bees View ate errr een ae Eee oo ~afa Owe Cee ere Bre Se = Se ee SS “Pot fh LLL 4 ak a Sef we 4 ache wed Ee betcha od lore we iguses' =< oS SRIF ARS S Ar SS fied hdres NA eo vue Wave vues : I 2 ee Ne Sere ut AS hag Oe ihn haps AL vw IIE “A ih Y a vw Ney ad Oa Na) Nl wed te = v. wwe w w ove WWW ore we vw w Se hd Jn_w wt wt lag ‘ wSr é ~ “sy ted oe Se Suvse “ v} us se " lw ~ Tks ; es we ~7 7 we nae baler as tN IN DAYS : : at OW LOVED VEN, ow ~ oY wy CULV Coriey yee WOU Oe Si mR w By =o wi WS e STS Nahe oe: Vous Wyv= BAY a SEESS yer Spurs roots tet IIITS, SESE yp Wy tig we yaw POG ALS IS, ~ Aah petit A 7 — - is ae VA we eS Wee ws SA ag IK PS wes ; ESS ~w Be SR hh edhe ith ey Se Rohe SELEY S S\N Tw See PRA DTA Fee Nee ve ley iil y vey. oe vere, See Sy WSS Own Vdonwy SASSI wee SS HM pg RR Wi wyedtesey tuugde hd ydte wey Ce aire SUT T See ete ie rete ITS oe é Sess ieee SP Sees! Bee 4 “Uo. ~ = ww o™) 7 med eer Me as - OS nr eee | eee hhet pad TITAS © hbk peeled ded blah ee ew re he ow OC—~—NT Ltr = 4 a > q -— * ¥ AT \ \ ¢F Ag al Fe "FRA Yo. ‘ \ ¢ 7 “¢ \. ately \ A Aaa g a o& Ts ‘ ha) WON 4 ‘ te A y (4 a rP?, (ff “4% . 2 IF a we a al - Ae aia ana mannh AAR Aas, > i \ an. 4 ‘ 7 a FE GRRL, EP : » ~ 1 L ¥ ? | at ) Ba) igs 1 - . oi > | RA 24 Ry fot gaaaaenn ‘aa het Lem ‘aaa > Vee PR ce, ! aa ~ = aaa Pr } alae at 7 N a) eX gf! vy As: aan a = a aN Lond mal - im "i Se NX > ~ a ~~ aA NA AA ae P| = ae ~ > | rv) qa Nees am en Y oN = . a orn i 6 if, Ss A cay a =a NA Ae NAA aA. : _~ ae _ 5 ARAMA A Anana aN ~~ ( - qe ¢ ‘ ‘ A\ : we A) ~N Ap Ay, ~AV Aaa gal meals! |. By Ly pa” wnoat | = ey! RAS pra ~~ a, AA -— = aA ~ a a NY 8A im aA AaC | AAA. ” ~Se \ a ae -s a, > B Xx - ~ see a ene = , a4 ir \E \ “ | Vom 7 ¥ a . A APIS ~ “, - =! - A Ama sk min ain a Ang PARRY \ Am ae NE a\ elle | cw >= ae, \ P i yk CRAY 2 Oy» Hey) S10 OS ate Ha Oia say Ma A ey mint) is) 5 i ; ‘ ‘ j : r ‘ a9 Sy i wt . . ny ’ ‘ ¢ ce} q ih i ¢ i oe ‘ ‘ A R . ‘ i. 7 ql f ; i) P py . 4 Ree Plauen Seay 6 Ac Sooty CMenoghap‘ra )) St on te. Bak Csi cates af Ts. Rates 4 Vakangls | Ottos. [s1e-&6 ‘e / eS a nena Institue P| 2423594 Ba oetional Muses | Hm CO 0 OL PLATE I. Zone of Arietites Buckland. . Artetites Buckianonr, Sowerby. Lateral view. Half natural size. From the Ironstone beds at Scunthorpe, north-west Lincolnshire. My collection. . Front view of the same Ammonite. . Enlarged figure of the foliations of the septa. . ARIETITES sEMIcostatus, Young and Bird. = ARIETITES GEOMETRICUS, Oppel. Lateral view. Natural size. My collection. . View of the siphonal area, showing the compressed sides and angular keel. 6. Enlarged figure of the foliations of 4. semicostatus. . Young shell, smooth like 4. planorbis; being the four inner whorls of A. sEmicostatus. My collection. . Young shell, in which ribs are developed in early life. My collection. AGawan lith Let emt, a Lh " aa i} Ms t i Ws y ae “ \ en f or ae ‘ j _ iy) ies . PRD Ny f Mi f fi ; Roig \ rn ¥ 4 f ke . i i a j m vine ) , Set ey! 1 ye Py i } Ca eee Lo ry PLATE II: Zone of Arietites Buckland. Fie. 1. Artetites ConyBeart, Sowerby. Lateral view. Half natural size. My collection. 2. Front view of the same Ammonite, showing siphonal area and bisulcations, im same proportion. 3. Foliations of the septa magnified. This fine type shell was obtained from the Great Western Railway cutting at Saltford near Bath when the line was making. A magnificent specimen of this species, nearly as large as a small carriage wheel, from the same locality, collected by me, is now in the British Museum. Pea A.Gawan lth. AMAL S Wp i ‘ ' Wie 8 f: ap ‘ oy) ‘ ra “ F x ; , ti ; ' PLATE III. Zone of Arietites Bucklandt. Fie. 1. Arretitus Bisutcatus, Bruguiére = ARIETITES MULTICOSTATUS, Sowerby. Lateral view of a fine typical specimen, showing the foliations of the superior and inferior lateral lobes. Collected at Frethern-on-Severn, Gloucestershire, by John Jones, Esq., and now in the Museum of the School of Art and Science, Gloucester. 2. View of the siphonal area of the same Ammonite, showing the foliations of the siphonal lobes zz sztz. 3. An accurate outline of the foliations of the septa, showing the siphonal, superior lateral, inferior lateral, and auxiliary lobes. 4 AGawan bth, PLATE IV. Zone of Arietites Buckland. Fie. 1. ARIETITES BIsULCATUS, Braguiére = muLTicostatus, Sowerby. Lateral view, natural size, of a typical specimen from the Lower Lias, near Berkeley. My collection. | 2. Front view of the same, showing the position of the siphuncle. 3. View of the siphonal area of the same, showing the bisulcations on each side of the keel, the tubercles on the ribs, and their angular curvature forwards on the margin of the siphonal area. 4. Accurate outline of the foliations well seen in this specimen. A.Gawan hth. he: ys ‘tt o | ¢ rasa | Mi RTs Ley ft i ys Cau a ae ne RUG ree } PLATE V. Zone of Arietites Bucklandi. Fre. 1. ARIETITES ROTIFORMIs, Sowerby. Lateral view, natural size, of the original type specimen figured by the late Mr. James De C. Sowerby in the ‘Mineral Conchology’ in 1825, from an example collected near Yeovil, and now in the British Museum. ‘This fossil has a very rugged surface, owing to the shell having become decomposed in patches on the ribs and other parts. . View of the siphonal area of the same specimen, with the siphonal foliations 2 situ: Natural size. . Front view of the same, showing tubercles, keel, and bisulcations. Natural size. . View of the siphonal area of a large example from Lyme Regis, showing the shell-structure, keel, bisulcations, and siphonal ribs. Natural size. wo os PLATE cs Si A. Gawan hth. Hanhart amp. eh bb 1 ie sae Mie le 20: ent ate) t is He Pith ih) Hi es rae ary v oS a5 yah a wast ag Ne i wae) i er ¥t a. ik Hex rh seit Y 130 Fa A ni | nl Ad ieee - LA ah ¥ ay. til) Ou tf 4 eye i, ¥ ‘iG y i ' sal fa ‘i : ha “ue Ys, YY) & itt Fi ng nin; . i } 2 ee en aot ty ie eS ee at PAOD balk SALT, UO BIRR ‘ee 7 é ° y b ae (heey ‘ 4 ne? ae oe ry iti ii / 4 LE \ i ee Pa , ? 4) eee R a iG wel, UL 7 j } ie. ‘ ee ; . 4 | , , PLATE VI. Zone of Amaltheus oxynotus. Fic. 1. ARigritEs DENoTATUS, Svmpson. Lateral view. Natural size. The finest specimen known; from the Leckenby Collection, Woodwardian Museum, Cambridge. 2. ArIETITES NoDULOosUS, Young and Bird= AnrteritEs opesuus, Blake. Lateral view of a small perfect specimen, magnified two diameters, collected from a brown sandy rock, Robin Hood’s Bay. My collection. 3. View of the siphonal area.of the same shell, showing the line of tubercles on the margin, with the oblique-forward directed ribs arising from the tubercular series. ‘The outline of the foliations of the lateral lobes is well shown in Fig. 2, and the siphonal lobes are remarkable for their great elonga- tion, and are seen in Fig. 3, where the superior lateral, inferior lateral, and auxiliary lobes are shown 2m siti. Zone of Arietites Bucklandi. Fie. 4. Arretrtes Brooxt, Sowerby. Lateral view, natural size, of a very beautiful Ammonite, with the shell-structure in fine preservation, and showing the lines of growth on its surface. My collection. 5. Accurate outline of the foliations of Arietites Brooki from another specimen, as none are visible in Fig. 4, in consequence of the presence of the shell all over the mould. My collection. Hanhart imp ay a vate i¥ ts Rilt uh, pak i | pA PLATE VII. Zone of Arietites Buckland. Fic. 1. Arretites Rotirormis, Sowerby. Lateral view of another specimen in the Sowerbyan Collection in the British Museum, entirely denuded of shell, and showing the mould forms of the ribs and tubercles. Natural size. Zone of Arietites raricostatus. Fig. 2. Arrerires raricostatus, Zieten. Lateral view, with much of the shell preserved ; from a fine specimen in the British Museum. Natural size. Locality unknown. 3. View of the siphonal area of the same shell, showing the keel and the disappearance of the ribs after they turn the border. 4. Front view of the same shell showing like characters. Natural size. . Form of the foliations in this species. 6. A smaller individual of the same species, in my collection, to show the size of the air-chambers and the distance the septa are from each other. OU Hanhart imp AGawan hth. : ; 4 we fe a! ih tikes >, SOMMER ENE: 4 st) ys Nite: i Bes ss Speen Lake te Bat. A Ve ut) re : oe “ es VASP Os te ie RTS a ae j Mi 5 are! i) ie vs Y ; i f NOW INNS Ge Bier i y CRASS Oe a . f : f 4 : ; / - * rae ry * : ee is 3 "Se Mee Rae SCs ot 1 EAST i | tt thn a NERS eo REV ES pines Pht eis SSL ; ; MF Z ai Tah = 4 7 e ‘ tothe ty 2 ¥, ye , i ato) , y j mi ? i ‘ Ti na 7 . ti \é Te Bye bn | SHU TER Fined ly AMER LSTA ahi? x é ay PE ‘ il. ; . * evan TAtsitia met Ui ARAM Nt) feo Wigan ead ' 1 * MU } Bits : f v, } , . x rae Pee Lae ¢ - ; 1 5 1 Se i } i re joke d ‘ Fig. 1. Se) PLATE VIII. Zone of Arietites Buchlandi. ArietiTus Sauzeanus, d’ Orbigny. A large specimen, in my collection ; collected at Bredon, Midland Railway cutting, Gloucestershire. Lateral view natural size, showing the rib-flexures and tubercles near the outer margin of the siphonal area. Most of the shell preserved. 2 . Front view of the same fossil, showing lobes, keel, and tubercles. . Accurate outline of the foliations of the septa in this species. . Lateral view of a smaller shell, collected at Darlingscott, near Shipton-on-Stour, Worcestershire, showing the sharp ribs and tubercles. Natural size. . Lateral view of a small shell from Darlingscott, showing the sharpness of the mould. Natural size. The Darlingscott specimens were collected by my friend John Kershaw, Esq., Warwick, and kindly presented to me for this work. . View of the siphonal areaof the same. The keel and ribs are more prominent in this specimen than usual on the siphonal area. Natural size. PLATE VIII. AGawan lth. Hanhart imp. PLATE IX. Zone of Arietites Bucklandi. Fig. 1. ARrEevITEs RoTIFORMIS, Sowerby. Lateral view of a fine specimen, natural size, with the shell preserved, from the Lower Lias de l’Auxois, Semur, Céte-d’Or ; kindly given me by Monsieur J. J. Collenot, of Semur, to illustrate this work. 2. Front view of the same specimen, natural size, to show the siphonal area and depth of the bisuleations, with the spine-like character of the tubercles. 3. An accurate outline of the foliations of the septa magnified. AGawan hth. Hanhart imp. 7 L I in oan 7 t - ty i : S 7 hat ti aR Y 1} nly Rid Live i ; | | PAY or } q 4 ue: wil sin ne LG nif, a ; ie yeu “ BOM KCas b me UE: ji : » iy 10 wih 1 A ee iy Biesliys Ms en pti! ea ie Cte | ett ar PO MAUR ; - "ny i ayy Pred | (Us : yy! ye oni ta beatiyy Cf ru marys ear Mt yah Ma) ¥ Aue os oO Rae rode ‘ j os } ‘ua iL! in) mere Fis) ; POYGCG) walie cae ast t\ es Ys (emery bsg, t i a ; , _ ; ig pa i ya F nL Oe ; Po epee MA PUNATLL A TRATA A t fie in ACL es oa a tsa — ue y . i ~ } es j ee a 4 a ks ‘ ; Aly . ’ “ - bee 14S 4 a J ie a! 4 t hh FA t PLATE X. Zone of Arietites Bucklands. Fig. 1. Artetites Cross, Wright. Lateral view, half the natural size, from the Scunthorpe Ironstone, North-west Lincolnshire, remarkable for the great development of the ribs near the line of involution, from the collection of the Rev. J. E. Cross, F.G.S., Appleby, Brigg, Lincolnshire. 2. Back view of the same fossil to show the narrow siphonal area, sharp narrow keel, shallow bisulcations, and trenchant ribs. Fig. 1. PLATE X A Gawan ith Hanhart imp PLATE XI. Zone of Arietites Turneri. . ArreTites Bonnarnil, d Ordigny. Lateral view, natural size, from Lyme Regis, in my collection. . Back view of the siphonai area, showing the oblique rib terminations. . Front view do. do. do. Zone of Aegoceras Jameson. . Azcocrras JamxEsoNI, Sowerby. Lateral view, natural size of a good type form of this rare species ; the specimen was collected at Hechingen, Wiirttemberg. . Back view of siphonal area of the same fossil, showing the rib arches. . Front view do. do. do. My collection. i jm a Hanhart AGawan bth iM Fig. 1. es) & o9 PAAR xe Zone of Arietites Turnert. Arimtires TurNERI, Sowerby. Lateral view, natural size, from Bredon, Worcestershire, obtained in cutting the Midland Railway. My collection. . Front view of siphonal area and line of dorsal suture. . Back view do. do. . Lateral view of one of Sowerby’s type specimens in the British Museum, figured as a good example for comparison. . Accurate outline of lateral lobes and saddles, enlarged. Do. do. of dorsal lobes and saddles, _ do. a PLATE XI A Gawan hth Hanhart imp ‘ a 5 A € . i i ‘ . + i” ’ aT ; \ < , a ‘ af ‘ 4 1 PLATE XIII. Zone of Arietites Bucklandi. Fig. 1. Ariretires Scipronianus, d@ Orbigny. Lateral view, natural size, Semur, Cote d’Or. 2. — — —- Front view of siphonal area. 3. Accurate outline of the dorsal and lateral lobes and saddles, enlarged. PLATE X11 A.Gawan hth Hanhart imp Fig. wo PLATE XIV. Zone of Aegoceras planorbis. . AEGOCERAS PLANORBIS, Sowerby. Side view, natural size, from Lower Lias Ly ) Robin Hood’s Bay. Woodwardian Museum, Cambridge. Leckenby Collection. . Front view, natural size, of the same specimen. . Lateral view of Aegoceras planorbis, from the Lower Lias of Wiirttemberg, with the - - is ; - Ba PLATE XXVI. ’ Zone of Arietites raricostatus. Fig. 1. AnGOcERAS BIFERUM, Quenstedt. Side view, natural size. My collection. 9) — — — Front view, magnified twice. 3. — — — Siphonal area do. A. — — _ Side view, showing wing-like ribs, magnified. 5. ARIETITES RARICOsTATUS, Zieten. Small shell, natural size. My collection. 6 — — — Siphonal view, magnified twice. 7 = — — Front do. do. 8. — — Side view, natural size. My collection. 5 Os, = — — Front and siphonal views of do. Ws — — — Side view, natural size. My collection. 12. — — — Do. do. showing the distance of the septa from each other. My collection. ; 13. — — — Front view of same shell. 14. — — — Siphonal area of do. . PLATE XXV Fig. o Fig. O c, Hanhart imp Mary Suft th pitas Sa avi BPP LLY rs PY ar mr ol UE 5, PLATE XXVII. Zone of Aegoceras armatum. Fig. 1. Ancocrras stuBmuTicum, Oppel. Lateral view, natural size, showing the regularity of the ribs and smallness of the tubercles ; likewise the small amount of the involution of the last whorl. My collection. 2 — — — Front view of the siphonal area, showing the tubercles in profile, the squareness of the siphonal area, and the numerous small ridges that cross the area between the larger folds. Eanhart mp Gawan hth A PLATE XXVIII. Zone of Aegoceras armatum. Fig. 1. Ancocrras armatum, Sowerby. Side view, natural size. A very fine type rt specimen. Leckenby collection. Wood- wardian Museum, Cambridge. Be — — — Front view, showing the ribs and spines in profile. 3}. — — _ Smaller specimen in same collection. 4. = — — Siphonal area, showing spines of the left side absent. — Another specimen, showing spines of the left side truncated. My collection. 6. = -— — A very accurate tracing from another specimen of the highly complicated lobe-line, showing the large size of the siphonal and principal lateral lobes. My collection. | | PLATE XXVIII AGawan lith. Hanhart imp PLATE XXIX. Zone of Aegoceras armatum. AEGOCERAS ARMATUM, Sowerby. An aged specimen, natural size, showing the large dimensions of the spines on the body-chamber and the comparative smallness of the spines on the inner whorls. ‘This specimen was obtamed at Lyme Regis thirty years ago, and was long the adorn- ment of a private collection. It now belongs to the Museum of the Royal School of Mines, and I have the pleasure of having it figured for the first time. yeas, Setioweeea ace: . NG rs % oe A.Gawan lith. Hamhart imp. T I Ae Heyii! Pea. i latieta | Day oi) i, woul oy | Ae OUT As pic ty ‘a aay nt Olt 14 4S ators | fit) ina = MY ReMA ES Huilir ldo AL tone ae WM Phe alt y lf ty i, bre iced - ’ hee Oi? pat t rue al f a ie Pah bia) WITOVA:! re = ‘ i 4 ts & Deo sehen yi to. are) otsiiey f ; = Sig. L . a MTOR Bib erieiubs Aire A ee jit! Tes side Pee { li yuh 1 ; | = PLATE XXX. Zone of Acgoceras armatum. Fig. 1. Ancoceras Lucknnpy1, Wright. Lateral view, natural size. Leckenby collec- tion, now in the Woodwardian Museum, Cambridge. 2. — — — Siphonal area, showing the ribbing and the smallness of the tubercles. = — — Front view of the same shell.: Another example in the same collection. = == — Front view, showing the lobes. = — — Siphonal area, showing the ribbing and or ow | | convexity of this area. Ce = = = Accurate tracing of a portion of the lobe- line, showing the narrowness of the siphonal lobe and the magnitude and complication of — the principal lateral lobes. Lf NG Ne TE ara ‘ Xx tawam ith Wy PLATE XXXI. Zone of Aegoceras Henley. Fig. 1. Ancoceras Davar, Sowerby. Lateral view, natural size. | Woodwardian wo Museum, Cambridge. Leckenby collection. = — Siphonal area, natural size, of the same shell. curvicornuM, Schidenbach. Siphonal area, natural size. My collection. — = Lateral view, natural size, same shell. Zone of Aegoceras Jamesoni. Tayiori, Sowerby. Lateral view, natural size. Lyme Regis. In my collection. 4 = a Siphonal area, showing the double row of tubercles on this area. — — Front view of the same shell. PLATH XXX] A.Gawan Jit ae wan Jith Harhart arp PLATE XXXII. Zone of Aegoceras Henleyt. Fig. 1. Ancocrras tatecosta, Sowerby. Lateral view, natural size, from the original 2: — BREVISPINA 31, a — 4A, — — 5. — Bircui 8. — — type specimen in the Sowerbian collec- tion. British museum. ‘This fossil is the middle-aged condition of Aegoceras Henley: before the transformation takes place (see Pl. XX XIII). Lateral view, natural size. Original type. Sowerbian collection, British Museum. Siphonal area of the same, showing the ventral row of short spines. Accurate tracing of the lobe-line. Small shell, showing details. My collec- tion. Front view, showing spines in profile. Accurate tracing of the lobe-line, showing ~ the smallness of the siphonal lobe and the magnitude of the principal lateral lobes. Young forms of this species. The series is intended to show, in connection with Pl. XXIII, that Aegoceras Birchii main- tained its original form and structure through the various phases of its life. PLATE XXXII A.Gawan lith. Hamhart imp 4 PLATE XXXIIT. Zone of Aegoceras Henleyi. Fig. 1. Ancocnras Huntuy1, Sowerby. Lateral view of a perfect specimen, showing the change of form which took place in middle-age period of this remarkable Species. 2. = — — Front view of the same shell. 3. — — _— Siphonal area of the same shell. The outer whorl of this fossil is the true Ammonites Henley, Sow., ‘ Min. Conchology,’ pl. clxxil, and the inner whorls here iw séfé in this rare specimen are clearly the Ammonites latecosta, Sow., ‘Min. Conchology,’ pl. divi, fig. 2. This specimen I obtaimed several years ago from the green Ammonite bed, near Charmouth, Dorsetshire | and since I have had three other less perfect specimens from the same stratum, all, how- ever, show the same anatomical characters which are so well displayed in the beautiful drawing Mr. Gawan has given of this Ammonite. AGawan hth ' Hanhext imp ‘ aa a i ae ae) ee | Be fh ice en Bee ee pictt i yi , . j ; ce eh Peete ame : . zi ‘ yy t ‘ PLATE XXXIV. Zone ie Aeg sere Henleyi. COWLES A Soh Tos Fig. 1. Ancocrras Beene axl Bird- Lateral view, natural size. The figures in this plate are arranged to show that Aeg. maculatum, Young = deg. capricornum, Schloth, of the Yorkshire coast, is the imma- ture condition of Aegoceras heterogenum, Young and Bird, found in the same beds. 2. — _ — Siphonal area of the same shell. 3. — — — Front view of do. do. 4. — — — Specimen in which the trans- formation scene in the last whorl has been nearly accom- plished. 5. — — = Front view of the same fossil. 6. = — — Siphonal area, showing the re- markable change in the ven- tral area both in width, tuber- cles, and ribs. the — — _ Accurate tracing of the lobe- line. 8. — — — Do. do. another specimen. All the specimens figured in this plate belong to the Leckenby collection, Wood- wardian Museum, Cambridge. PLATE XXXIV. by ce 2 ir Me By 2) 2 Hanhart imp on a Xd PLATE XXXV. Zone of Aegoceras Henleyt. Fig. 1. AzGocrRAs ACUTICOSTATUM, Wright. Lateral view, natural size. Woodwardian Museum, Cambridge. Qe — — — Front view, natural size, showing the biflexion of the ventral ribs. 3. — — — Siphonal area of the same shell. A, — HETEROGENUM, Young and Bird. Lateral view, natural size. Wood- wardian Museum Leckenby collection. . Db: — _ — Front view of the same shell. 6. — _ — _ Siphonal area of the same shell, showing the sudden enlarge- ment of the whorl at the com- mencement of the transforma- tion scene. Natural size. (hs — acuticostatuM, Wright. Lobe-line, showing simple ramifications. AGawan lth. PLATE Xxx Hamhart imp. PLATE XXXVI. Zone of Aegoceras Henleyt. Fig. 1. AzGockras HETEROGENUM, Young and Bird* Lateral view, natural size. My collection. 2. — — _ Front view of the same fossil. 3. — — — Siphonal area of the same. A. — — — Accurate tracing of the complicated lobe-line, showing the large siphonal lobe and the larger principal lateral lobes in an ex- ample of this species, collected from the Marlstone of the York- - shire coast. PLATE XXXVI A.Gawan hth. Hanhart imp. ‘ aa | PLATE XXXVI. The following species are from different zones. Fig. 1. Ancoceras Maveensstt, d’ Orbigny. Lateral view, natural size. My collection 10. Jul, from the Ibex zone. -- — Front view, showing spines do. . ARIETITES NODOTIANUS a Lateral view, natural size. This is General Portlock’s type specimen of his 4m- monites Macdonelli, Dublin Museum of the Geological Survey of Ireland. — — Front view of same, showing keel. . Aucocrras perros, Quenstedt. Lateral view, magnified. From the collection of the Rev. Samuel Lucas, F.G.S. = — Siphonal area, showing the deep ribbing. - — — Front view of the same fossil. cacatTEuM, Young and Bird. Lateral view, natural size. My col- lection. = — Front view, with ribs on ventral area of same, natural size: Miturrt, Wright. Ventral area, showing the singular shell texture of this species. Collected at Pabba by Pro- fessor A. Geikie, F.R.S. My collection. == — Lateral view of the same, showing the position of the lateral tubercles. 2A RSI CEEOL fT a a meen PLATE XXXVII Hamhart imp. a x ate eu ain Y Vai a ¥ hari i: a) ; ; ‘pee c* ih, Vig) fiend eee hap, . meth | ' Besa. = ie Liane Aerie! PLATE XXXVIII. Zone of Aegoceras Ibex. Fig. 1. Ancoceras Vaupant, d’Ordigny. Lateral view, natural size. In collection of Mr. Charles Moore, F.G.S., Bath. 2. _ — — Front view of siphonal area_ do. 3. —_ = — Body-chamber with aptychus cm siti. My collection. A. — — — Lobes and saddles of this species magnified. 5). — DENSINODUM, Qwuenstedt. Lateral view, natural size, showing the remarkable inflated mouth-border of this species from near Yeovil. My collection. 6° — — _— Siphonal area, showing its flatness and the lateral position of the short spines. PLATE XXXVI Gawan lth, Beat Hamat imp PLATE XXXIX. a Zone of Aegoceras Ibex. Fig. 1. Ancocrras Loscomst, Sowerby. Lateral view of a strongly ribbed specimen, natural size. 2. — — Siphonal area, showing prominent ribs do. — 3. — a a Another specimen of the same species. A, = Ipex, Quenstedt. Lateral view, magnified. 5. — — — Another specimen with definite ribbing. 6. — DENSINODUM, Quwenstedt. Lateral view, natural size. le — —- — Front view of the same. 8. = -— = Lateral view of another specimen, with an additional row of tubercles. a: — a Siphonal area of the same, showing ribs and spines. 1@. — — Lobe-line of this species. The siphonal shorter than the principal lateral lobe, which is split up into many divisions. All the specimens figured in this plate belong to my collection. KXXIX BR PLAT Hanhart imp. AGawan hth. = i oo Ne DAS 4i2 mnt Me ba Pog A {1 ie HAGA A ay qe PLATE XU. Zone of Aegoceras Jamesoni. Fig. 1. Azcoczras ponymMoreuuM, Quenstedt. Lateral view, magnified two diameters. In the collection of the Rev. J. E. Cross, F.G.S. 2. — _ — Siphonal area, front view do. 3. — — — Simple lobe-line of this form do. Zone of Aegoceras [bex. 4. Payiioceras Loscoms1, Sow. Lateral view, natural size. My collection. From Charmouth, Dorset. 5. — — — Front view of siphonal area do. tag. J A. Gawean lth. “y Fi le 2. 3. 4 5 A®GOCERAS PLATE XLI. Zone of Aegoceras Henley. Brcur1, Sowerby. Side view, natural size. My collection. Front view of the same specimen. Side view of a smaller shell, showing sculpture. Siphonal area of the same fossil. Lobe-line, showing the extremely ramified lobes and saddles of this Ammonite. AGawan delethth PLATE XL Hanhart lithamp I PLATE XLII. Zone of Aegoceras Henleyi. . Ancoceras striatuM, Reinecke. Side view, natural size. My collection. — — — Side view of a smaller shell, showing sculpture. — — — Front view of figure 1. — Siphonal area of figure 2. — — —_ Lobe-line, showing the extremely ramified lobes and saddles of this fossil. PLATE XLII 7 3 ikke Saleem tie eee AGawan delet lith. Hanhart lth my; “y PLATE XLIII. Zone of Aegoceras Henley. A very fine old shell of Ancocrras striatum, Reinecke. Collected upwards of thirty years ago near Lyme Regis. Was long im the possession of a local collector, but now belongs to the Museum of the Royal School of Mines, and kindly lent by Mr. Etheridge, F.R.S., for this plate. The figure is of the natural size. > a 3) las] is] a Fi o < PLATE XLIV. AmatHnus GREENOUGHI, Sowerby. One half the natural size. es a TIL ANTI) SLAIN) | A Gawan del,etlith. Hanhart Jith imp “ PLATE XLV. Zone of Amaltheus oxynotus. Fig. 1. AmautHeus Guipatianus, d’ Orbigny. | | Side view, young shell, natural size. My collection. Siphonal area of do. do. Front view of a larger fossil showing the shape of the aperture, nat. size. Side view of another example showing the lobes and saddles zz szdi. Lobe-line showing the lobes and saddles enlarged, from a tracing on the fossil. Front view of a larger specimen show- ing siphonal area, keel, and terminal cost. Side view of the same specimen showing the lateral foldings and umbilicus, natural size. ee: PLATE XLV 9 Fug.3, oO Fig.é Fig, Hanhart lthimp. AGawan. del.etlith. PLATE XLVI. Zone of Amaltheus oxynotus. Fig. 1. Amattueus Lymensis, Wright. Side view, natural size. My collection. 2. _ — -— Front view of the same fossil. 3 — —_ — Lobe-line with lobes and saddles enlarged, from a tracing of the fossil. oxynotus, Quenstedt. Side view, natural size. My collection. = — Front view, natural size, same shell. 6. — a a Lobe-line with lobes and saddles enlarged, from a tracing of the fossil. I PLATE XLVI Hanhart imp A.Gawan del. et hith \ \ = : : a ' 4 : 0 j Nae <2 on * , q ‘ , é i ; i y 4 f ’ . 7 Me 4 e hall 4 vey (al : h ‘ ; ' ; ] 4) l ’ I ; x i PORES HPL VIALE dae nye xf f : bit? ; ; ; q : “3 . ATs tt Mui : ar ee * Peatink a a e . 6 ’ a a » K : * bs mn ‘ , | a . y ‘ vas Ne PLATE XLVI. Zone of Amaltheus oxynotus. . Amattaeus Lymensts, Wright. Side view, natural size, of a fine specimen with the shell. os — _ Front view of do. do. = —~ — Lobe-line complete, highly magnified. _ Simpsont, Bean. Side view, natural size. Woodwardian Museum, Cambridge. —_ — — Lobe-line of do. do. — — __ Side view of smaller specimen, natural size. — — — Front view of do. do. PLATE XLVIL ithimp 5 i danhart AGawan delet hth. 7 pear iii5 « ae i PLATE XLVIII. Zone of Amaltheus oxynotus. Fig. 1. Amatruyus Lymensts, Wright. Side view, natural size; a highly ribbed variety. 2. Be — -- Front view of do. do. My collection. a — Witsuiret, Wright, nov. sp. <4 ae . hod a i nit er ah A * | “ee Pah at " * Ls » es P i e és SS . ' t ‘ T oi \ ' i \ ; > : * ~ * Q a ‘ PLATE L. Zone of Amaltheus oxynotus ? Fig. 1. Azcoceras Suarrert, Wright. Side view, natural size. T. J. Slatter, Hsq., Bw e 9; 10. Il. 12. 13. 14. ao & o F.G.S. its — Siphonal area, do. | All the specimensan = — Front view. (aaa ae 3, De this spécies are in his = — Siphonal area. alleen = — Do. ; = _— Young shell showing a keel, natural size. _— — Do. do. — siphonal area with keel. — — Lobe-line, magnified. Zone of Aegoceras Jameson. carusENsE, d’Orbigny. Side view, natural size. ~ My collection. — — Siphonal area. pDENSINODUM, Quenstedt. Side view, natural size. do. — se Siphonal area, do. BREVISPINA, Sowerby. Side view, do. Collection of the Rev. J. E. Cross, F.G.S. — — Siphonal area, natural size. PLATE L wan del.etlith xa AL ay mie ; AA AMO PF " so 4 SLs ane tae * ! ° Ai, Tear M MAT OB APL Ti/1 24) . ee a4 na ¥ "a Na; f ry < i r x ij 4 ae , ‘ : a fre’ Zone of Aegoceras Jameson. Fig. 1. Areocrras Jamesont, Sowerby. Oe inedaas = aes PLATE LI. Side view, natural size, large ribbed va Siphonal area, do. Collected at M and belongs to the Bristol Museum. — Side view, natural size. Hechingen. - collection. Do. do. Pabba. do. | Young shell, do. Leckhampton. Siphonal area, same shell. _ ’ ‘od, BF Hanhart imp. AGawen delet lith. PLATE LII. Zone of Aegoceras Jamesont. Fig. 1. Angoceras sacirrarium, Blake. Side view, two thirds natural size. z7. 2. — — = Siphonal area of the shell, two thirc size. Collection of the Rev. J. E. © F.G.S. % 3 = == = Lobe-line, magnified. a Ag — = Side view of small shell, natural size. AnD eee —- ===) Siphonalvareayatconaesoos PLATE LIl. A Gawan del.et lith Hanhart imp PLATE Lila. Zone of Aegoceras Jamesone. Fig. 1. Ancoceras sacitrarium, Blake. Side view, variety a, natura] size. tion. | 2. = = — Siphonal area, do. do. : 3. — — = Side view, natural size. E A. — — — Front view, do. u DE — — — Side view, do. i 6. i — — Siphonal area, do. “ PLATE LILA Fig. 6. Mary Suft del. et hth Hanhart my —— Teri PLATE LIII. Zone of Amaltheus margaritatus. * y ‘Fig. 1. Awauraeus Marcariratus, Montfort. Side view, natural size. My ¢ LI PLATE ee awan del et hth A PLATE LIV. Fig. 1. Amanrunus Marcaritatus, Vontfort. Front view, natural size. My collection. 2, — = = Back view, do. 3. — — Do. showing the imbrication of to} the keel. do. do. LATE LIV Pp Hanhart inp A Gawan del.et hth PLATE LV. Zone of Amaltheus spinatus. Fig. 1. Amauranrus spinatus, Bruguiere. Side view, natural size. My collection 9). — — = Front view, showing the keel anc My collection. wt. oe “ PLATE LY iy A.Gawan delet hth ht dete hall a oe eed A ‘ on, Y ee Gee c ats igs i AT tN Uh Ru - ae ‘ \ | | PLATE T.VI. Zone of Amaltheus spinatus. Fig. 1. Amaurazus spinatus. Back view for keel and spines, natural size. My collec- tion. 2. — — Side view, showing spines. 3. — — Front view, mouth aperture, and spines, and keel. A, — Be Lobe-line, magnified. My collection. oO. —— — Front, showing aperture and position of siphuncle. do. Zone of Amaltheus margaritatus. 6—14,19, 20. Amaurants mMarcariratus. Shells of different ages showing the evolu- tion of this species. My collection. 15. = — Type form of a young shell. do. Zone of Amaltheus oxynotus. 16. Ancocrras Lacunatum, Buckman. Side view, natural size. My collection. tie — —— — Siphonal area, showing furrow, natural size. 18. = = — Front view, do. do. a a LP A Gawan del.et lith PLATE LVI Hanhart imp PLATE LVII. Zone of Aegoceras Jamesoni. Harroceras antiquum, Wright. Side view, natural size. My. es = = Siphonal area, do. tt — — — Flexure of ribbing and keel. — — — Do. do. PLATE LVII anhart imp H x m3 ey o =) Ms) 8 wc = u} GC a PLATE LVIII. Zone of Harpoceras serpentinum. Fig. 1. Harpoceras sprpentinum, Schlotheim. 9 _ Side view, natural size. My collection. Siphonal area and keel, natural size. Lobe-line, magnified. O° . t A Gawan delet hth Boa eae il es PLATE LIX. Zone of Harpoceras bifrons. /| ; } j ACCA Fig. 1. Harpoceras Birrons, Bruguiere. Side view, lobe-line aperture and lateral processes, natural size. My collection. — Siphonal area with lobe-line do. do. — Fragment of a small shell with groove. = Do. do. do. ov bw | PLATE LIX. A Gawan del.et hth : : Hanhart amp PLATE LX. Zone of Harpoceras bifrons. Fig. 1. Harpocrras Levison1, Simpson. Side view, natural size, showing side a lobes, process, and lobe-line. M tion. 4 be | 2. _— — — Siphonal area and keel, natural size. — A .Gawan delet lith Hanhart Dip PLATE LXI. Zone of Harpoceras bifrons. Fig. 1. Harpocrras Levison1, Simp. Young condition with keel, bisulcations, and He OO prominent ribs, natural size. Bath Museum. — Side showing the lateral costz, natural size. — Lobe-line of a young costated shell. — Another fragment with Aptychus. Bath Mu- seum. — Another specimen, side view of ribbing. — Siphonal area and keel. XI , PILATE 1 imp anhart H A Gawan del.et hth PLATE LXII. : He: Zone of Harpoceras serpentinum. Fig. 1. Harpoceras nxaratum, Young and Bird. Side view, natural size. collection. 2. — — — Front view of do. do. | Bs — = — Back view of do. do. A. = LyYTHENSE, — Side view, do. collection. : ae ahs — = = Back view of same, do. 6. — = a Front view do. do. an Alt} T PLATE Fig 1 Hanhart Imp A Gawan del.et hth ab —— . PLATE LXII. Zone of Harpoceras serpentinum. tion. : — — — Front view of same, do. : = — i Back view do. do. : = = — Front view of same, dla i : a —_— — Back view do. : == a = Lobe-line, magnified. IIT. PLATE LX Fig 1 Hanhart imp AGawan delet hth, - . F * , ' 4 . - ’ ‘ . wh . F i \ i * 9 “ . ‘ * 5 ‘ . ‘ . . ‘ { “ ' ‘ - 1 ; \ . . Zone of Lytoceras Jurense. . Fie. 1. Harpocrras radians, Schlotheim. PLATE LXIV. Back view, do. Side view, natural size. tion. ; Front view, do. Lobe-line, magnified. | Another specimen, side vi Front view, Back view, PLATE LXIV AGawan delet lth. Hanhart imp iy ae. Fig. 1. Harpocnras instenz, Schudler. PLATE LXV. Zone of Lytoceras Jurense. Side view, natural size. My collection. x Front view, showing ribs and keel, natural size. : eve Back view, do. do. 0 Variety with spinous sides, do. Do., front view, do. Lobe-line, magnified, do. PLATE LXV mp anhart H A.Gawan del.ethth PLATE LXVI. Zone of Lytoceras Jurense. Fig. 1. Harpoceras instenu, Schubler. Side view, reduced half nat = = — Front view of this variety, « Be — — — Back view, do. This shell is contained in the Geneva Museum, and was collected in tk Toarcien of Thouars, Deux-Sévres, France. cf f A wan. delet lith a AG PLATE LXVIL. Zone of Lytoceras Jurense. salt te! yy eee Fig. 1. Hareoceras varrasrie, d’ Orbigny. Side view, natural size. M. 60 2 — — — Front view, showing siphun —6, — — — Different forms of varieties of tl SS SS eee Se —— ete, awan delet lith > Ga A PLATE LXVIII. Zone of Lytoceras Jurense. Sal Fig. 1. Harpocrras vaRtIABILE, d’Orbigny. Grand specimen, natural size. My collection. Fig. ep ecg POOLE A Gawan delet lth - & PLATE LXIX. Zone of Aegoceras Henleyi. Fig. 1. Lyroceras tinzatum. Side, natural size. My collection. Zone of Aegoceras Lbex. 2. Arcoceras Vaupant, d’Orbigny. Side view, natural size. My collection. Be — = — Back view, do. 4 — — — Lobe-line, magnified. Zone of Aegoceras Jamesont. Bs — PETTOS, Quenstedt. Side view, natural size. My collection. = Siphonal area and lobe-line, do. PLATE LXI t Hanhart imp. eae A Gawan.del.et lith PLATE LXX. Zone of Amaltheus margaritatus. Fig. 1. Amauttaeus EnGELHarDtt, d’ Orbigny. Side view, natural size. My collection. it PLATE LXX# A Gawan del ethth, hy Fig. 1. Lyroceras PLATE LXXI. . Zone of Amaltheus margaritatus. FIMBRIATUM, Sowerby. Side view, natural size. My c Hanhart.imp. E A Gawandel,cblith ) PLATE LXXII. Zone of Amaltheus margaritatus. Fig. 1. Lyroceras rimpriatum, Sowerby. Lateral view, natural size, showing radii and fimbriz. My collection. Front view showing aperture. Abdominal view, siphonal area, radii and fimbriz natural size. Accurate delineation of the complicated suture line, magnified. A.Gawan.del et ith Hanhart amp / 1g /. : ‘ i ¢ PLATE LXXIII. Zone of Harpoceras bifrons. Fig. 1. Lyrocuras cornucopia, Young. Side view, one half natural size. Geneva Museum. 2. — — — Front view showing siphonal area and aperture. 3. — — — Suture line showing extreme complication, magnified, Fug. / PLATE A. Gawan.del ett Hanhart.amp PLATE LXXIV. Zone of Lytoceras Jurense. Fig. 1. Harpoceras rapians, Reinecke. 2. — -— — Side view, natural size. My collection. Front view, showing carina, siphonal area, and aperture. 3. Lyroceras JurRENSE, Zeten. Side view, natural size. My collection. A. —_ — — Front view of same. 5. —_ — —_— Abdominal view of same. PLATE. .LXX1V A Gawan .del eb lith PLATE LXXV. Zone of Lytoceras Jurense. Fig. 1. Harpocnras insienn, Se/ibler. Abnormal young form, side view, natural size. My collection. 2. — — — Front view of same fossil. oF — — — Abdominal view of do. 4. Lyrocrras arrcinum, Schlotheim. Side view, natural size. School of Mines Museum. 5. oo — os Abdominal view of same. dao. 6 = — — Lateral view of another specimen, natural size. My collection. ie — — — do. variety do. do. 8. Harpoceras AaLENSE, Zieten. Lateral view, showing entire side processes to the aperture. Prof. Waagen’s collection. 9. —- — — Side view with prominent folds, natural size. My collection. * 10. —_ — — do. do. Shell and position of suture line, natural size. PRIVAT Ee a XCy. b imp r Hanha: A.Gawan del.eb ith PLATE LXXVI. Fig. 1. Payiioceras Buvieniert, @ Orbigny. Side view, natural size. Belfast Museum. 2. a = — Siphonal area, natural size. 3. ee —_ — Suture-line magnified. 4. Lyroceras roruLosum, Sehibler. Fragment, natural size. My collection. 5. a — — Siphonal area showing shell and striae. do. do. 6. — _ wircinum, Schlotheim. Showing strize and fimbriz, natural size. My collection. Ha A_Gawan del ef lith os oF PLATE LXXVII. Fig. 1. Payuioceras Zerss, a Orbigny. Side view, natural size. My collection. 2. — _ — Front view, siphonal area and aperture. 3. — _ — Suture-line, magnified. 4, — HETEROPHYLLUM, Sowerby. Suture-le magnified to compare — with that of Phylloceras Zetes. KXVIT / PLATE .L . . PLATE LXXVIII. Zone of Stephanoceras commune. Fig. 1. PaynLocnras HETEROPHYLLUM, Sowerby. Side view, half natural size, showing the fan-like dwelling-chamber. 2. _ — — Suture lime magnified. British Museum. The figured specimen was collected from the Upper Lias shales of Whitby. Hanhart imp A Gawan del.et hth . PS se ea _ PLATE LXXIX. Zone of Lytoceras Jurense. Lytocrras Jurmnse, Zetex. Side view. ‘This magnificent specimen, figured two thirds natural size, was presented to the Museum of the Royal School of Mines by the Earl of Ennis- killen, D.C.L., F.R.S. The Ammonite had been sawn through to exhibit a vertical section of the septee and chambers. There is no record of the locality from whence the fossil came, but from the petrological character of the rock 1 believe it was derived from the hard beds, Upper Lias, Dorsetshire. A-Gawan. del.et lith eye ee PLATE LXXX. We Zone of Harpoceras opalinum. Fig. 1. Harpoceras AaLense, Zetfen. Side view, natural size, with shell. Adult form, Coaley Wood. My collection. —_ _— — Front view of the same do. do. — — Suture line of do. magnified. a OpALINUM, einecke. Side view, natural size. Frocester Hill. My collection. = — — Suture line of do. magnified. 6. _— — — Large specimen, natural size. My collec- tion from Haresfield. — — — Front view of the same, natural size. 8. — = —_— View of siphonal area. eww | ~ PLATE LXXX A Gawan del. et hth Hanhart imp PLATE LXXXI. Zone of Stephanoceras commune. Fig. 1. Paytuoceras suscartnatum, Young and Bird. Side view. Natural size, with shell preserved. Whitby. My collection. = Front view of the same do. — Siphonal area, with sulci and carina. Side view, natural size. Upper Lias shale, Hast Brent Knoll, Somerset. My collec- tion. ; Siphonal area and carina. Front view with carina and ribbing. LATE LXXxXI1 P Fig 4 A Gawan del.et lith Fig. PLATE LXXXITI. Zone of Lytoceras Jurense. 1. Harpoceras AALENSE, Zeten. Side view, natural size. Lyt. Jurense Bed, Wasserelfingen, Germany. My collection. OF — — — Front view, do. do. do. 3. = = — Side of another specimen do. do. 4. — — — Siphonal area, do. do. do. 5. — costuLaA, — Side view, natural size. Variety with coarse ribs, from my collection. Wasserelfingen. 6. — — — Variety with fine ribs, from my collection. Frocester Hill. di _— acutuM, Zate. Side view, magnified two diameters. Chipping Warden, Northamptonshire. My collection. 8. —_— —_ — Front view, do. do. — BICARINATUM, Minster. Side view, natural size. Coaley. Col- lection of Museum, School of Mines. 10. — — — Front view, do. do. 10a — —_ — Suture line, magnified. Wis — — — Front view of a specimen copied from d’Orbigny, ‘Pal. Franc. Jurass.,’ pl. 114, fig. 3. 12. — DISCOIDES, Zeten. Side view, natural size. Coaley. My col- lection. la — — — Suture line, highly magnified. 13. — — — Front view, natural size. My collection. 14. AMALTHEUS LENTICULARIS, Young. Side view, natural size. Whitby. Col- lection of Museum, Royal School of Mines. 15. — — — Front view, do. do. Hanhart imp. AGawan delet hth Cor 1 , oi 2 7 a vA asi 7 aw ‘ uf | a f ij , 4 y ‘ i u "a * ; } ; , ‘ Me : - 2 ‘ i \ i “” ‘ * : ' i PLATE LXXXIII. Fig. 1. Harpoceras Normanianum, d’ Orbigny. Side view. British Museum. 2. — — — Front view. 3. STEPHANOCERAS COMMUNE, Sowerby. Side view. British Museum. 4. — == os Front view. PLATE. LXXXI] A Gawan lith Fig. 1. SrePHANOCERAS COMMUNE, Sowerby. 2. 3. 4. HaRpocrRAs STRIATULUM, PLATE LXXXIV. . STEPHANOCERAS ANNULATUM, — Side view, natural size. My collection. Front view of the same shell. Suture line highly magnified. Side view, natural size. My collection. Collected by myself from the “ Lytoceras Jurense zone,’ Peak. Side view, natural size. My collection. Collected from the “ Lytoceras Jurense zone” at Frocester Hill. Siphonal area, showing keel and coste. My collection. 3 Side view, natural size. My collection. Front view of same shell, with oral aperture. Portion of the suture line magnified. PLATE Fig. 2 A Gawan, del et lith PLATE LXXXV. Zone of Stephanoceras commune. Fig. 1. Sonn ANOPERAS suBaRMaTUM, Young. Side view of a variety from Whitby, exhibiting the close relationship existing between this species and some varieties of Stephanoceras fibu- latum. Natural size. My collection. Side view, natural size, from Upper Lias of Chipping Warden, Nerth- amptonshire, showing the spinous inner whorls, and the smooth, bifur- we | | | cate costz of the outer whorl. 3. — — — Siphonal area of same shell, displaymg its breadth and costation. 4. = = — Suture magnified. 5. STEPHANOCERAS FIBULATUM, Sowerby. Large inornate shell, side view, showing the oral aperture. My collection. 6. — — — Siphonal area and apertural expansion of same specimen. ite — — — Side view of another example, showing very well the “button and loop ” style of costation so characteristic of the species. 8. = — = Side view of the variety termed Andree. 9. — = = Portion of side of a rotund variety whose costee are sharp, and possess pointed spines unfibulated. 10. — = _ Siphonal area of a specimen collected from the Upper Lias of the Dowdes- well Tunnel, showing tubercles and transverse coste. ILM. — = = Side view of a specimen from same bed and locality. The fossil is identical with Am. Bollensis of Quenstedt. = ea = 6 | ae; A Gawan. del et hth. PLATE LXXXVI. Zone of Stephanoceras commune. Fig. 1. STuPHANOCKRAS CRASSUM, Young. Side view, natural size. Whitby. My col- 10. lection. — — Front view siphonal area and oral aperture. Braunranum, @ Orbigny. View of siphonal area magnified two and a half diameters. My collection. — — Side view of same shell, showing tubercles and costation magnified two and a half diameters. RaQuINIANUM, — Siphonal area magnified two dia- meters, with suture line in siti. Nailsworth. Upper Lias Sands. My collection. — — Side view of the same fossil, showing the position of the tubercles and lateral costze ; two diameters. = = Front view of the same, showing regular transverse coste. crassuM, Young. Large, well-developed specimen showmg siphonal area, thick transverse cost, and lateral tubercles im siti. Whitby. My collection. = _ Lateral view of the same fossil, showing the strong coste and thick whorls. — — Front view of the same shell, showing transverse cost and oral aperture. A.Gawan del et lith. PLATE LXXXVI Mintern Bros. imp Fig. PLATE LXXXVII. Zone of Stephanoceras commune. 1. SrepHanoceras Raquinianum, d’ Orhigny. Natural size, showing the siphonal 10. area and transverse costee. ‘Stinch- combe. Upper Lias Clay. My collection. — — Side of the same fossil, natural size. = aa Front view, showing transverse cos- tation and oral aperture. a= — Wide siphonal area, natural size. Stinchcombe. Upper Lias Clay. My collection. BRavuNIANUM, = Side view, natural size. Stinch- combe. My collection. — — Siphonal area of the same shell. RaQuINIANUM, — Side view, natural size, with fine coste and small tubercles. Stinchcombe. My collection. — — Siphonal area of the same fossil. communk, Sowerby. Shell preserved, natural size, from Upper Lias, Chipping Warden, Northampton- shire, where it is known as Am. Holandrei, VOrbigny. — — Side view, natural size, of the same fine specimen in the collection of Mr. Kdwin A. Walford, F.G.S., Banbury, who kindly communicated it for figuring in this work. LXXXVIIL. PLATE fig. 3 Fig. 10. Fig. 8. / Fig. 7 Mintern Bros imp A.Gawan dei.et hth. PLATE LXXXVIII. Fig. 1. Aprycxus. From the Inferior Oolite of Leckhampton Hill, of unusual size. Probably belonging to Cosmoceras Parkinsoni. My collection. 2. Anaptycuus, Belonging to Arietites stellaris. Lower Lias of Charmouth. My collection. 3. — Perhaps belonging to Arietites Conybeart. Locality unknown. British Museum. A. = Locality unknown. British Museum. PLATE LXXXVIII A.Gawan lith i yY wea’ Bell fiel —+ mali\Aarna _ AAS AA pAAa a f. - & Ta) RA aa Anr \~ eet a ca, nf en = Ae a” aA, ‘at AS 2a a assenananane aanAr AA AAAS: 3 < a Ala vy yf Pais NF ~~ ry & rc ‘ a a _-P ./ Mh ¢ Wa “s —ncatceenl ~ AAP a AERA 2 AE eegh? aa a Ana aman MF iar Are =n SP ea pS ee ~~ ie pk aay nak aaieoc.- \ Bee ca mae eee eane Bn- PAR oe we =~ 4 5 on an BeAr AARNE AAAS GINA WET AAR! RARER 8 AAR a nmAPAARaremmanmAA As 2 ma ~ A get anole aaaauaaanaaeaaeaet we ant an A28 ry AAR RRA AAAR, a lelenteleln len |_| ! 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