No. 555] 



NOTES AND LITERATURE 



189 



terms. The species is without doubt valid and is a very interest- 

 ing one in showing a new type of tooth for the mosasaurs, wherein 

 the tooth is a rounded ball instead of being sharp as in the ma- 

 jority of known mosasaurs. From its rarity one may be inclined 

 to question the normal condition of the teeth, but all the teeth 

 display the same characters, so Mr. Gilmore is justified in his 

 assumptions of the distinction of the form so far as the evidence 

 goes. The species is said to be related to Platecarpus which is 

 the common mosasaur of Kansas ; but we may question whether 

 it is a true mosasauroid. 



Mr. Maurice G. Mehl 7 lias described and illustrated an incom- 

 plete skull of the interesting and little known cotylosaur, Pan- 

 tylus cordatus Cope, from the Permian Red Beds of Texas. The 

 species has been given the rank of a suborder, the Pantylosauria, 

 by Case in his monograph of the Cotylosauria. The form is, how- 

 ever, known only from the skull and such reference may be sub- 

 ject to revision. Mr. Mehl was able, from the recently acquired 

 material, to more fully describe the dentition of this mollusc- 

 feeding animal. lie illustrates his discussion by several line 

 figures. 



The history of the dinosaurs will always be an interesting topic 

 for paleontologists. The recent contribution by Mr. Charles W. 

 Gilmore 8 is an attempt toward the completion of the history of 

 this group of animals, wherein he describes "The Mounted 

 Skeletons of Camptosaurus in the United States National Mu- 

 seum." His discussion is illustrated by drawings and photo- 

 graphs with a map of one of the Como, Wyoming, quarries show- 

 ing the positions of the Camptosaurus bones in the quarry. The 

 skeletons of the two species are mounted in the attitudes of walk- 

 ing on all fours and the erect attitude, which was possibly char- 

 acteristic of many of the Theropoda. The animals are repre- 

 sented as being seniiplanti-rade in the hind foot and semidigiti- 

 grade in the fore. 



Walter Granger 9 has given a few notes on the locality and 

 manner of collection of "a new specimen of the four-toed horse" 

 discovered "in the extreme northwestern corner of Wyoming, in 

 the Wahsatch formation of the Big Horn Basin." Since the 

 form had previously been known only from fragments of jaws 

 containing teeth, the recent find is a remarkably large addition 

 7 Journal of Geology, XX, No. 1, 21, 1912. 



*Proc. V. S. Natl Museum. 41. 887-696, pis. 55-61, February 8, 1912. 

 * American Museum Journal, XI, No. 3, pp. 85-88. 



