196 THE WASATCH AND BRIDGER FAUN^. 



PSITTACOTHERIUM MULTIFRAGUM Cope. 



American Naturalist. 1862, p. 157 (Feb.)- 

 Plate XXIV c, fig. 2. 



This animal is represented by an almost entire mandible, whicli indi- 

 CJites an animal of about the size of the capybara {Hydrochoerus captjhara). 

 The specimen has been subjected to pressure which has pi'essed the sym- 

 physis backwards, and given it an angle with the ramus rather steeper than 

 the normal one. 



The base of the coronoid process is opposite the junction of the second 

 and tliird true molars. The ramus is deep and moderately stout. The 

 enamel of the first incisor does not extend below the alveolar border, at the 

 internal and external faces, and does not reach it at the sides. It has a few 

 wrinkles on the anterior face. The anterior enan:>el face of the second incisor 

 is thrown into shallow longitudinal grooves with more or less numerous 

 irregularities, from the low dividing ridges. There is a deeper groove on 

 each side of the tooth, and there are about a dozen ridges between these on 

 the anterior face. Both cusps of the first premolar are conic, and the exter- 

 nal is the larger. The second true molar is a little smaller than the first. 

 The enamel of the premolars and molars is smooth, and there are no cingula. 



Probable length of dental series .0750; diameters of I. 1: anteropos- 

 terior .0120, transverse .0066; diameters I. 2: anteroposterior .0160, trans- 

 verse .0115; diameters Pm. 1.: anteroposterior .0072, transverse .0130; di- 

 ameters of M. 11: anteroposterior .0090, transverse .0090. Length of true 

 molars .003b; depth of ramus at M. 11. .0360. 



The short deep jaws of this animal must have given it a very peculiar 

 appearance, not unlike that of a parrot in outline. 



PSITTACOTHERIUM ASPASKE CopC. 



PaleoDtological Bulletin No. 34, p. 192, Feb. 20, 1682; Proceed. Amer. Philos. Soc. 1881, p. li*2. 



Plato XXIV c, figs. 3-4. 



Represented by two mandibular rami of two individuals, one adult, the 

 other nearly .so, but with the last inferior molar not fully ))rotruded. The 

 latter specimen must be used for description, as it presents two molar teeth, 

 while the other specimen has lost them. 



The most obvious difference from the P. mHltifrayum is its inferior size^ 



