452 0. a Marsh— New Fossil Reptiles from 



two hundred vetebrae in the entire column, and tence indicates 

 for these reptiles a much more attenuated, serpent-like form 

 than has hitherto been supposed. The present species was 

 probably about eighteen feet in length. 



Length of axis, with odontoid process, 19* fines. 



Width between diapophyses, 17' " 



Width of ball, 8- " 



Depthofball, V " 



Depth of centrum, with attached hypapophysis, 10-3 " 



Length of sixth cervical, without ball, 13- " 



Length of neural arch, 10' " 



Width in narrowest point, 6*40 " 



Width of cup, 9- ^' 



Distance from end of muzzle to center of first tooth,. . . 5-5 

 Length of caudal on which diapophyses first disappear, 9-1 



Widthofcup, 9 " 



Depthofcup, 9- '^ 



Length of caudal, apparently next to last, ^'^^ " 



Transverse diameter of same, '95 



This species is named in honor of Professor Jeffries Wvman. 

 of Harvard University. The remains at present representing 

 it are from the gray Cretaceous shale of Western Kansas. The 

 first series of specimens here described was discovered by Mr. 

 H. B. Sargent, on the North Fork of the Smoky Eiver. The 

 caudal series was found by the writer, about ten mdes further 

 east, near the Smoky River. 



Clidastes pumilus, sp. nov. 



The smallest Mosasauroid reptile at present known is indi- 

 cated by the anterior portion of a skeleton, which appeare to De 

 specifically distinct from any hitherto described, although seem^ 

 ingly most nearly related to the species characterized m tn 

 preceding description. Aside from the more diminutive size, 

 however, there are several noticeable differences. In ^^^^ Ff' 

 ent species, the inner third of the distal articular surface ot tue 

 quadrate is much broader, and less separated by constnctio" 

 from the main condylar surface. The cotylus of the articu ^^^ 

 bone, also, has a corresponding greater width. The ^?^^^ 

 knob near the distal end of the quadrate is similar to that 

 the last species, but has no pit beneath it. The hook is com 

 paratively short, and has a free compressed extremity, i-^ 

 ticular margin is not deflected toward the meatus. The basioc^ 

 cipital is longer, deeply excavated for the neural canal, ana 

 condyle is much less elevated. The teeth are nearly rouna^^ 



rlyr 

 .el. 

 ticular faces of the cervical vertebrae are nearly \ 



the base, somewhat curved, and with smooth enamel. _ - , 

 - ' ^ vertical, ana 



