Ammonita. MOLLUSCA. CEPHALOPODA. 243 



31. A. Herveyi — Gibbose, the inner whorl two-thirds concealed ; ribs nu- 

 merous, sharp, bi- or tri- furcated ; aperture lunate, with obtuse angles. 



Sower. Min. Conch, t. cxcv — Under Oolite, near Spalden. 



32. A. Brocchii — Compressed, sides hollow ; whorls 3 or 4, half concealed, 



very round, front circular, with many obtuse ridges ; aperture lunate Sower. 



Min. Conch, t. ccii Under Oolite. 



33. A. annulata — Depressed, whorls 5 to 7, exposed, rounded ; ribs nu- 

 merous, prominent, divided on the front ; aperture roundish Sower. Min. 



Conch, t. ccxxii — In Lias. 



34. A. Lamberti — Depressed, inner whorls partly concealed, front sharp 

 and crenated ; ribs strong, obtuse, bent over the front, alternately long and 

 short, rarely furcate; aperture lanceolate, short — Sower. Min. Conch, t. ccxlii. 

 f. 1, 2, 3 — Upper Oolite, Weymouth. 



35. A. Leachii — Depressed ; inner whorls half concealed ; front sharp and 

 crenated; ribs undulated, curved over the front, often furcate; aperture 

 ovate ; like the preceding, but more gibbous, with fewer and more promi- 

 nent ribs — Sower. Min. Conch, t. cclxii. f. 4 Upper Oolite, Weymouth. 



36. A. omphaloides.— Gibbose, whorls increasing rapidly, inner ones half 

 concealed, front rounded, broad ; ribs prominent, waved, bent forward in the 



middle of the front, generally furcated ; aperture transversely oblong Soiver. 



Min. Conch, t. ccxlii. f. 5 Upper Oolite, Weymouth. 



37- A. Strangewaysi — Discoid ; whorls 5, exposed, margin flattened, cari- 

 nated ; inner edges of the whorls obliquely flattened ; sides nearly flat, wich 



an obscure concentric furrow ; ribs twice furrowed ; aperture oblong Sower. 



Min. Conch, t. ccliv. f. 1, 2, 3 — Under Oolite, Ilminster. 



38. A. falcifer. — Discoid ; inner whorls half exposed, margin convex, cari. 

 nated ; inner edge of the turns elevated and obtuse ; ribs numerous, curved, 

 and suddenly bent in the middle ; aperture elliptical — Sower. Min. Conch, 

 t. ccliv. f. 2 — Under Oolite, Ilminster. 



39. A. Goodhalli — Discoid, carinated ; both edges of the whorls gradually 

 rounded ; sides nearly flat ; inner whorls two-thirds exposed ; ribs large, un- 

 dulated, irregular, obscurely tuberculated at each end ; keel very prominent, 

 thin ; aperture oblong — Sower. Min. Conch, t. cclv In Green Sand, Black- 

 down, Devonshire. 



40. A. Karnigi — Discoid, convex, margin rounded, whorls 6, half exposed, 

 marginal undulations numerous ; central undulations few, very prominent ; 



aperture cordate, elongated — Sower. Min. Conch, t. cclxiii. f. 1, 2,3 Middle 



Oolite, Kelloway. 



41. A. triplicata — Discoid, whorls 5, exposed, with two or three oblique 

 contractions ; ribs straight, large, each divided into three as it passes over 

 the rounded front ; aperture suborbicular — Sower. Min. Conch, t. ccxcii. 

 ccxciii. f. 4 — Middle Oolite. 



42. A. biplex — Discoid, whorls 5, exposed, ribs numerous, small, obtuse, 

 split over the rounded front; aperture oblong.— Sower. Min. Conch, t. ccxciii. 

 f. 1, 2 — In Clay, but the formation unknown. 



43. A. rotunda — Discoid, ribs thick, numerous, split over the front, sides 

 subventricose ; aperture orbicular — Sower. Min. Conch, t. ccxciii. f. 3.— 

 Upper Oolite. 



44. A. decipiens — Discoid, depressed, whorls 5, exposed, rounded on the 

 front, ribs large and few on the sides, numerous and small on the front ; aper- 

 ture orbicular.._5owcr. Min. Conch, t. ccxciv.— In Clay, but the formation 

 unknown. 



<*2 



