PLATE XVII. 



Page 

 GlLBEETSOCEINUS EETICULATUS (Hall) 244 



Fig. la. Dorsal aspect of the calyx. 



lb. Lateral view of another specimen. 



Gilbeetsocbinus fiscellus (M. and W.) . 245 



2a. Anterior view of calyx. 

 2b. Posterior view of same. 

 2c. Ventral aspect of same. 



2d. Posterior view of another specimen, in which the appendages next to the 

 posterior side separate within the calyx. 



Gilbeetsoceinds tenuieadiatus (M. and W.) 246 



3. Dorsal aspect of a crushed specimen, showing parts of the appendages. 



Gilbeetsoceinus obovatus (M. and W.) 241 



4a. Side view of calyx. 



4o. Ventral aspect of same. (Figure drawn anal side up.) 



Gilbeetsoceixus tubercuxosus (Hall) 243 



5a. A. specimen with arms, appendages, and stem. 

 5b. Dorsal aspect of another specimen. 

 5c. Ventral aspect of same. 



Gilbeetsoceinus tubeeosus (Lyon and Cass) ....... 239 



6. Dorsal aspect of calyx. 



Gilbeetsoceinus typus (Hall) 242 



7a. A large specimen from the Upper Burlington Limestone. 

 lb. Portion of the arms, showing mode of bifurcation. 



(All specimens in the collection of Wachsmuth and Springer.) 



