4-jomted, the genital segment smaller than in the other species of the genus. Anterior antennz «| 2iSt, WAR MONE GigE 16225.38) 172 b/s Posterior antennze 3-jointed ; the middle jot small; apical joint longer than the combined Ist and 2nd; with four terminal curved spines, two of which are moderately stout. Mandibles long and narrow, coming to a fine point, edges hairy. Terminal joint of Ist maxilliped drawn out, forming a fine ciliated stylet; there is also one lateral spine; 2nd maxilliped (female) 3-jointed, with very short terminal spine ; 2nd maxilliped of male forms a chelate hand with very long rounded claw. Inner branch of 4th pair of natatory legs 2-jomted, the outer branch equals 3 of the inner and has truncated apex; outer branch has 5 lanceolate spines. Furcal rami very long and nearly parallel. About 20 females and 4 males were found in the Muttuvaratu pearl oyster washings and in the Invertebrata washings. The mouth organs, antennal joints, and the furca are the chief distinguishing features of this species, which is named in honour of Mr. R. W. Ievers, Government Agent of the Northern Province of Ceylon, where the pearl banks are situated. 7-jointed, the proportional lengths of the jomts as follows: d aN COPEPODA. 279 Lichomolgus buddhensis, n. sp.—Plate XV., figs. 18 to 24. Length, female 1 millim. ; male unknown. Cephalothorax broadly ovate, about 4 times as long as the abdomen, which is 3-jointed; the genital segment being about 4 times the size of the 2 combined succeeding joints ; it is much swollen in the middle. Anterior antennz 7-jointed, the ee orale On Oka ie WGI, TAI. NO, Mandible and palp short. Maxillipeds and natatory legs similar to P. zeversz. Furca quadrate, very small. Several specimens, all females, were found in the general washings of dredged Invertebrates. The very short abdomen and furca are quite characteristic of this species—named in honour of the celebrated home of Buddhism from which it came. proportional lengths of the joints being as follows : Lichomolgus lankensis, n. sp.—Plate XV., figs. 25, 26. Length, female 1:0 millim. ; male unknown. Cephalothorax ovate. Abdomen 3-jointed; genital segment about as long as the combined two succeeding joints and furca. Anterior antennz 7-jointed, the propor- Money) Ava DiOse fe Do Po oon nay TON a: Posterior antennz, inouth organs, and natatory legs as in L. gracilis. Three specimens, all females, were found in the general washings of dredged tional lengths being as follows : Invertebrates. Its general form, and the comparative shortness of the anterior antennze and furea, distinguish this species from others of the genus. Lichomolgus simplex, n. sp.—Plate XV., figs. 27 to 34. Length, female 0°88 millim. ; male 0°8 millim. Cephalothorax 6-jointed, abdomen (female) 4-jointed, male abdomen 5-jointed, genital segment double in size that of the female; anterior antennze 6-jointed, the We 2b Bo 4 Da Oy 1B, Oe, GO, TE IG. Posterior antennze 3-jointed, the middle one very short; terminal joint 3 times the length of the second, with 2 apical spines. Mandible constricted in centre; outer portion somewhat quadrate, with ciliated edges bearing 2 small corner filaments and a plumose spine. Maxillipeds similar to L. buddhensis, but stouter. Natatory legs as in L. gracilis. proportional lengths being as follows : Fureal rami about 3 times as long as broad. A few specimens of each sex were found in the washings from sponges dredged in the Gulf of Manaar. The general shape of the animal and of the abdomen and furca and the jointing of the anterior antenne serve to distinguish this species, 280 CEYLON PEARL OYSTER REPORT. Lichomolgus elegans, n. sp.—Plate XVI., figs. 8 to 13. Length, female 1°5 millim. ; male unknown. Cephalothorax 6-joimted. Abdomen 4-jointed, the genital segment being longer than the 3 succeeding joints combined, and having a wedge-shaped notch near the centre on each side. Anterior antennz 7-joiuted, the proportional lengths being as le Py.By, 4 By Os 7 1, Cae Posterior antennze 3-jointed, the first joint rather longer and nearly double the width of each of the succeeding joints, The third joint bears a strong apical claw. Maxillipeds resemble L. buddhensts, but are stouter. Inner branch of 4th pair of follows : natatory legs 2-jointed, the outer jot being about double the length of the inner. Fureal rami very short, about as broad as long. One specimen only, a female, was found in the general washings from dredged Invertebrates. The notched abdominal genital segment is the most striking charac- teristic of this species. Lichomolgus robustus, n. sp.—Plate XVI, figs. 14 to 20. Length, female 1°1 millim. ; male unknown. Cephalothorax robust, ovate, 6-jointed. Abdomen 4-joimted; the genital segment about as long as the combined 2 succeeding joints. Anterior antennze 7-jvointed, the Se enon, Aone Ovatihe 1), B25 Ds ibe tis tes. Posterior antenne similar to L. simplex, but more robust. Mandible stylet serrated on outer edge. Maxillipeds and natatory legs like LZ. buddhensis. Furca about half proportional lengths being as follows : as long again as broad. One specimen only, a female, was found in the general washings from dredged Invertebrata. In many points there is a great resemblance between this species and L. buddhensis; but in the jointing of the cephalothorax, and more particularly of the abdomen, and in the small size of the 5th natatory legs in this species, the difference is so considerable that we are justified in separating them. Lichomolgus gigas, n. sp.—Plate XVL., figs. 21 to 26. Length, female 2 millims. ; male 1:4 millims. Cephalothorax ovate, 6-jointed. Abdomen, female 4-jointed; male 5-jointed. Anterior antenne long and slender, 7-jointed; the proportional lengths being as Meese en OL) (k LAS 2 SA lor teeny. Posterior antennz, mouth organs, and natatory legs and furca nearly resemble L. simplex. One of each sex were found in the general washings of dredged Invertebrata. follows : - COPEPODA. 281 The large size and the jointing of the slender anterior antenne sufficiently distinguish this species. Lichomolgus dentipes, n. sp.—Plate XVI, figs. 27 to 30. Length, female 0°86 millim. ; male unknown. - Cephalothorax broadly ovate, the cephalic segment equal in size to the combined 5 following; the edges of the 3rd and 4th segments are finely serrated. The 5th segment is very small, with sharply-pointed lateral terminations. Abdomen very short and stout, hardly 3th the length of cephalothorax ; genital segment as long as the combined 2 following and double the width; 4th joint the same as Ist. Furcal rami equal in length and breadth. F voce : : Io Pe Bs 4 Bo Go Wo Anterior antennze 7-jointed, the proportional lengths being: = UU PAs Gh fe Ze ok 7 Mouth organs as in Paralichomolgus. Inner branch of 4th natatory legs 2-jointed, both jomts straight and very narrow. The 5th pair have each a large tooth projecting from inner side anteriorly. Of this very striking species one specimen only, a female, was found in the general washings of dredged Invertebrata. It is easily recognisable by its serrated thoracic edges and by the 4th and 5th natatory legs—the tooth on the latter gives the specific name. Paralichomolgus, n. gen. Female ; body composed of 10 segments ; cephalothorax rotund or ovate ; 5-jointed ; genital segment much larger than the others, being the 1st and 2nd segments united. Anterior antennze 8-jointed. Posterior antennze, mouth organs, and natatory legs as in Lichomolgus. The difference between this genus and Lichomolqus consists in the lateral prolongations of the body segments and in the jointing of the anterior antennee. Paralichomolgus curticaudatus, n. sp.—Plate XVL., figs. 1 to 7. Length, female 1:2 millims. ; male unknown. Cephalothorax ovate, 5-jointed ; the posterior edges of segments 2 to 4 being pointed. Abdomen very short, about 4th the length of the cephalothorax; genital segment wider than its length and having on each side posteriorly a rounded lobe ; the other joints very small. Furcal rami very small, almost half spheres. Anterior antennze ean Wh Gs (e's 18, 85, 8. BS. 28 Posterior antennze 3-jointed ; the 1st and 2nd joints sub-equal ; the sri as long as the combined Ist and 2nd; terminal claw thick, and obtuse at apex. Mandible and palp as in Lichomolgus buddhensis. Maxillipeds similar to Lichomolgus ceversi, except that the joints of the 2nd are nearly double the width of the latter. Natatory legs also similar to those of latter species ; the 2 joints of inner branch of the 4th PL however, being equal in length to the 3-jointed outer branch, 20 8-joited, the proportional lengths being as follows : 282 CEYLON PEARL OYSTER REPORT. Two specimens, both females, were found in the general washings from the dredged Invertebrata. The short abdomen, the wide joints of 2nd maxillipeds, and the jointing of inner branch of 4th pair of natatory legs readily distinguish this species. Paralichomolgus longicaudatus, n. sp.—Plate XX., figs. 6 to 8. Length, female 1:1 millims. ; male unknown. Body sub-rotund; Ist to 3rd joints of cephalothorax are pointed posteriorly and with a tooth on each lateral edge of 2nd and 3rd; 4th joimt very small. Abdomen about 4+ the length of cephalothorax; genital segment large and tumid; the rest 3 times broader than long. Furcal rami square, very short, with long terminal setz. Ber reese ayy yf, “s)- 16,28) 2) oi ee Posterior antennee, mandible, maxillipeds, and first 3 pairs and 5th pair of natatory legs as in P. curticaudatus. The 2-jomted inner branch of 4th pair natatory legs springs from middle of long basal joint at mght angles; the 3 jomts of outer branch being also at right angles to basal joint. One specimen only, a female, was found in the general washings from dredged Invertebrata. The general appearance and the 4th pair of natatory legs clearly distinguish this species from the last described. Anterior antennz 8-jointed, the proportional lengths being: Hermannella arenicola, BRADY. Found in the general washings of dredged Invertebrata from the pearl banks. Hermannella robusta, n. sp.—Plate XVIL., fies. 1 to 8. Length of female 1'1 millims. ; male unknown. A very robust species with comparatively short abdomen. Anterior antennz 7-jointed ; proportional lengths of joints : Rc ie See ha IG, Ba. O, iO, Ozh The posterior antenna has a short stout hook-like spine arising from the 8rd joint. Mandible and maxillipeds have a general resemblance to the corresponding organs in Lichomolgus. Both branches of Ist to 4th natatory legs are 3-joimted. The 5th legs are rudimentary. Abdomen with 4 segments; genital segment large and tumid, 4th joint longer than the 3rd; fureal rami about twice as long as broad, and slightly longer than the last abdominal segment. This species is easily recognised by the robust body and short abdomen, which is less than a fourth of the length of the body, and by the short furea. Three females — were found in the washings from Ceylon Invertebrates. Hermannella serendibica, n. sp.—Plate XVII., figs. 9 to 11. Length of female, 1:16 millims. ; male unknown. In general appearance more attenuated than H. robusta. Anterior antennz Te BBE Gh A BH 8. 26. 6, 12. 9. 6, 4, 7-jointed ; proportional length of joints : COPEPODA. 283 Posterior antennz, mandible, maxillipeds and natatory legs similar to those of H. robusta. The 5th feet are more developed than in the previous species. Abdomen 4-jointed, rather less than half the length of the body. Genital segment large, much wider posteriorly than in front; 2nd, 3rd and 4th joints subequal in length and each about as long as broad. Fureal rami long and narrow, about 5 times longer than broad and equal to the combined lengths of the 3rd and 4th joints of the abdomen. Three females were found in washings from Gulf of Manaar sponges. This Hermannella is easily identified by its attenuated form, long abdomen, with the peculiar swelling of the genital segment, and long furea. Hersiliodes leggii, n. sp.—Plate XVII, figs. 12 to 21. Length of male 1°5 millims. ; female unknown. Meee ee AR Bl Ue MW, 77, BO, 1S, G, 12. Posterior antenna 4-jointed, similar to that of other Hersiliodes. Mandible strong, with a well-developed biting part. Maxilla more developed than in Lichomolgus, and bearing a number of strong apical sete. The first maxilliped has the terminal joint strongly toothed and also furnished with a setiferous digit. The second maxilliped Anterior antennz 7-jointed; the proportional lengths are : well developed, in general appearance resembling that of other species of the genus. Both branches of Ist to 4th natatory legs are 3-joimted. Fifth legs foliaceous, subquadrangular in shape, rather longer than broad, and furnished with 3 dagger- like spines and 1 seta. Abdomen 5-jointed, fully half as long as the body. Furcal rami short, about as broad as long. One specimen in washings from Gulf of Manaar sponges. This species, which we name after Captain Lreccr, at present Inspector of the pearl banks, is easily recognised from any other member of the genus by the proportional lengths of the joints of the anterior antennze and by the quadrangular 5th legs. Hersiliodes tamilensis, n. sp.—Plate XVII., figs. 22 to 25. Length, female 1:3 millims.; male unknown. In general appearance resembling the previous species. Anterior antennze 7-jointed; proportional lengths of the SS On ao) On On he OL, &, EO ea, Posterior antennze, mandible, maxilla, and 1st maxillipeds nearly as in H, leggit. Terminal joint of 2nd maxilliped armed with 2 moderately strong spines and 2 small sete. Natatory legs 1 to 4 somewhat similar to those of H. leggu. Fifth legs long and narrow, about 3 times longer than broad, and armed with 3 dagger-like spines and 1 seta, Abdomen 5-jointed, fully half as long as the body. Genital segment long and broad, widest near the middle; 2nd joint quadrangular in shape, about half as long as the genital segment; 3rd, 4th, and 5th joints shorter than broad, and in combined 202 joints : 284 CEYLON PEARL OYSTER REPORT. length equal to the 2nd joint. Furcal rami short and wide, about as broad as long. In washings from Muttuvaratu pearl oysters. The proportional lengths of the joints of the anterior antennz, and the long and narrow 5th feet, distinguish this species from any of the others. Hersiliodes dubia, n. sp.—Plate III., figs. 18 to 27. Length, male 1:8 millims. ; female unknown. Cephalothorax quadrate in form, composed of 5 segments. Anterior antennz 6-jointed, and all clothed with non-plumose setze; the proportional lengths are as Is eb Sho Bb (ob hh (Oh Dy Bh 25 lsh Posterior antennze 4-jointed, the basal joint equalling in size the 3 following. Mandible with 2 horizontal plumose projections and 2 plumose sete. Maxilla with 3 terminal spinous sete, and 4 on the outer side, 2 of them plumose. First maxilliped 2-joited, the apical jomt terminating in a strong curved claw and a plumose spine on each side. Second maxilliped 2-jointed, the basal one with a rounded papilla ; the hand angularly curved on outer side, terminating in a long rounded claw bluntly rounded at apex, and having on under side 3 spine-like setee. follows : First 4 pairs of natatory legs 2-branched, each having 3 joints with the edges mostly clothed with fine hairs. Fifth pair each consist of a quadrate jomt with 3 strong spines and a few hairs and sete at base. Abdomen rather shorter than the cephalothorax, 5-jointed, the genital segment very large, nearly square, and having hooked posterior lateral terminations. Fureal rami linear, about 4 times as long as broad, with a small spine on each outer side and terminating in 3 setee of unequal lengths. One specimen only, a male, was taken in the Suez Canal. This species agrees, in most particulars, with Canu’s Hersiliodes. Canv, however, gives 7 joints in the anterior antenne, although his careful drawing of H. pelseneeri shows only 6 joints. It is evident that the species comprising the genus Hersiliodes undergo considerable changes in their various ecdyses, and in the absence of an adult female we can only provisionally place our species in this genus. Famity: ONCEID. Oncea venusta, PHILIPPI. Oncea media, GIESBR. Oncea minuta, GIESBR. Oncea mediterranea, CLAUs. All the.above were generally distributed over the entire voyage. ©. media was found only once about Ceylon, viz., at Mudalaikuli Paar. O. mediterranea occurred COPEPODA. 285 twice in Ceylon, viz., at Muttuvaratu Paar and at Talaivillu Paar. O. venusta was taken at 10 and O. minuta at 5 Ceylon stations. Oncea subtilis, GIESBR. Oncea notopus, GIESBR. Oncea conifera, GIESBR. Three rarer species. O. subtilis occurred at 3 Mediterranean stations; O. notopus between Port Said and Suez, and O. conifera in the Northern Indian Ocean. Lubbockia squillimana, CLAUS. Occurred at 4 stations in the Gulf of Suez and Red Sea, and once off Minikoi. Famity: CORYCASID A. Coryceus venustus, DANA. Highteen species of the genus Coryceus are included in the collection. C. venustus was obtained in fair numbers throughout the entire voyage, occurring at 42 stations. Coryceus rostratus, CLAUS. Occurred at 5 Mediterranean stations. Coryceus dane, GIESBR. Taken at 22 stations, from the Mediterranean onwards. Coryceus furcifer, CLAUS. Taken at 2 Mediterranean stations, twice in the Indian Ocean, and at 5 Ceylon stations. Coryceus flaccus, GIESBR. Occurred at 7 Mediterranean stations and once in the Indian Ocean. Coryceus elongatus, CLAUS. Taken once in the Mediterranean, twice in the Red Sea and once in the northern Indian Ocean. Coryczus speciosus, DANA. Generally distributed throughout the voyage, and taken at 5 Ceylon stations. Coryceus lubbockii, Girspr. Found at 8 stations, in Mediterranean, Indian Ocean and 4 localities round Ceylon. Coryceus carinatus, GIESBR. Occurred 5 times, viz., Mediterranean, Gulf of Suez and Indian Ocean, off Minikoi and south of Cheval Paar, Ceylon. 286 CEYLON PEARL OYSTER REPORT. Coryceus ovalis, CLAUS. Taken at 11 stations in the Mediterranean, Red Sea and northern Indian Ocean. Coryceus obtusus, DANA. Coryceus gibbulus, GrEsprR. Coryceus longistilis, Dana. Similar in range of distribution, occurring from Suez to Ceylon at 47, 41 and 16 stations respectively. CC. longistilis however occurred only once about Ceylon, viz., south of Adam’s Bridge, the others being generally represented round the island. Coryceus concinnus, DANA. First appeared in the Indian Ocean, where it occurred at 13 stations, and at 5 Ceylon localities, Coryceus gracilicaudatus, GIESBR. Similar in range to C. concinnus, but it first appeared in the Red Sea. Coryceus robustus, GIESBR. Taken once only, in the northern Indian Ocean. Coryceus tenuis, GIESBR. Occurred at 3 stations, viz., in the northern Indian Ocean, off Negombo, and at the Cheval Paar pearl banks, Coryceus longicaudis, Dana. One specimen was found at Muttuvaratu Paar, Ceylon. Copilia mirabilis, Dana, Found in the Mediterranean, Gulf of Suez, Red Sea, at 6 stations in the Indian Ocean, and once at Ceylon, south-east of Cheval Paar, Sapphirina ovatolanceolata, Dana. Ten species of the genus Sapphirina occur in the collection, the majority bemg represented at only 1 or 2 localities. |S. ovatolanceolata was the most widely distributed, and occurred at 12 stations, extending from the Mediterranean to the Red Sea and Indian Ocean as far as Minikoi. Sapphirina gastrica, GIESBR. Occurred twice, viz., in the Red Sea, and again from Perim into the Indian Ocean. Sapphirina ovalis, Dana. One specimen was taken in the Indian Ocean after leaving Perim, and another south of Adam’s Bridge, Ceylon. COPEPODA. 287 Sapphirina nigromaculata, CLAUs. Occurred at 6 Indian Ocean stations, and south of Cheval Paar, Ceylon. Sapphirina metallina, Dana. Sapphirina salpe, CLAUS. Sapphirina auronitens, CLAUS. Sapphirina bicuspidata, GIESBR. Sapphirina intestinata, GIrESBR. Sapphirina sinuicauda, Brapy. One or two specimens of each of the above were taken in the Indian Ocean, with the exception of S. s¢enwicauda, which was taken at Vankali Paar, Ceylon. Famity: ASTEROCHERID. Asterocheres stimulans, GIESBR. Asterocheres dentatus, GIESBR. Asterocheres minutus, CLAUS. Several specimens belonging to each of the above species were obtained in the general washings from Ceylon Invertebrates and also in washings from sponges collected in the Gulf of Manaar. Asterocheres manaarensis, n. sp.—Plate XIX., figs. 11 to 20. Length, female 0°78 millim. ; male unknown. Cephalothorax ovate, 6-jointed, the 5th joint very small. Abdomen 3-jointed ; genital segment subquadrate, larger than the two following joints together. Anterior antennze 20-jointed, the relative lengths of the joimts being as follows :— i @ B&B OS 10, Ue I TE, TN Ge 19), 0. TON OR II iy MAB O Sat The 17th joint has a long filament, the others profusely setose. Posterior antennee, maxilla, and maxillipeds similar to Asteropontius typicus. Mandible consists of a long scythe-like spine, without biting teeth, and a 2-jointed palp, the smaller apical joint bearing two terminal plumose sete. Both branches of Ist pair of natatory legs 3-jointed; Ist joint of outer branch has a large posterior plumose spine; 3rd and 4th joints of inner branch are toothed on inner side. Inner branch of 4th pair 3-jointed, the apical joint terminating in a large serrated lanceolate spine; the inner side of the joints toothed. The 5th pair each consist of a ciliated oblong joint. Furea short and stout, broader than long. Two specimens, both females, were found in the washings from Gulf of Manaar sponges. Asterocheres major, n. sp.—Plate XVIII, figs. 21 to 28. Length, female 1*1 millim.; male 1 millim. 288 CEYLON PEARL OYSTER REPORT. Body nearly circular in outline. Cephalothoracic segment large. Anterior antennee a ; proportional lengths of joints :— . 2, 3. 4. 5, 6. cE 8. 9. 10, U1. 12. 13. 14, 15. 16, 17. 18 19. 20. 12, B. A, 3. AL LAL 5 7 San een en Posterior antennee, anise and palp, maxilla, maxilliped, and natatory legs, Ist to 4th, nearly as in other Asterocheres. Fifth feet very narrow, about 34 times longer than broad, furnished with three apical sete. Abdomen 3-jointed, about 4 the length of the body, joints of ee ye length, genital segment slightly longer than the 2nd joint, last joint about 2 the length of the second. Furea very short, about as broad as long, and eee the length of the last abdominal joint. The male is slightly smaller than the jonas and has the anterior antenna only 17-jointed. The genital segment of the abdomen is slightly longer than the combined lengths of the next 2 joints. A number of specimens in washings from material collected off Point de Galle. This species is easily recognised by its circular body and narrow abdomen. Asterocheres minor, n. sp.—Plate XVIIL, figs. 29 to 31. Length, female 0°8 millim. ; male 0°7 millim. In general appearance very like Asterocheres major, only much smaller. Anterior ye cee e proportional lengths of joints :— Bb oe Be eGo Os WOE TL RR ES Uy. BRIE SS 20) sic HONS AG ALIS SS94; a aes ee ae Other appendages anes to A. major. The distinguishing characters of this species are the difference in the proportional lengths of the joints of the anterior antenne, the different propornonal lengths of the abdominal joints and the furca, the latter being about $ the length of the last abdominal joint. Several specimens in washings from Gulf of Manaar sponges. Asteropontius, n. gen. Cephalothorax roundly ovate, 5-jointed, the cephalic segment larger than the combined lengths of the 4 following segments. Anterior antennz 18—19-jointed. Abdomen 3-jointed. Outer branch of posterior antennz 4-jointed, a small 1-jointed branch springing from the 1st jomt. Maxilla 2-branched. Mandible long and narrow ; palp 1-jointed. Maxillipeds and natatory legs, Ist to 5th, as in Asterocheres. Asteropontius typicus, n. sp.—Plate XIX., figs. 1 to 10. Length, female 0°96 millim. ; male unknown. Cephalothorax roundly ovate, about twice the length ee abdomen ; genital segment COPEPODA. 289 as long as the other 2 abdominal joimts combined; tumid in centre. Furea very short. Anterior antenne 19-jointed, all clothed with short setose spines; the 17th carries a long narrow ae, The proportional lengths of the joints are as follows :— woe 4. 5, Os. Fo Bo Bo IO, Ti. ‘12. 13. 14. 155 1G, 7, We, 19 (OM SES ewe Sal 7h 7) RTT 7288 io anh Mandible long, narrow, with 5 biting teeth at apex: palp 1-jointed, with long terminal plumose setze. Maxilla 2-branched, the smaller one half the length and half the width of the larger branch, both bearing long terminal plumose setee. Maxillipeds and Ist to 5th natatory legs as in Asterocheres; basal jomt of outer branch of Ist pair has a broad lanceolate spine on apex of outer margin. Several specimens, all females, were found in the washings from Gulf of Manaar sponges, and in the general washings of Invertebrates. The species bears a general resemblance to Asterocheres, but the 19-jointed antennee and the 1-jointed mandible palp separate it therefrom. Asteropontius attenuatus, n. sp.—Plate XVIIL., figs. 11 to 20. Length, female 0°92 millim. ; male unknown. Body attenuated, very narrow in front. Cephalothoracic segment triangular in outline, nearly twice as long as the combined lengths of the 1st, 2nd, and 3rd thoracic segments. Anterior antennze 18-jointed, with a large sensory filament on the end of the 17th jomt. Proportional ee of the ae — Tos 2 AL B®, © Wo Bs 10. il. 12. id. 15. 16. 17. 18. in PMO MOONS! . LG, ae @, 0G) 0, 12, 10, Posterior eS ae maxilla, maxillipeds, and Ist to 4th natatory legs’ nearly as in Asteropontius typicus. Fifth feet long and very narrow, about 6 times longer than broad, and furnished with 3 apical setee. Abdomen 3-jointed. Genital segment longer than the combined length of the next 2 joints. Anterior portion tumid. Furcal rami short, about 24 times as long as broad, and equal to the length of the last abdominal joint. Two specimens were found in washings from Ceylon Invertebrates. This species is easily distinguished from A. typicus by its attenuate form and the long narrow 5th feet. Collocheres giesbrechti, n. sp.—Plate XVIIL, figs. 1 to 10. Length, female 0°67 millim. ; male unknown. Body elongate, sub-ovate ; cephalothoracie segment with a rounded forehead and about equal to twice the lengths of the Ist to 3rd thoracic segments combined. Anterior antennze 20-jointed, with a sensory filament on the end of the 18th joint. Proportional lengths of the joints :— i Be 4 Gh Ge eb Os WOR HS We se ly ey, GE ye itso). AO) oman se 4: 3.4. (850 LAT bn Vel Vy 8.) 8. 9.) 5b 2, 2 P 290 CEYLON PEARL OYSTER REPORT. Posterior antennve, mandible and palp, maxilla and maxillipeds and natatory legs nearly as in C. gracilicauda. Fifth feet 2-jointed, 2nd joint slightly curved, long and narrow, furnished with 2 sub-apical sete on the outer margin, one sub-apical seta on the inner margin and one apical seta, on each side of which there is a distinct -tooth-like projection of the foot. Abdomen narrow, 4-jomted. Genital segment longer than the combined lengths of the 2nd, 3rd and 4th joints. Furcal rami short and narrow, about 24 times longer than broad. Two specimens in the washings from Ceylon Invertebrates. This species is easily distinguished from the other members of the genus by the lengths of the joints of the anterior antennze, the shape of the 5th feet and the furea. We have much pleasure in naming the new Collocheres after Dr. GiEsBRECHT, whose monograph on the Naples Copepoda belonging to this peculiar family has done much to simplify their study. Scottocheres elongatus (T. and A. Scorr), Scottocheres longifurca, GiEsBR. Both found in washines from Ceylon dredged Invertebrates. 5 y S Lepeopsyllus, n. gen. Body oval, thin and scale-like, composed of 4 segments. Abdomen 3-jointed and completely covered by the last thoracie segment. Furca completely covered or only partly covered by the same segment. The margin of the carapace is thickly lined with papilla-like prolongations, of irregular length, which probably impart strength to this region, Siphon long, reaching to about the end of the last abdominal joint. Anterior antennee 13-15-jointed. Outer branch of posterior antennze 4-jomted ; inner branch long and blade-like. Mandible rudimentary, consisting of a long hair attached to a short slender basal joint ; palp 2-jointed, the joints long and of about equal length, the outer one covered with minute hairs. Maxilla consists of 2 separate lobes attached to the ends of a long basal joint. Maxillipeds nearly as in the other Asterocheridee. Both branches of Ist to 8rd paws of natatory legs 3-jomted; outer branch of 4th pair 3-jointed, the inner consisting of a mmute knob with one hair; 5th pai each consist of a long curved hairy appendage. Furea divergent, long and narrow. Lepeopsyllus typicus, n. sp.—Plate XIX., figs. 21 to 29. Length, female 1°48 millims. ; male unknown. Anterior antennze 15-jointed, the proportional lengths of the joints being as follows : ak sy By hy Be Os Fe So OE WO; il, WS, WR 1G 15, MEM eseey a LN a ek Joint 12 bears a long fine filament. COPEPODA. 291 The other characters are the same as those of the genus. Furcal rami long and divergent, extending a little beyond the edge of the carapace. One specimen, a female, was found in the Muttuvaratu pearl oyster washings. This species has a longer and less rounded body than the succeeding one, the only known species for which it could be mistaken. The jointing of the anterior antennee also serves to distinguish it. Lepeopsyllus ovalis, n. sp.—Plate XIX., figs. 30 to 33. Length of female 1-4 millims. ; male unknown. Carapace more rotund than in LZ. typicus but otherwise very similar. Anterior antennee 13-jointed, the proportional lengths of the joints being as follows :— I, Bo B 4 Bs Gs. Ho By Ob 1O, Wis Wey Wes mil, 10, We Ae a Oe The other appendages are practically the same as those of L. typicus. Furea are entirely covered by the carapace. Two specimens, both females, were found in the general washings from dredged Invertebrates. Besides the difference in shape of the carapace, the jointing of the anterior antennze serves to distinguish this species from L. typicis. Doropontius, n. gen. Body nearly circular ; cephalic and thoracic segments produced laterally into strong points. Abdomen of the female 3-jointed, anterior antennze 17-jointed. Posterior antennee as in Asterocheres manaarensis. Mandible, maxilla, maxillipeds and Ist-4th pairs of natatory legs as in Asterocheres. Fifth pair of natatory legs 2-jointed. Doropontius denticornis, n. sp.—Plate XX., figs. 1 to 5. Length, female 0°9 millim. ; male unknown. The cephalic segment shield-shaped, forming about } of the entire animal. Second and 3rd thoracic segments have each an obtuse lateral tooth. Abdomen short ; genital segment about twice as broad as long, laterally excavated to form an upper and a lower tooth, the latter rounded posteriorly. The 2nd and 3rd segments together hardly equal in length to the 1st, and about twice as broad as long. Anterior antenna 17-jointed, the proportional lengths of the. jomts being as follows :— 1, 2, Bh ab By 6. W/o GE Os Wik, We as Ue Wy IGS IZ, MMC SMR MMSINGNGlenyei 7) GVeulOss Sui q6) ue The lower margin of the 4th joint is prolonged into a strong pointed tooth, and the 14th joint bears a long filament. Furcal rami quadrate, rather longer than broad. A few specimens, all females, were found in washings from Gulf of Manaar sponges [no 74; N74 292 CEYLON PEARL OYSTER REPORT. and in the general washings of Invertebrates. The pointed cephalic and thoracic segments, the anterior antenne, and the 3-jointed abdomen are the characters which distinguish this genus and species, Cletopontius, n. gen. Body broadly ovate, the cephalic segment forming about ? of the entire body. Abdomen 3-jointed. Inner branch of posterior antennze 2-joited. Mandible stylet-shaped, palp 1-jointed. Maxilla and maxillipeds as in Asterocheres. First, 2nd and 3rd pairs of natatory legs 2-branched, both branches 3-jointed; 4th pair composed of 1 branch only. The characters of this genus do not agree in all respects with any of the known sub-families of the Asterocheridz, and a new sub-family may therefore be required for its reception. Cletopontius serratus, n. sp.—Plate XX., figs. 9 to 18. Length, female 0°8 millim. ; male unknown. Lateral edges of 1st and 2nd thoracie segments bluntly serrated. Abdomen small, the genital segment being about equal in size to 16 of either of the 2 following joints, Anterior antenna 18-jointed, the proportional lengths of the joints being as follows :— We Pees 945 65 > Oo eb Bs JIM) Wily eee bebe) io, 7/5 ist. MOMs CHUM EMIGH Ma aK(h Cyn eknyen tz) 3 The 4th joint is faintly divided into 3, the 16th joint bears a long filament. Inner branch of posterior antenna 2-jointed; the apical joint less than $ the length of the basal joint. The other characters as those of genus, which readily distinguish it. A few specimens, all female, were found in the general washings of dredged Invertebrates. Bradypontius siphonatus, GIEsBR. Found in washings from Ceylon dredged material. Artotrogus orbicularis, Borck. One specimen was in the general washings from Ceylon dredged Invertebrates. Stephopontius, n. gen. Body sub-quadrate, a strongly marked dividing line separating the cephalic — segment from the thoracic joints; all have rounded margins. Abdomen of female composed of 1 joint ; that of male 3-jointed. Anterior antenna of female 6-jointed; the male antenna is 2-jointed, the apex forming in conjunction with the extremity of the basal joint what appears to be a strong clasping organ, COPEPODA. 293 Posterior antenna 1-branched. Mandible stylet-shaped; palp 1-jointed. Maxilla represented by a stout plumose spine. Maxillipeds as in Asterocheres. First pair of natatory legs each composed of two 1-jointed branches, the outer branch very small ; 2nd and 38rd pair 2-branched, both 2-jointed ; 4th pair 1-branched, having 2 joints. In 5th pair each consists of a lamella. Stephopontius typicus, n. sp.—Plate XX., figs. 19 to 31. Length, female 6°7 millims.; male 8 millims. Second thoracic segment in female has a terminal lateral appendage on each side ; this is absent m male, which has a prolongation of the last thoracic segment on each side of the abdomen. The 1-jointed abdomen in female has a small protuberance on each side at the genital opening. Male abdomen 3-jointed, very small. Anterior antenna of female 6-jointed, the proportional lengths being as follows :— ll, By th 2b Be ~ Ob 13, 1G, Gy Sarees: Posterior antenna 4-jointed, the apical jot bearing a broad spine with wide trifid The terminal joint bears a long filament. end. Other characters as in the genus. Furcal rami very small, spherical in male ; knob-like in female. A number of specimens, both males and females, of this very striking form were found in the general washings from dredged Invertebrates. Its general appearance, the male anterior antenne, and the Ist, 2nd and 5th natatory legs prevent its being mistaken for any other known species. Fami~ty: ERGASILID Ab. Bomolochus scomberesocis, Kr. One adult female with 2 larval forms attached to vulva was taken from the gills of Curane leptolepis from Aripu, Ceylon. Bomolochus unicirrus, RIcHIARDI. Several specimens, male and female, were found in the gill chambers of Amphisile scutata, Linn., from Ceylon. Famity: CALIGID . Caligus dakari, VAN BENEDEN. Several specimens were taken from the mouth of Arius venosus caught in Palk Bay, Ceylon. Caligus diaphanus, NorpMANN. Several were found about the mouth and attached to the dorsal fin of Therapon puta from Aripu, Ceylon. 294 CEYLON PEARL OYSTER REPORT. Caligus benedeni, Bassurr-SMiTH. Found attached to the inner surface of operculum of Sciana diacanthus from Palk Strait, Ceylon. Lepeophtheirus thompsoni, Barrv. Found associated with Caligus dakar: in the mouth of Arius venosus from Palk Bay, Ceylon. Famiry: CHONDRACANTHID. Chondracanthus cornutus, MULLER. One only was taken from the gills of Cynoglossus oligolepis, from co Ceylon. Chondracanthus cynoglottidis, n. sp.—Text, fig. 1. Length, female 4°65 millims. (excluding ovisacs); male unknown. Head rounded, 2-lobed, as wide as the widest part of the body. Body constricted for about 5 of its length, when it expands in width, 3 again narrowing towards the posterior end, and terminating in short strong spines. Anterior antennze unjointed, about 3 times as long as broad. Posterior antennze consist of 2 gracefully curved spines. Two pairs of lateral prolongations (rudimentary appendages), having on under side of each a small rounded tubercle, spring from the constricted part of the body. A pair of long wide ovisacs, equalling in length the Fig, 1. entire animal, are attached to the posterior end. Chondracanthus : 3 y 2 cynoglottidis, Specimens were found attached to the nasal ececum in Cyjoglossus brachyrhynchus and C. brevirostris by Mr. J. JOHNSTONE, who obtained for us this series of 11 fish-parasites while examining the collection of Ceylon fishes in the Zoological Department of Liverpool University. Famity: LERNAOPODID. Brachiella thynni, Cuv. Attached to gills of Chirecentrus dorab, from Palk Strait. Brachiella merluccii, BASsSeT?T-SMITH. From grooves underneath the head of Sevena diacanthus from Palk Strait. Anchorella uncinata, MULLER. Found under head in the folds of operculum of Gazza equuleformis from Palk Bay. COPEPODA. 295 EXPLANATION OF PLATES. PLATE I. Fig. 1. Ldyewayia typica, n. gen. et n. sp., female, from left side. x 80. Fee De .; 3 last thoracic segment, from left side. x 160. a 5 es anterior antenna. x 123. Bie As Fi 5 posterior antenna. x 220. Basie 55 5 mandible and palp. x 220. Pe GE ~ ae maxilla. x 220. nica! Be - 1st maxilliped. x 220. Be 8 aA 5 2nd a x 220. 9 | 1 95) lst natatory leg. x 220. » 0, 3 Bs 2nd “ 220 elias a = 4th a x 220. yy Led *5 = 5th A x 220. OS: 59 is abdomen and furea, from above. x 53. » Ll4. Centropages tenwrcimis, n. sp., female, from above. x 40. oy lla’ 3 » 5th pair of natatory legs, female. x 106. oy Os = 3 right anterior antenna, male. x 53. edad: aA = 5th pair of natatory legs, male. x 106. aloe 3 » abdomen and furea (male), from above. x 53 » 19. Centropages dorsispinatus, n. sp., female, from above. x 53. (0! 3 cephalic segment, from left side. x 53. mp ile * 0% basal joints of anterior antenni, female. x 106. aes 3 3 5th natatory leg, female. x 106. yy eee bs s right anterior antenna, male. x 53. wae Hi 3 5th pair of natatory legs, male. x 106. oy eB i ss abdomen and furea (male), from above. x 53. PLATE IL. Fig. 1. Pontellu dane, var. ceylonicu, female, from above. x 32. 2: 5 si » rostrum. x 80. » 3. ” » 5 inner branch of Ist natatory leg. x 159. ee: 53 “1 5 5th pair of natatory legs. x 80. ee: 5 0 , abdomen and furea. x 53. » 6. Labidocera kroyeri, vax. gallensis, male, 5th pair of natatory legs. x 59. ag) Ls ” 3 5, last thoracic and Ist abdominal segments. x 53. PS: 7 var. styliferu, male, 5th pair of natatory legs. x 53. pe WE 9 last thoracic and 1st abdominal segments. x 55. » 10. Lulidoceru pectinulu, n. sp., female, from above. x 40. » Ii. ” ” m1 rostrum. x 106. » 12. ” ” “5 inner branch of Ist natatory leg. x 160. » 13. ” 33 50 5th pair of natatory legs. x 106. oy alee _ 5 Fe abdomen and furca. x 80. » 15. Pontellopsis herdmani, n. sp., female, from above. x 40. vos is a » rostrum. x 80. bw 6 a bo bo co Lo 1 CM CEYLON PEARL OYSTER REPORT. Pontellopsis herdmani, n. sp., female, 5th pair of natatory legs. Metacalanus uuivilli, CLEVE, female, 5th pair of natatory legs. ” 0 abdomen and furea. Pseudodiuptomus sulinus, GIESBR., female, 5th natatory leg. ” ” x BDZ. x 106. x 5b. 9 99 , male, 5th pair of natatory legs. x 159. x 159. % male, 5th pair of natatory legs. x 159. a ;, abdomen and furea. Pseudodiaplomus aunwilli, CLuve, female, 5th natatory leg. Sunuristes nopinala, n. 2 ” 5 ,, abdomen and furea. PLATE III. sp., female, from left side. i anterior antenna. , Ist natatory leg. yy arsl 5 ” 4th ” Sunuristes longipes, n. sp., female, from left side. ” ” Sunuristes curticamduta, n. sp., female, from left side. bP) ” : dubia, 1. sp., male, from above. Tegastes imthurni, n. sp., female, from right side. x 80. x 159: x 159. » male, 5th pair of natatory legs. x 159. x 156. x 90. x 120. x 120. », last abdominal segment and furca. x 60. x 159. x 195. x 60. male, apical joints of anterior antenna. female, 5th natatory leg. x 390. x 80. » 4th natatory leg. x 120. » last abdominal segments and furea. x 80. 7 5, anterior antenna. x I11. . » 2nd natatory leg. x 120. 5 5 Bal 3 x 120. ay ala _ x 120: . » last abdominal segments and fuvea. x 45. » anterior antenna. x 90. » posterior antenna. x 180. » Mandible. x 260. » wesc, — se QR, » Ist maxilliped. x 260. end . x 90 » Ist natatory leg. x 120. 4th 5 x 120. » Bila A x 180. PLATE IV. x 106. another female, from left side. x 159. female, anterior antenna. x 199. » 2nd manilliped. x 195. » Ist natatory leg. x 136. Seeeend 3 x 90. x 90. a SSS Oo ST cs et iE ee BS L — Pw COPEPODA. 297 Tegastes imthurni, n. sp., female, 3rd natatory leg. x 60. a * oy abo es x 60. 5 35 oy el 5 x 60. Tegastes donnuni, n. sp., female, from right side. x 159. ee 5 » anterior antenna. x 390. » » » oth natatory leg. x 90. Tegustes twynami, n. sp., female, from right side. x 106. » a » anterior antenna. x 60. i BS » 2nd maxilliped. x 260. * » Oth natatory leg. x 181. Teqastes chalinerst, n. sp., female, from left side. x 159. a a 3 anterior antenna. x 781. 5 % » 2nd maxilliped. x 320. 50 s » Ist natatory leg. x 500. ” ” 9 4th i x 500. » 90 uly Fe x 500. PLATE V. Stenhelia brevicornis, n. sp., female, from left side. x 106. anterior antenna. x 368. ” oP} ” 59 % » posterior antenna, inner branch. x 276. te A mandible and palp. x 276. ” % oe 2nd maxilliped. x 368. 58 6 » Ist natatory leg. x 276. ” ” ” 4th ” eal. ” ” ” 5th ” x 276. 59 as * last abdominal segment and furca. x 159. Stenhelia gractlicaudata, n. sp., female, from left side. x 159. » anterior antenna. x 276. ” ” a 5 ns lst natatory leg. x 276. i a eee 4th x 276. “I FA ee oth a x 276. 3 i a last abdominal segment and furea. x 159. Stenhelia longicornis, n. sp., female, from left side. x 106. anterior antenna. x 221. bb) ” ” ” » i Ist natatory leg. x 221. ” ” ” 5th ” se BA, ” » 9 last abdominal segment and furca. x 104. PY * male, 2nd natatory leg, inner branch. x 221. ” ” ” 5th ” ” x 221. Ane minor, nv. sp., female, from left side. x 159. ” on 56 anterior antenna. x 335. 2 “4 $0 posterior antenna, inner branch. x 552. 55 " os mandible and palp. x 552. ” » “ Ist natatory leg. x 276. ” ” ” 5th ” x 33D. oe a FF last abdominal segment and furca. x 330. 2 Q 298 bo bb bo eS) ROS) y= © se 18. OI Tm oe to CEYLON Stenhelia perplera, u. sp., female, from left side. ” ” ” ” ” th) ” ” ” ” ” ” Stenhclia dentipes, n. sp., female, from left side. ” 3) ” ” ” ” ” ” ” ” ” ” Ameira tenwipes, n. »” ” ” ” » ” ” ” ” ” Stenhelia minuta, n. sp., female, from left side. ” ” ” ” ” ” Parastenhelia hornelli, n. ” Ceylonia uculeata, a gen. et sp., female, from left side. gen. et sp., female, from left side. PE] sp., female, from left side. ” ” 0 ” ” ” ” ” anterior antenna. posterior antenna, inner branch. PEARL OYSTER REPORT. PLATE VI. xe ays) x 390. x 530. x 260. anterior antenna. 2nd maxilliped. lst natatory leg. 4th 5 x 260. 5th - x 260. last abdominal segment and furca. x 260. x 159: basal joints of anterior antenna. x 781. x 390. x 260. 2nd maxilliped. lst natatory leg. 4th Fs x 260. 5th x x 390. last abdominal segment and furca. x 159. x 390. x 390. x 390. x 390. x 390. x 159. x 260. x 390. x 390. mandible and palp. Ist natatory leg. 5th - anterior antenna. Ist natatory leg. 5th 7 PLATE VII. x 106. x 260. x 260. x 390. x 390. 260. 195. 195. 260. 260. 5» anterior antenna. » posterior antenna. »» mandible and palp. i 2nd maxilliped. » Ist natatory leg. x » 4th 3 x Buh - x male, 2nd 53 x oul 53 x x 106. x 390. x 390. x 390. » anterior antenna. ») posterior antenna. » mandible and palp. x 260. a 1st maxilliped. i 2nd . = Ist natatory leg. Fr 4th “A 3 maxilla. x 260. x 780. x 260. x 195. bo bo 1 bo iv) 1 co OO -~I bo ou wm co fer) | (loo 2) 0. TTP OR O89 bo Ceylonia aculeata, n. gen. et sp., female, 5th natatory leg. last abdominal segment and furca. COPEPODA. 9 male, 3rd natatory leg. ou PLATE VIII. Laophonte hirsuta, n. sp., female, from above. ” anterior antenna. x 106, mandible and palp. 2nd maxilliped. x Ist natatory leg. x 4th a5 5th 5 x et sp., female, from above. » from left side. x 19 36 Gey x 390. x 260. posterior antenna, inner branch. 9D: 395, 395. 395: 260. x 106. » anterior antenna. x » 2nd maxilliped. » Ist natatory leg. oy axe! » 4th UR ” Tetragoniceps dubia, n. sp., female, from left side. x anterior antenna. 2nd maxilliped. Ist natatory leg. 4th ; 5th Ke from left side. x anterior antenna. 2nd maxilliped. x Ist natatory leg. 5th 50 x x x x 106. x 260. x 395. x 195. x 195. x 260. 159. x 520. 780. x 260. x 156. 5. x 106. 395. x 395. 260. 260. 260. 260. last abdominal segment and furea. PLATE IX. Dactylophusia dentata, n. sp., female, from left side. ‘ anterior antenna. ,, mandible palp. 2nd mawxilliped. » lst natatory leg. i 5th + last abdominal segment and furea. ” x 80. = A 2215 x 22), x 184. x 221. x 221. posterior antenna, inner branch. 2nd natatory leg, inner branch. DD x 90. x 395. x 195. G x 2. Os RO ea bw b& eo bt bb b&b b&b bo bt SO OTD HK co — 2% : i=} (=) bo SU) bo hho ob SS mg CEYLON PEARL OYSLER REPORT. Dactylophusia havelocki, n. sp., female, from left side. x 80. anterior antenna. x 159. 99 bh} >] Pe 0 » posterior antenna, inner branch. x 260. ” % ,, mandible palp. x 260. y 5 55 2nd maxilliped. x 260. ” yD » Ist natatory leg. x 195. ” ” py = Bi 9 x 130. ” 3p 9 last abdominal segment and furea. x 130. Dactylophusia hirsuta, n. sp., female, from left side. x 80. A - 3 anterior antenna. x 195. 55 my “ 2nd maxilliped. x 195. 3 3 Bh Ist natatory leg. x 156. if 55 5th 5 4 Uo An ., 35 last abdominal segment and furea. » 111. Dacetylophusia eeylonica, n. sp., female, from left side. x 64. as 9 An anterior antenna. x 156. 2 rs 5 2nd maxilliped. x 156. 55 3 5 Ist natatory leg. x 156. ” ” ” 5th 2 x 98. AS a male, Ist . inner branch. x 98. e 53 = 2nd . 5 x 156. 56 r s 5th x5 ue x 130. PLATE X. Dactylophusia hamiltoni, n. sp., female, from left side. x 80. i F 3 anterior antenna. x 120. » 3 55 posterior ,, x 18]. > 3 ps 2nd maxilliped. x 260. 5 5 55 Ist natatory leg. x 195. 3p ee * 5th x x 195. 5 3 is last abdominal segment and furca. x 181. Parastenhelia similis, n. sp., female, from left side. x 106. 5 i 3 anterior antenna. x 260. > 9 5 2nd maxilliped. x 390. 33 . » Ist natatory leg. x 260. » 39 Paar Sih . x 195. % Be A 5th 5 _ 33 2D), 5 5 55 last abdominal segments and furea. x 260. Stenhelia knoxi, n. sp., female, from left side. x 106. 59 $6 % anterior antenna. x 390. 90 s Ae lst natatory leg. x 390. ” » 35 5th 3 x 195: Dactylophusia robusta, n. sp., female, from left side. x 159. Bs “5 5 anterior antenna. x 390. " A 3 2nd maxilliped. x 390. 5p ss " Ist natatory leg. x 260. » on aS 5th i x 260. » 9 », last abdominal segments and furca. x 260. — TDR ww ay, 19, Dactylophusia laticaudata, n. sp., female, from above. COPEPODA. PLATE XI. x 159, , $5 33 anterior antenna. x 260. se 35 3 posterior antenna, inner branch. x 260. 4 FA si mandible palp. x 260. - * . 2nd maxilliped. x 260. ii “A a lst natatory leg. x 260. % . 4th . x 260. - nt * 5th ‘ x 260. Daciylophusia emula, n. sp., female, from above. x 159. % a & anterior antenna. x 390. 5 ne be lst natatory leg. x 260. 33 3 5 5th 5 x 260. Dactylophusia platysoma, n. sp., female, from above. x 106 if aA 4 anterior antenna. x 390. 5 Bs ‘hs 2nd maxilliped. x 390. . ‘ a Ist natatory leg. x 260. ) 0 0 4th A x 260. » 99 55 5th 7 ae So Pseudothalestris imbricata, BRADY, female, from left side. x 159. 5p Fn “3 anterior antenna. x 390. 25 5B . 2nd maxilliped. x 260. 99 dg es lst natatory leg. x 195. " 9 5 5th ‘ x 195. 0 3 Ps last abdominal segment and furca. x 395. PLATE XII. Poreellidium finmbriatum, Cuaus, female, from above. x 106. 5 3 a anterior antenna. x 260. 98 5 55 posterior antenna, inner branch. x 260. us be a mandible and palp. x 195. 5 5 ° 1st maxilliped. x 396. a 5 s 2nd i x 396. 5 5 5 Ist natatory leg. x 260. 8 oo atl 5 x LOD: 0 se Ms 5th 1 x 195. > * » abdomen and furea. x 180. Poreelludium brevicaudlatum, n. sp., female, from above. x 106. 95 5 x anterior antenna. x 260. 36 ks 5 Sth natatory leg. x 260. _ x i abdomen and furea. x 195. Porcellidium caeuticaudatum, n. sp., female, from above. x 106. 6 fe 5 anterior antenna. x 260. a 9 ‘ 5th natatory leg. x 195. 56 is abdomen and furea. x 195, Porcellidium ravane, n..sp., female, from above, x 106, to bp Ww Sa) bw tw Ww bw bv SID St oe ho oe nT UR ge Porcdllidium varvane, n. sp., female, anterior antenna. ” ” CEYLON PEARL OYSTER REPORT. Fr abdomen and furea. PLATE XIII. Peltidiwm ovale, n. sp., female, from above. x 40. Le ” ” 9 ” 3) anterior antenna. x 195. 2nd maxilliped. x 95. Ist natatory leg. x 95. 4th 45 x. 9D: 5th 5 x 9D: Peltidinm angulatum, n. sp., female, from above. x 53. ” » anterior antenna. x *% 260. 5 5th natatory leg. x 195. x 156. 195. 2nd maxilliped. x 95. », Ist natatory leg. x 95. 5 | atin 5 x 195. Peltidium speciosum, n. sp., female, from above. x 53. anterior antenna. x 195. 2nd maxilliped. x 95. » Ist natatory leg. x 120. ” 5th ”? , asmaller form, with thinner bands. Peltidium servatum, n, sp., female, from above. x 40. anterior antenna. x Ynd maxilliped. x 9 Ist natatory leg. x 5th 35 x Peltidiwm perplecum, n. sp., female, from above. x 40. », anterior antenna. , Ist natatory leg. x 9 Soa ” 5th ” PLATE XIV. Pseudanthessius maximus, n. sp. female, from above. x ” ” Pseudanthessius chelifer, n. sp., female, from above. ” 2 43 anterior antenna x 2nd maxilliped. x 9 xe Mish 21. s posterior antenna. 5 mandible and palp. x 156. x 120. 1st maxilliped. . 2nd = % Ist natatory leg. 4 4th a 3 5th = male, 2nd maxilliped. ob) » anterior antenna. x x 90. x 90. x 90. x 60. x 90. x 90. 90. abdomen and furea. x 30. x 80. x 260. x 64 ” ” — to lo pw bo we ew bo bo Ww bw bt SO ONS Te — Ol me oo bo -~T or) COPEPODA. Pseudanthessius chelifer, n. sp., female, posterior antenna. x 156. % « » mandible and palp. x 260. 4 ks BS 1st maxilliped. x 260. Pm 33 a 2nd 45 x 260. a -. ~ 4th natatory leg. x 156. Pseudanthessius gracilis, CLAUS, female, from above. x 80. 59 59 Fe anterior antenna. x 260. 9 7 ‘ posterior _,, x 195. i % Ff 2nd maxilliped. x 180. ¥ ‘ 5 4th natatory leg. x 195. Pscudanthessius concinnus, nu. sp., female, from above. x 80. “s Bn 5 anterior antenna. x 260. Ys oy . mandible. x 260. 6 3 B lst maxilliped. x 395. cp w % 2nd * x 395. » 51 » lst natatory leg. x 195. ” " 3) 4th i x 195. PLATE XV. Tichomolgus gracilis, n. sp., female, from above. x 80. 90 #5 » anterior antenna. x 260. a a »» posterior antenna. x 260. 99 2" » mandible and palp. x 395. a ss » lst maxilliped. x 395. a 35 aan a x 260. 9 5) » 4th natatory leg. x 156. “5 53 male, 2nd maxilliped. x 181. ” 9 ,, abdomen and furca. x 90. Lichomolgus teversi, nu. sp., female, from above. x 80. i, A » anterior antenna. x 260. >) 9 » posterior antenna. x 260. Wa _ » mandible. x 395. i me » Ist maxilliped. x 260. SS 5 yroeeend Ys x 260. 9 » » 4th natatory leg. x 156. 5 » Male, 2nd maxilliped. x 180. Lichomolyus buddhensis, n. sp., female, from above. x 80. oH 0 » anterior antenna. x 156. SF 59 » posterior antenna. x 78. 6 3 » mandible and palp. x 260. co » 1st maxilliped. x 260. ” 5 x eal i x 195. 5 = » 4th natatory leg. x 156. Lichomolgus lunkensis, n. sp., female, from above. x 80. ” cA » anterior antenna. x 260. Lichomolyus simplex, n. sp., female, from above. x 80. ” °p » anterior antenna x 260. ” ” », posterior antenna. x 195. 303 9 JvU. ol. 32. Oo. o4. a Sea antnanse 11. Gy me) RS) Sy oO Mm aT O _— L He O92 In lon CEYLON PEARL OYSTER REPORT. Lichomolgus siinplex, vw. sp., female, mandible. x 260. » i » Ist maxilliped. x 260. As Ps py hate xs x 260. y os » 4th natatory leg. x 195. 55 , male, abdomen and furea. x 90. PLATE XVI. Paralichomolyus curticaudutus, n. gen. et sp., female, from above. x 80. » + » anterior antenna. x 195. ” 9 » posterior antenna. x 90. s Ps ,, mandible and palp. x 260. ” » lst maxilliped. x 260. ” 5 ay | Patel x 260. ” 3 » 4th natatory leg. x 195. Lichomolqus elegans, n. sp., female, from above. x 53. ” 3 », anterior antenna. x 130. ” 9) 5 posterior antenna. x 120. ») 3) » 1st maxilliped. x 195. ” ¥ ez Ps x 195. » 59 » 4th natatory leg, inner branch. x 90. Lichomolgus robustus, nu. sp., female, from above. x 80. 99 * » anterior antenna. x 156. » 50 5, posterior antenna. x 156. B ie » Mandible. x 260. 90 BS » Ist maxilliped. x 260. ” » we and * x 260. ” » » 4th natatory leg. x 195. Lichomolgus gigas, n. sp., female, from above. x 53. mn 5 » anterior antenna. x 98. 2 7 » posterior antenna. x 90. % » 1st maxilliped. x 260. - . » 4th natatory leg. x 60. % s» Male, abdomen and furca. x 45. Lichomolgus dentipes, n. sp., female, from above. x 80. » » 5 anterior antenna. ;. » 2% » 4th natatory leg. x 195, » ” 5 thy, x 156: PLATE XVII. Hermannclla robusta, n. sp., fermale, from above. x 80. 3 . 9 anterior antenna. x 130. » » » posterior antenna. x 156. ” 39 % mandible. x 195. 23 3 » Ist maxilliped. x 195. 39 re a 2nd \y Se WE % a 0 ist natatory leg. x 156. ” ” ” 4th >» x 156. COPEPODA. 305 Fig. 9. Hermannella serendibica,-n. sp., female, from above. x 80. SOs 3 Fr “i anterior antenna. x 130. pan! ut 3 posterior antenna. x 156. » 12. Hersiliodes leggii, n. sp., male, from above. x 54. tos op = », anterior antenna. x 120. op dléb, e 5 » posterior antenna. x 90. elle o ys » mandible. x 260. o UG Pe i » maxilla. x 195. ral ie 3 3 », lst maxilliped. x 195. else % 5 55 aval 3 x 130. > IDs 5 3 » Ist natatory leg. x 90. op) 2AO, % $3 oy Akela i x 130. = elle m * | BD cs x 111. » 22. Hersiliodes tamilensis, n. sp., female, from above. x 66. “9 Bb 5 FA 55 anterior antenna. x 120. » 24: 66 5 a 2nd maxilliped. x 120. x AM “A * “s 5th natatory leg. x 156. PLATE XVIII. Fig. 1. Collocheres giesbrechti, n. sp., female, from above. x 159. Bo 82 iy 5 » anterior antenna. x 260. ee oy si », posterior antenna. x 260. Se AR i io » mandible and palp. x 390. eA DE rs . » maxilla. x 260. ape 20 4 » Ist maxilliped. x 390. aye eel ¥3 a 1 aval a x 260. aes. 5 - » Ist natatory leg. x 260. aig iD: oF) 0 thi ve x 260. Peels 5 3 moun 5 x 395. 11. Asteropontius attenuatus, n. gen. et sp., female, from above. x 106. 5 ll 5 is », anterior antenna. x 195. lo: 5 i », posterior antenna. x 156. a eds i Fe », mandible and palp. x 156. LO: < 3 oy enema, — $¢ isa, LG: y ‘5 » Ist maxilliped. x 260. py. Lt. 55 3 x aha! * x 260. ple 5 ue » Ist natatory leg. x 195. 5) 29. re 53 ny ited re x 195. a nO! 53 3 9 al “4 x 260. » 21. Asterocheres major, n. sp., female, from above. x 80. yee: 5 < Fr anterior antenna. x 156. Be) ABE * 3 os posterior antenna. x 195. yy 4s " Fs 5 mandible and palp. x 195. eb f 61 a maxilla. x 195. “pete * Fe a 4th natatory leg. x 120. ee 7 3 3 5th s x 130. ry) CANE 5 » Male, anterior antenna. x 156. Ane whole a 4 » abdomen and furca. x 80. 2R CoS Ce ys Go SS so 17. ee SS we cw toe -~T a bo bo bb bt bo PN bo b> pw bo eC) Ste ys Go bof Be CEYLON PEARL OYSTER REPORT. Asterocheres minor, n. sp., female, from above. x 80. , . » anterior antenna, x 195. 55 », male, abdomen and furca. » 80. PLATE XIX, Asteropontius typicus, n. sp., female, from above. x 80. 9 oA 5 anterior antenna. x 195. » ff » posterior antenna. x 195. ” ” 56 mandible and palp. x 195. ” Py ) maxilla. x 390. ” ZF 3 Ist maxilliped. x 195. » 9 3 2nd 5 x 195. ” 3 » Ist natatory leg. x 195. » ) “p 4th 5 lO: ” 99 » Oth f x 195. Asterocheres manaarensis, n. sp., female, from above. x 106. ” oA i anterior antenna. x 195. ” D » posterior ,, x 195. ” » ,, mandible and palp. x 195. ” 2 ~p maxilla xsl OD: ” % 55 lst maxilliped. x 195. ” 35 2nd 3 SalOD: * er » Ist natatory leg. x 195. » 5 - 4th inner branch. ” 2" 5 oun RS x 195: Lepeopsyllus typicus, n. gen. et sp., female, from above. x 53. » > » anterior antenna. x 195. » » », posterior ,, x 156. ” oS » mandible and palp. x 156. ” 3 5 maxilla. x 260. 59 FF nS Ist maxilliped. x 90. 5 3 a 2nd B: x 90. » 35 Ist natatory leg. x 111. ” * eee eth is se Tink, Lepeopsyllus ovalis, n. sp., female, from above. x 53. B *s 5 anterior antenna. x 195. ” » » 4th natatory leg. x 111. 99 7 By 5th 5 SaRLOD PLATE XX. Dovopontius denticornis, n. geu. et sp., female, from above. x 80. ” .s ,, anterior antenna. x 195. » 5 » Ist manxilliped. x 90. ” 59 55 2nd $5 x 90. » 39 a Ist natatory leg. x 195. Paralichomolgus longicaudatus, n. sp., female, from above. x 106. » » >) anterior antenna. x 195. ” ” » 4th natatory leg. x 195. COPEPODA. 307 Fig. 9. Cletopontius serratus, n. gen. et sp., female, from above. x 80. ~ JO; by % ss anterior antenna. x 260. Sees le 7 9 6 posterior antenna. x 260. ae DE _ 3 “ mandible and palp. x 195. op Lek * 3 5 maxilla. x 195. Pee i PA 55 2 Ist maxilliped. x 195. ay allay in 55 3 Ist natatory leg. x 195. mo UG: he 5 * 3rd b x 195. elie + FA < 4th ms x 390. es 5 5 BS 5th eS x 260. » 19. Stephopontius typicus, n. gen. et sp., female, from above. x 80. 20! #s “ male ¥ x 80. earls ” ” female, anterior antenna. ~x 520. Moor 5 5 male la x 195. xy By Me i female, posterior antenna. x 260. spun cas nf 5 i mandible and palp. x 260. oy PAD 3 i 5 maxilla. x 395. 4 DB: “4 ss fs Tst maxilliped. x 195. ah ele 3 + » 2nd = x 195. so Asks > 55 ; Ist natatory leg. x 395. es 5 oF 5 2nd 3 x 260. — oro); na ny is 4th 5 x 260. 9 Bll Fe Pe , 5th i x 156. Ir is with deep sorrow that I have to record the sudden death of my friend and fellow-worker, the senior author of this Report, just as his last sheets were passing through the press, and too late for any change to be made elsewhere in this volume. Mr. Isaac THompson’s many scientific friends, who have known and appreciated his work on the Copepoda, will share the feelings of regret which Mr. Andrew Scott, the jomt-author, and I desire to express that this Report should have proved to be his last piece of scientific work. Wig Abr ele LONDON: HARRISON AND SONS, PRINTERS IN ORDINARY TO.HIS MAJESTY, ST. MARTIN’S LANE. LOM) Ml) CORRE POMA | iL IEP OYSTER EMLON) PAIR: MParlane & tcskine Lith, F , N Figs. 19-25, CENTROPAGES DORSISPI NUIREMIS. 5 on fay g ee (e) ee g vA ica) (=) = = na 2 fy 4 =| a Pal io | ae mS ce a — Cc ae a o4 ise) COPEPODA, PLATE II. — ' ES SS of SSP xx“ pn 4A \ SSE geal 4 26. JHA AY | | si | McFarlane & Erskine Lith, Edm? ELLA DANAE, var. Ceviowica. Fics. 6.7, LABIDOCERA KROYERI, var. GALLENSIS . : YLUFEF Fics.10-14, LabipOCERA PECTINATA . Fies.15-]7, PONTELLOPSIS HERD S. 21-23, PSEUDODIAPTOMUS SALINUS, Giese. FIGS. 24-26, PSEUDODIAPTOMUS ic yy a ae SO egy *. Pie Was WTA kee phe aes = es: CSE eS SS SS M‘Parlane & Erskine,Lith. Edin? UNARISTES INOPINATA, Fres. 9-ll, SuNARISTES LONGIPES. ARISTES CURTICAUDATA. Fics. 18-27, HERSILIODES DUBIA. Ln LON PEARL OYSTER REPORT. COPEPODA, PLATE Von wane ae OA ty SEQOeS ‘ M‘Farlane & Erskine, Lith, Edin” Fies. 1-9, TEGASTES IMTHURNI. Fics. 10-12, TEGASTES DONNANT. Figs.13-16, TEGASTES TWYNAMI. Fics. 17-22, TEGASTES CHALMERSI, AMI aM cick WR, COPEPODA. (PEATE Name MFarlane & Erskine, Tath. Edint Fies. 10-1, STENHELIA GRACILICAUDATA. Ve ; LONGICORNIS. Fics. 25-29, AMETRA MINOR. CGOMPIBIPO) IVA. PIL/AIE, Wl, i= . , MParlane & Erskine, Lith. Edint Fics.1-7, STENHELIA PERPLEXA Figs. 8-14, STENHELIA DENTIPES. ‘i Fics. 15-20, AMEIRA TENUIPES. Fics. 21-24, STENHELIA MINUTA. i Ak id eels * ie mae ee Tee Cw Bees VE) a COPEPODA, PLATE VIL a Pais M's) COPEPODA, PLATE VI. Fics. 1-8, LAoPHONTE HIRSUTA. Fics. 9-16, LAOPHONTELLA TYPICA. _ Fies.17-22, TETRAGONICEPS DUBIA. Fics.25-28, TETRAGONICEPS MINOR. TER REPORT, COLE LOD AM Ais mle Pal MSFarlane & Erskine, Lith, Edin? Fie¢s.1-10, DAcTYLOPHUSIA DENTATA. Figs. 11-18, DactYLOPHUSIA HAVELOCK!. Fics.19-24, DACTYLOPHUSIA HIRSUTA. Fics. 25-32, DACTYLOPHUSIA CEYLONIGA. War bth! ina ye ea, COPEPODA, PLATE X. _ McFarlane &Erskine Tith. Edin! USIA HAMILTONI. Figs. 8-14, PARASTENHELIA SIMILIS. f i lta aN Figs.19-24, DACTYLOPHUSIA ROBUSTA. ric y re) en aN ‘LOPHUSIA LATIGAUDATA. Fics. 9-12. DacryLOPHUSIA A:MULA. i SIA PLATYSOMA. Fics.19-24, PSEUDOTHALESTRIS IMBRICATA Loe Cee te NOR MER aT ieee eR (0 ae OM . : 1 ~ de a] PEARL OYSTER REPORT. Os 90> G ey Ssssny SSasxy SSN as > Ni NEN WS Sr >. * F MFarlane & Erskine Lith. Edin? Fies.1-10. PoRcCELLIDIUM FIMBRIATUM,Ciauvs. Fries. ll-14, PoRcELLIDIUM BREVICAUDATUM. Fies.1618, PORCELLIDIUM ACUTICAUDATUM. Fres.19-22, PoRCELLIDIUM RAVAN . ay eve ten, ay aii! COPEPODA, PLATE XI MsFarlane & Evskine, Lith, Edin™ Fies.J-6, Perriprium OVALE. Fies.7-ll, PELTIDIUM ANGULATUM. PeLtipium speciosum. f[ies.18-22,Pre1ripium SERRATUM. Fics. 25-27 PELTIDIUM PERPLEXUM. Bet ae oes PEARL OYSTER REPORT COPEPODA, PLATE XIV. Marlane kErskine, Lith Edin* ( Fies.1-ll, PSEUDANTHESSIUS MAXIMUS. Fi¢s.12-18, PSEUDANTHESSIUS CHELIFER. Fics.19-23, PSEUDANTHESSIUS GRACILIS,Cisus. Fics. 24-30, PSEUDANTHESSIUS CONCINNUS. OLGUS IEVERSI. Fes. 27-34, Lich Stith) weak al ‘UM A a ‘ues Andrew Scott, del. i MiParlane & Eréhine, bith. Edin® in Fics.1-8. HexMANNELLA ROBUSTA. : Figs. 9-1], HERMANNELLA SERENDIBICA. TiGs.l2-21, HERSILIODES LEGGII. Figs. 22-25, HERSILIODES TAMiLENSIS. Ye ida! Me lay, Ad ae le OYSTER REPORT. Mifurlane &Ershing, Lith Edin” Fics.1-10, CortocHeres Giesprecutt. Fics. 11-20, AsteRopontiusS ATTENUATUS, Figs. 21-28, AsvEROCHERES MAJOR. Frcs, 29-31, ASteROCHERES MINOR: ‘ PEARL OMS TERE RE POU, COIPIRIZOIDAL IPILAVINE, XW LLL Lg M‘Farlame & Erskine, Lith. Edin® 3l. Ties.11-20, AStEROCHERES MANAARENSIS. Fics.d0-33, LEPEOPSYLLUS OVALIS. Fies.1-10, AStEROpONTIUS TYPICUS. Fics. 21-29, LEPEOPSYLLUS TYPICUS. Eile Fics. 6-8, PARALICHOMOLGUS LONGICAUDATUS. Fics.19-31, SrEPHOPONTIUS TYPICUS. a os a qr iY Breage “ /Prghe shah ita patent ae ati dite tite pik igeeeotnriatte f mth a iis? i y cht isial fa ett tnt aise acetone iianetaciasnheth ct eietgne tee eck Caleta ice isuahaet ie esheaesttoere) se dlnent dans teaoat Fire per Hekate list ie i e pina teliedt peel fy a eats y " 1 tf teh a et set ) eubeietaeaty ee Le esata th poyegerters seri teal pt Sent ah ptt it iy hat <4 fe as ery teal brink he ete Settewatts fot wet had seed. Hat bed oh Gove at Haat mie AH Sewn bt Batt f hyo] iabaets i phege rath o ety eee ete vohierpen Saber v4 etteiae phat * I rheeiyiigecthretyantes geapebibeenslias aay nea Petey tat hteminp ry fet oy i hen ot Mtubaae! 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