PLATE XIV. 



Page 

 GiLBERTSOCBINUS TYPOS (Hall) 242 



Fig. 1. Dorsal aspect of a large specimen with the appendages preserved nearly 

 entire. From the Burlington and Keokuk Transition Bed. 



2. Another specimen from the same horizon ; side view. 



3. A specimen from the Upper Burlington Limestone with the appendages and 



portions of the arms preserved. 



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



