198 University of Kansas Geological Survey. 



Clidastes cineriarurii. 



Clidastes cineriarum Cope, Proc. Amer. Phil. Soc. 1870, p. 583. Cret. Vert. 

 etc., pp. 137, 266: pi. xxi, ff. 14-17. Bull. U. S. Geol. Surv., Hayden, in, 

 p. 583. 



''The type specimen of this species consists of vertebrae and 

 pterygoid teeth. There are two anterior dorsals, three lurnbars 

 [pygals] and one caudal. The articular faces of the caudals 

 are broad vertical ovals." This practically is all that is given 

 to distinguish the species, a character that is more or less 

 illusory and unsatisfactory, and in this present case wholly 

 insufficient. "The centrum of the anterior dorsal is much 

 compressed." Collected by Professor Mudge, six miles south 

 of Sheridan. 



Clidastes velox. 



Edestosaurus velox Marsh, Amer. Journ. Sci., i, p. 450, June, 1871. 

 Edestosaurus pumilus Marsh, 1. c, p. 452. 



Clidastes affinis Leidy, Rep. U. S. Geol. Surv., Hayden, p. 283, 1873. 

 Edestosaurus dispar Marsh, Amer. Journ. Sci., xxix, pi. i, Jan. 1880. 

 Clidastes velox Williston and Case, Kans. Univ. Quart , i, 15, pis. n, in, 



1892. Williston, Kans. Univ. Quart., n, p. 83, pi. in. Merriam, Ueber die 



Pyth., etc., p. 31, pi. in. 



This species has been used in the foregoing pages as typical 

 of the genus, and a description of the different parts is given 

 in detail, as based upon an unusually perfect skeleton discov- 

 ered by myself in the summer of 1891 and now mounted in the 

 museum. See plate lxii. 



The diagnostic characters of the species are found in the 

 structure of the quadrate, as described on a preceding page, in 

 the emarginate coracoid, and in the structure of the front pad- 

 dles, especially the forearm and carpal bones. 



Marsh has figured a specimen of Clidastes with emarginate 

 coracoid under the name of C. dispar, but, from my memory 

 of the specimen, which was collected by myself, I am quite 

 sure that he was wrong in its determination. The quad- 

 rates of the two species are readily distinguishable, and the 

 figure of the type of C. dispar shows that it cannot possibly be 

 the same as this. Cope expressed the opinion to me that 

 the presence or absence of an emargination in the coracoid is 



