CEPHALOPODA. 



75 



phragmocone is never preserved, but casts of the alveolus show that it was 

 chambered, that it had a single dorsal ridge, a ventral process passing into the 

 fissure of the guard, and an apical nucleus. 



ACANTHOTEUTHIS (Wagner), Munster. 



Etym., acantha, a spine, and teuthis. 



Syn., Keleeno (Munster.) Belemnoteuthis? 



Type, A. prisca, Ruppell. 



Founded on the fossil hooks of a calamary, preserved in the Oxford clay 

 of Solenhofen. These show that the animal had 10, nearly equal arms, all 

 furnished with a double series of horny claws, throughout their length. A 

 pen like that of the ommastrephes has been hypothetical^ ascribed to these 

 arms, which may, however, have belonged to the belemnite or the belemno- 

 teathis. 



BELEMNOTEUTHIS (Miller), Pearce, 1842. 



Type, B. antiquus (Ounuington), fig. 33. 



Shell consisting of a phragmocone, like 

 that of the belemnite ; a horny dorsal pen 

 with obscure lateral bands ; and a thin 

 fibrous guard, with two diverging ridges on 

 the dorsal side. 



Animal provided with arms and tenta- 

 cles of nearly equal length, furnished with 

 a double alternating series of horny hooks, 

 from. 20 to 40 pairs on each arm ; mantle 

 free all round ; fins large, medio- dorsal 

 (much larger than in fig. 33). 



Fossil in the Oxford clay of Chippen- 

 ham. Similar horny claws have been found 

 in the lias of Watchett; and a guard equally 

 thin is figured in Buckland's Bridgewater 

 Treatise, t. 44, fig. 14. 



In the fossil calamary of Chippenham, 

 the shell is preserved along with the mus- 

 cular mantle, fins, ink-bag, 'funnel, eyes, 

 and tentacles with their horny hooks ; all 

 the specimens were discovered, and deve- 

 loped with, unexampled skill, by William 



Buy, of Sutton, near Chippenham. 



Fig. 33. BelKmnoteuthis* 



* Fig. 33. Belemnoteuthis antiquus, , ventral side, from a specimen in the cabinet 

 of William Cunnington, Esq., of Devizes. .The last chamber of 'the phragmocone is 

 preserved in this specimen, a, represents the dorsal side of an uncompressed phrag- 

 mocone from the Kelloway rock, in the cabinet of J. G. Lowe, Esq. ; c, is an ideal sec- 

 tion of the same. Since this woodcut was executed, a more complete specimen has 



