CRETACEOUS PERIOD. 



485 



(e.) Cephalopods. — Tetrabranchs (or Tentaculifers) of the Ammonite and Nau- 

 tilus families. — Fig. 786, Crioceras Duvalii, from the Lower Cretaceous. Fig. 787, 



Figs. 786-790. 



Cephalopods, Ammonite Family. — Fig. 786, Crioceras Duvalii; 787, Ancyloceras Matheroui- 

 anus; 788, Hamites attemiatus ; 789, Toxoceras bituberculatus ; 790, Turrilites catenatus. 



Ancyloceras MatTieronianus, Lower Cretaceous. Fig. 788, Hamites attenuatns, 

 Middle Cretaceous. Fig. 789, Toxoceras bituberculatus. Fig. 790, Turrilites 

 catenatus, Gray Chalk. Also Baculites (as B. anceps, etc.). — Dibranehs (Aceta- 

 bulifers) : Belemnitella mucronata, a common species of the Upper Cretaceous; 

 also species of Belemnites and Conoteuthis. 



4. Articulates. — Worms of several genera. Crustaceans, of the Brachy- 

 ural genera, Grapsus, Podophthalmus, Podopilumnus, Areania, Notopocorystes. 

 etc. ; and the Macroural, Scyllarus, Callianassa, Palosastactis, etc. Of the tribe 

 of Cirripeds, Tubicinella, Pollicipes. Also Ostracoids. 



5. Vertebrates. — (o.) Teliost Fishes.— Fig. 791, Osmeroides Lewesiensis, from 

 the Chalk at Lewes,— a fish of the Salmon family (Cycloid) related to the Smelt 

 (genus Osmerus), and about fourteen inches in length. Another species of the 

 genus, from the same beds, 0. Mantelli, is eight or nine inches long. There were 

 other Cycloids, of the genus Clupea (Herring), etc. Several species of Beryx, 

 a genus related to the Perch (Ctenoid), occur in the Chalk : one, B. Lewesiensis, 



