240 MOLLUSCA. CEPHALOPODA. Conulahia, 
Gen. BELEMNITA. — Apex solid, having a conical cavity 
towards the base occupied by a shell divided transversely in- 
to chambers, with a syphon. 
1. li. fusifm’mis — A receptacle for the alveolus exists towards the base in 
the form of a cone, from the point of which the body of the fossil again swells, 
and continues of a compressed roundish shape, with a longitudinal sulcus for 
an inch or two, when it terminates wdth a tapering point — Parkinson’s Or- 
ganic Remains, iii. 127* t. viii. f. 13. — In Lower Oolite^ Stonesfield, Oxford. 
2. B. Subfusiform, cylindrical, with one longitudinal sulcus, apex 
pointed. Siphunculus central, extending through the alveolus to the apex 
of the spathose part. — B. min. List. An. Ang. 227, f* 32. B. List. Mant. 
Fossils, 88, t. xix. f. 17, 18. 23. — In Chalk-Marl. 
3. B. coniformis — Conical or produced, pointed, with one or more longitu- 
dinal grooves. — Park. Or. Rem. iii. 127. t. viii. £ 15. — In Lias. 
4. B. Allani — Nearly cylindrical, the apex conical, with a slender produced 
point. Alveolus conical, pointed, the point sublateral — Belemnite, Allan, 
Edin. Trans, ix. p. 407* t. xxv. Mant. Fossils, 201, t. xvi. £ 1. — In Chalk. 
Many species, not yet determined, occur in the chalk lias, and interme- 
diate beds. 
Gen. CONUL aria. — C onical, hollow, divided into chambers 
by partitions destitute of a syphon ; mouth half closed. 
1. C. qiiadrisulcata — Four-sided, straiglit, transversely sulcated, and longi- 
tudinally striated ; the four angles sulcated. In the centre of each side, the 
sulci are bent, the spaces between these form very narrow ridges, and the 
longitudinal striae are most conspicuous ^vithin the hollows. Two of the op- 
posite are longer than the others. A curious fossil — lire's Ruth. 330. t. xx. £ 7- 
— Con. quad. Sower. Min. Con. t. ccxl. £ 3, 4, 5, Q.-.— Carboniferous Limestone. 
2. C. teres Conical, round, slightly bent, transversely striated, a smooth 
space near the apex ; striae irregular, as well as the curvature ; the general 
form approaches towards cylindrical, but the smooth part near the apex is 
more conical. — Sower. Min. Conch, t. cclx. £ 12. — In Carboniferous limestone. 
Gen. AMMONITA. — Sides equal, whorls contiguous and ap- 
parent. 
^ Surface of the whorls smooth. 
1. A. Henslowi. — ^Discoid, sides flat, front rounded ; whorls 4, exposed ; par- 
titions with three entire tongue-shaped lobes on each side ; aperture bbovate. 
Sower. Min. Conch, t. cclxii. — In Transition Limeston ? Scarlet, Isle of Man. 
Surface striated or ribbed. 
2. A. acuta. — Depressed, Avhorls 3 or 4, the inner ones half exposed ; sur- 
face with straight projecting radii on the inner half of each whorl ; the mar- 
gin slightly carinated, and crenated ; aperture triangularly cordate — Sower. 
Min. Conch, t. xvii. £ 1.— -In the London Clay at Munster Cliff. 
3. A. corcfato,— Depressed, whorls 4 or 5, the inner ones half exposed ; sur- 
face with angular, projecting, undulating radii, extending over the inner 
half of each whoi’l, the remaining half covered by diverging undulations, end- 
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