734 5. W. WILLISTON 



Length 351 mm 



Least diameter of shaft 87 



Greatest width 250 



The next paper of this series will be devoted to a discussion of 



the Jurassic species. 



.•^^ 



Fig. 15. — Trinacromerum latimamis. Left humerus, dorsal side, three-sevenths 

 natural size. 



