202 University of Kansas Geological Survey. 



but not quite vertical. The articular faces in the cervicals are 

 abroad, transverse oval, faintly emarginate above for the neural 

 canal. The quadrate has the same general form as in C.propy- 

 thon, but the external angle is situated further back, and has a 

 notch in its posterior margin directly above the meatal pit. 

 The posterior superior process is shorter, with a compressed 

 free end. The teeth are curved and somewhat compressed. 

 The enamel is smooth and shows faint indications of broad 

 facets on the basal half. There were at least fifteen pterygoid 

 teeth." In plate i, June, 1872, the author figures the coracoid, 

 scapula, quadrate, and pelvis. The coracoid, though incom- 

 plete, shows the absence of the emargination, as in fact the au- 

 thor explicitly states ( " There is certainly no emargination in 

 the coracoid of Clidastes, Edestosaurus , and Baptosaurus, as speci- 

 mens in the Yale museum conclusively prove"). It is true 

 that Marsh in a later paper 62 figured a specimen with emarginate 

 coracoid under the name of Edestosaurus dispar, but it is certain 

 that his identification of his own species was wrong, since no 

 species but C. velox ( and C. pumilus ) is yet known to have an 

 emarginate coracoid. The specimen figured was collected and 

 prepared by myself, and I have no hesitation in saying that the 

 species is C. velox. 



■ That the emargination was overlooked by the author seems 

 strange, since he separated Holosaurus at the same time from 

 Platecarpus (Lcstosaurus) upon that very character. If this char- 

 acter is of generic value, then C. velox must receive a new name, 

 since E. dispar is the type of Edestosaurus, and hence perfectly 

 synonymous with Clidastes. 



The paddles and quadrate agree quite with the corresponding 

 bones of C. tortor. The notch in the margin of the upper border 

 of the quadrate of C. dispar, upon which Marsh places much 

 importance, is an individual character only, and of slight im- 

 portance. 



Ed<stosaurus rex, Marsh described essentially as follows: 

 "The skull is elongate, the frontal converging very regularly 

 in front. The palatines have fourteen teeth. The shaft of the 



62. American Journ. Sci., xix, pi. I. f. 1, Jan. 18S0. 



