CLASS V 



CEPHALOPODA 



667 



Eurynoticeras Canavari. 



Jura. Desmoceras Zittel (Figs. 1296, 1297); Puzosia 

 Bayle ; Gleonoceras Paroiii and 

 Bon. ; Schlueteria, Hauericeras 

 Grossouvre. Cretaceous. 



Subfamüy B. Silesitinae 

 Hyatt. 



Similar to the Desmoceratinae, 

 but costae more strongly de- 

 veloped, and sometimes spinous. 



Fio. 1297. 



Desmoceras inayorianum (d'Orb.). Gault ; Perte du Rhone 

 (after d'Orbigiiy). 



Fio. 15 

 Fachydiscus feramplus (Mantell). Lower Chalk ; England. 



Fig. 1299. 



Pcichydiscus wittekindi (Schlüter). 

 Upper Cretaceous ; Haldem, West- 

 phalia. 1/3. 



Süesites, Holcodiscus Uhlig ; Fachydiscus Zittel (Figs. 1298, 1299); Parapachy- 

 discus Hyatt. Type P. {Ammonites) gollevülensis (d'Orb.). Cretaceous. 



Family 28. Oosmoceratidae Zittel. 



Shells richly ornamented with ribs that are divided, or broken wp into rows of hnots. 

 Usually with rows of umbilical and marginal hnots on the ribs. Sculpture interrupted 

 by a furrow on the venter. Aperture often with lateral ears or lappets. ? Septa deeply 

 digitate. One or two auxiliary lobes present. 



