6 S. W. WILLISTON 



extending to the premaxillaries or anterior nares as in Teleorhinus. 

 The elongation of the nasals occurs also in other longirostres, like 

 Teleidosaurus, etc., as well as in most of the brevirostrate amphi- 

 coelian forms, such as Goniopholis, Nanosuchus, Notosuchus, and 

 Petrosuchus. In all, or nearly all, reptiles having a greatly elongated 

 mandibular symphysis, the splenial takes part in the union, as in 

 Teleidosaurus, Hyposaurus, and other longirostrate amphicoelians, 

 the gavials, plesiosaurs, Champsosaurus, etc. Most of the other 

 characters given by O shorn for Teleorhinus are of wider than generic 

 application, save the antero-posterior compression of the teeth, which 

 also occurs in other of the long-snouted amphicoelian forms. It is 

 therefore difficult to interpret the affinities of his genus prior to a 

 more complete description of the excellent material upon which it was 

 based. I have scarcely a doubt, however, that it belongs with the 

 Pholidosauridse rather than the Teleosauridae. 



During the past season several specimens, more or less frag- 

 mentary, of longirostrate crocodiles, including the posterior part of 

 two skulls, quite different from each other, and cervical vertebrae 

 were obtained from the Hailey shales of western Wyoming, by the 

 University of Chicago party. I was first inclined to locate their 

 horizon in the Niobrara, because of the presence of a distinctly 

 Niobraran genus of plesiosaurs, but a more careful study of the 

 stratigraphy of the Benton convinces me that it belongs somewhere 

 in the Carlyle formation. The skulls both agree in having very 

 narrow parietals, very large supratemporal fenestras, small latero- 

 temporal vacuities, and large orbits. The upward process from the 

 jugal seems, in one of the specimens at least, to be internal, as in the 

 PhoUdosauridae. I cannot distinguish either of the species at 

 present from Hyposaurus, though it is not impossible that one or 

 the other may be Teleorhinus hrowni O shorn. From the lowermost 

 part of the Benton, just above the Dakota, Mr. William Reed some 

 years ago collected a longirostrate skull in Wyoming. It would seem, 

 hence, that crocodile remains are widely distributed throughout the 

 Benton of the Rocky Mountain region. 



In 1872 Cope named, ^ and in a later work figured,^ a single 



1 Cope, Proceedings of the American Philosophical Society, Vol. XII, p. 31c. 



2 Cope, Cretaceous Vertebrata (1875), p. 52, Plate IX, Figs. 8, 8d. 



