PLATE LXXIX. 



Page 

 Talaeocbinus subglobosus W. and Sp 789 



Fig. la. Posterior view of the calyx. (Coll. W. and Sp.) 

 lb. Ventral aspect of the same specimen. 



Pteeotoceinus depeessus Lyon and Cass 796 



2a. Lateral view of the type specimen. (Coll. S. S. Lyon.) 



2b. Lateral view of the calyx, showing two of the wings. (Coll. W. and Sp.) 



2c. Dorsal aspect of the calyx. (Same collection.) 



2d. Another type specimen, showing the wings in position. (Coll. S. S. Lyon.) 



2e. A wing, showing the face of attachment. 



Pteeotoceinus acutus Wetherby 799 



3a. Posterior view of the calyx. (Coll. W. and Sp.) 



3b. Anterior view of the same specimen. 



3c. Ventral aspect of a specimen with two of the wings preserved, and the anus 



covered by a Gasteropod. (Same collection.) 

 3d. Another specimen, showing the wings in a side view. (Same collection.) 

 3e. Dorsal aspect of a fine specimen with arms and wings. (Same collection.) 

 3/cLu.dff. 2 wings of a different species. (Same collection.) 



Pteeotoceinus pyeamidalts Lyon and Cass. ........ 798 



4a. The type specimen; lateral view of the calyx. (Coll. S. S. Lyon.) 

 4b. Dorsal aspect of the same specimen. 



Pteeotoceinus chesteeensis Meek and Worthen 



5a. One of the type specimens.; lateral aspect. (After Meek and Worthen.) 

 5b. Another type specimen, showing the posterior side of the calyx. (After 

 Meek and Worthen.) 



Pteeotoceinus capitalis Lyon 794 



6a. Postero-lateral view of the type specimen. (Coll. S. S. Lyon.) 

 6b. Ventral aspect of the same. 



Pteeotoceinus coeonaeius Lyon 795 



7a. Ventral aspect of the type specimen. (Same collection.) 

 lb. Side view of the same ; the dorsal cup not preserved. 



