PLATE XVII. 



Page 

 GiLBEETSOCEINUS EETICULATUS (Hall) 244 



Fig. li:'. Dorsal aspect of the calyx. 



lb. Lateral view of another specimen. 



GiLBEKTSocKiNus FiscELLUs (M. and W.) . 245 



2(1. 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. 



Gii-BEETSOCRINUS TENuiRADiATUS (M. and W.) 246 



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



GiLBEETSOCEINUS OBOVATUS (M. and W.) . 241 



4«. Side view of calyx. 



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



GiLBEETSOCEINUS TUBEECULOSUS (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 TTPUS (Hall) 242 



111. A large specimen from the Uppter Burlington Limestone. 

 7b. Portion of the arms, showing mode of bifurcation. 



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



