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PALAEONTOLOGY 



like the phragmocone of the Belemnite (fig. 22, i), has an outer 

 sheath of fibrous structure, one-fourth of an inch thick at the 



Fig. 22. 

 i. Belemnites Oweni ; Oxford Clay, Chippenham, p. Phragmocone 

 exposed by the removal of the fibrous guard from one side ; s, septum, 

 showing the marginal sipliuncle. 



2. Acanthoteuthis antiquus (Cunnington) Oxford Clay, Chippenham ; 

 dorsal aspect. 



3. Conoteuthis Dupinii ; Gault, Folkestone. 



4. Geoteuthis. 



5. Sepia. 



6. Coccoteuthis. 



7. Spirulirostra. 



8. Beloptera anomala. 



apex, and furnished with two converging ridges on its dorsal 

 side ; the external surface, however, is horny (or chitinous), 

 like the pen of the Calamary. These chambered shells occur 

 in great numbers, and are so like the phragmocones of the 

 associated Belemnites, both in structure and proportions, that 

 they were originally described by me as such,* and I still view 

 them as evidences of the close affinity of the cephalopod 

 possessing them to the true Belemnite : hitherto they have 

 only been noticed in the laminated Oxford clay of Wilts, and 

 the equivalent lithographic shales of Solenhofen. 



* Philosophical Transactions, 1844; and Cat. Fossil Invert., Mus. Coll. of 

 Surgeons. 4to, p. 5. 



