EXPLANATION OF PLATES. 333 



Fam. Ammonacea- 



477. Ammonoceras, (from Blainville.) 



478. Ammonites ; a, break in the shell, showing the sinuous 



septa. 



479. Orbulites crassus. Globulites, Nonnul. Angulites, Montf. 



reduced. 

 479*. • discus. Aganides, Montf. 



480. Groniatites striatus. 



481. Scaphites sequalis. 



482. Crioceratites Duvallii. 



483. Turrilites tuberculatus. 



484. Baculites Faujasii. Portion near the centre. . 



484*. Hamites cylindricus ; a, internal cast of part of the shell ; 

 b, hollow external cast of the remainder. 



Second Division. Monothalamous Cephalopoda. 



485. Argonauta Argo. 



486. BeRerophon tenuifasciata, (from Sow. den.) 



487. The same, shewing the dorsal keel. 



Order. Heteeopoda. 



488. Carinaria Mediterranea. 



