IP. (J. Knight — New Jurassic Vertebrates. 117 



covered in the Shirley* stage of the Jurassic rocks of Albany 

 County, Wyoming, and was associated with Baptanodon discus, 

 Ostrea strigilecida, Camptoneeies bellistriatus and Astarta 

 Paclcardi. Type specimen marked letter H in the collection 

 of the University of Wyoming. 



Cimoliosaurus laramiensis sp. nov. 



This specimen consists of numerous vertebra and nearly a 

 complete front limb. The humerus conforms to the general 

 shape of Cimoliosaurs, but whether it belongs to the division 

 where ulna and radius articulate with the humerus or to the 

 other group where the pisiform is present, cannot be satisfac- 

 torily determined. There are two very distinct facets at the 

 distal end of the humerus ; the remainder of the margin is 

 rounded and shows no sign of a pisiform. The facet for the 

 radius occupies over one-half of the width of the expanded 

 end, and is nearly flat. The humerus is a short, heavy bone, 

 broadly expanded distally, and the post-axial border slightly 

 recurved. Trochanteric ridge very prominent ; shaft trans- 

 versely elliptical with a rugose prominence on the anterior 

 border, # 120 m below the head ; apparently for the attachment 

 of a large muscle ; head spherical. Radius Y-shape with the 

 angle truncated and toward the ulna. The articulations of the 

 ulna slightly convex; the proximal end very wide, distal nar- 

 row, and the ulna and radius evidently uniting without a cen- 

 tral opening; exterior margin curved and very thin. Ulna 

 not known. There are six carpal bones, all angular, but their 

 relative position has not been determined. 



Metacarpals and basal phalanges only slightly compressed 

 and with flattened shafts, the upper surface slightly rounded, 

 with a depression on either side, making a transverse section as 

 figure in plate B, No. 1 ; they are also biconvex with pitted 

 terminations. The terminal phalanges are much more com- 

 pressed and without the depressions on the surface. All the 

 vertebra wider than long and moderately biconcave, with 

 neural arches firmly attached. Dorsal vertebra with a forward 

 overhanging of the centra as is usually found in Cimolio- 

 saurs, and circular in transverse section. Cervical vertebra 

 numerous and anterior ones very small. 



Caudle vertebra large, elliptical in transverse section. Ante- 

 rior ones with large transverse processes, and large angular 

 chevron facets. 



*This is a new name applied to the Rocky Mountain marine Jurassic. See 

 paper presented by me to the Geological Society of America, December 30, 1899. 



