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 

 fissui-e of the guard, and an apical nucleus. 



AcANTHOTEUTHis (Wagner), Miinster. 



Etym., acantJia, a spine, and teuthis. 



St/n., Kelseno (Munster.) Belemnoteuthis ? 



Tz/jje, A. prisca, Ruppell. 



Foimded on the fossil hooks of a calamary, preserved in the Oxford claj- 

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

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

 pen like that of the ommastrepkes has been hypothetically ascribed to these 

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

 teuthis. 



Belemnoteuthis (Miller), Pearce, 1842. 



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



Shell consisting of di phragmocone, Kke 

 that of the belemnite ; a horuy dorsal pen 

 with obscm-e lateral bauds; and a thin 

 fibrous guard, ^Yith two diverging ridges on 

 the dorsal side. 



Animal provided with aryns and tenta- 

 cles of nearly equal length, fm:nished with 

 a double alternating series of horny hooks, 

 from 20 to 40 pairs on each arm ; mantle 

 free aU round; fins large, medio-dorsal 

 (much larger than in fig. 33). 



Fossil in the Oxford clay of Chippen- 

 ham. Similar horny claws have been fomid 

 in the Has of Watchett; and ?i guard equally 

 thin is figured in Buckland's Bridgewater 

 Treatise, t. 44, fig. 14. 



In the fossil calamaiy of Chippenham, 

 the sheU is preserved along with the mus- 

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

 and tentacles with their horny hooks ; aU 

 the specimens were discovered, and deve- 

 loped ^\ith unexampled skiU, by WiUiam 



Buy, of Sutton, near Chipi)enham. 



Fig. S3. Belemnoteuthis* 



* Fig. 33. Belemnoteuthis antiquus, I, 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 sep- 

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



E 2 



