CASE— AMPHIBIA AND PISCES 



■Cleithrum 



-Clavicle- 



1. Cacops aspidcphonts. No. 647 Univ. of Chicago. X '%. Scapula with 



attached cleithrum and clavicle; a, inner surface; b, outer surface. 



2. Aspidosaurus. X %'. Spines of dorsal vertebrae; a, from the left side; 



/), from in front. 



3. Desinospondylus aiioDialiis. X V3. Posteiior dorsal vertebrae; a, from the 



left side; b, intercentrum from below. 

 All figures after Williston. 



