Ammonita. MOLLUSCA. CEPHALOPODA. 
Ml 
83. A. fihulata. — Depressed, ribbed ; inner whorls almost wholly exposed, 
sides of the whorls flattened, their inner margins plain ; ribs numerous, unit- 
ed ill pairs by smooth solid spines. — Sower. Min. Conch, t. ccccvi. f. 2 — In 
Lias at Whitby. 
84. A. catena — Depressed, furnished with two rows of short tubercles up- 
on each side ; whorls 6 or 8, smooth, with flat sides, the inner ones exposed ; 
front rather convex; aperture square. — Sower. Min. Conch, t. ccccxx. — 
Middle Ooliie., near Abingdon, Berkshire. 
85. A. cristata — Lenticular flattened ; carinated ; keel thin, deeply, notch- 
ed ; inner whorls concealed. — Sower. Min. Conch, t. ccccxxi. f. 3 — -Middle 
Oolite., Weymouth. 
86. A. Johnstoni. — Discoid ; whorls 6 or 8, two-thirds exposed, with nu- 
merous short straight costae upon the exposed parts ; front plain.— ^S'owcr. 
Min. Conch, t. ccccxlix. f. i. — In Lias at Watchet. 
87. A. varicosa. — Depressed, costated ; inner volutions exposed ; carinated 
when young, and furnished with an irregular row of tubercles upon the in- 
ner edges of the whorls ; costae curved, large, obtuse, in old shells crossing 
the front ; carina distinct ; aperture oblong. — Sower. Min. Conch, t. ccccli. f. 
4, 5. — Sandstone, Blackdown. 
88. A. ro^i/ormis.— Depressed, ribbed, carinated, a furrow upon each side of 
the keel ; inner whorls exposed, many ; ribs many, strong, each terminating 
in a tubercle ; aperture nearly square — Sower. Min. Conch, t, ccccliii. 
89. A. multicostata. — Depressed, costated, carinated, a furrow on each side of 
the keel ; inner whorls exposed, few ; ribs strong, sharp, numerous, with a 
tubercle near the end o^each ; aperture oblong,— Min. Conch, t. ccccliv, 
— In Lias, near Bath. 
90. A. Discoid, thick, radiated; inner whorls exposed; front 
rounded ; radii large, numerous, rising into a tubercle on each side the whorl, 
where they branch into three ; aperture arched, oblong. Sower. Min. Conch, 
t. D. f. I — Inferior Oolite, Sherborne. 
91. A. contracfa. — Subglobose, umbilicated, radiated ; radii rising into tuber- 
cles upon the border of the umbilicus, there dividing into three or four branches 
that pass over the much rounded front ; aperture ol)long, arched ; inner whorls 
almost concealed. — Sower. Min. Conch, d. f. 2. Diindry. 
92. A. Listeri. — Subdiscoid ; inner whorls partly concealed ; front convex, 
broad, crossed by numerous small ri!)s ; sides inversely conical, ribbed ; ribs 
terminated by tubercles.— Mart. Pet. Derb. t. xxxv. f. 3. — Sower. Min. Conch. 
Di. f. 1.— Carboniferous Limestone. 
93. A. longispina. — Discoid, thick, v/ith two concentric rows of spines upon 
each side ; whorls few, half exposed ; front round. — Sower. Min. Conch, t. m. 
f. 2 — Weymouth. 
Qi. A. Taylori. — Discoid, radiated ; inner whorl exposed; radii about 12, 'with 
one large sj)iniform tubercle upon each side of the front, and one or two slight 
elevations on the rounded sides of the whorls ; aperture nearly round — Sower. 
Min. Conch, t. D. xiv. f. l.~In clay, Happisburg Cliff. 
95. A. hippocastanum — Gibbose, umbilicated, radiated, spinose ; inner whorls 
almost concealed ; radii ten or more, unequal, much elevated, each furnished 
with three tubercles upon the front, and most of them with two obtuse spines 
upon each side ; aperture transversely OYdXQ.—Sower. Min. Conch, t. Dxiv. 
f, 2— In chalk, Dowiands. 
