450 0. 0. Marsh — Neio Fossil Reptiles from 



and the writer, in the gray Cretaceous shale, on the North Fork 

 of the Smoky River, in Kansas. 



Edestosaurus velox^ sp. nov. 

 This species was about two thirds the size of the preceding 

 one, and very nearly allied to it. It is represented at present 

 by a number of specimens found together, including tlie orp.tP,. 

 part of the skull, with the quadrates, and several v.Tt ^;;'. 

 wJiich, however, are too much crushed to give reliable iur 

 rnents. Another series of specimens, consisting main! \- of; 

 rior dorsal vertebrae, well preserved, was found near \\\v n r. 

 locality and appears specifically identical. They are thcrcibre 

 included in the description of the species, and furnish the ver- 

 tebral characters of the doi-sal rearion, where the first series is 

 deficient. 



The muzzle in this species is obtusely pointed. The pre- 

 maxillary is narrow aod simple, and unites with the maxillaries, 

 anteriorly at least, by suture, differing in this respect from the 

 known species of Clidastes. There are four preniaxillary teeth, 

 smooth and subcompressed, like those of the maxillaries. The 

 pterygoid bones are very similar to those of the preceding 

 species. The quadrate, also, has the same general form, but 

 presents several marked differences. The great ala is less 

 curved vertically, and is concave transversely on both surfaces. 

 The alar process has its articular surface very narrow in its ex- 

 tension over the great ala, while in E. dispar, it is broad and 

 abruptly terminated. There is no notch in the posterior mar- 

 gin of the external angle. On the ridge below this angle, and 

 nearly opposite the meatal pit, there is a prominent rugosity. 

 which is radimentary or wanting in the larger species. In the 

 latter, moreover, the'posterior margin of the hook is reflected for 

 some distance, producing a broad articular face. In the present 

 species, this surface is only represented by a narrow tongue, 

 projecting toward the meatal pit. 



In the cervical and dorsal vertebrae, the articular faces are 

 transverse, and in the latter, distinctly cordate, the superior 

 emargination being deeper than in the preceding species. Id "le 

 anterior dorsal region, the vertebrae have a more transverse cup 

 and ball, which are also apparently more inclined from a vertical. 



Length of anterior dorsal vertebra, from edsje of cup to 



end of ball,.... ..22- hues. 



Width of ball, .12- " 

 Depth of ball,.. " 10- " 



Length of pterygoid bearing five anterior teeth, 25-5 " 



Length of pterygoid with five posterior teeth, 1 9' ,, 



Length of quadrate,. 27-7o ^^ 



Transverse diameter of lower end, . ] l"^" 



