the Marsh Collection. 395 



mandibular ramus ; Cat. No. 7915, paratype, upper denti- 

 tion; Cat. No. 7912, paratype, almost complete fore limb, 

 as well as several other fragments. Type locality, the 

 Cove, John Day basin, Oregon. Type level, upper John 

 Day (Promerycochoerus beds), uppermost levels, several 

 hundred feet above that of P. (G.J sternhergi. 



The association of this material under one species is 

 open to question. The mandible. No. 8179, which is the 

 first mentioned type, and therefore the holotype, is dis- 

 tinguished by increased size over that of P. sternhergi, 

 as well as by the absence of diastema between the lower 

 canine and outer incisor. The Yale specimen. Cat. No. 

 10921, comes from the type locality, and in so far as it is 

 preserved, agrees in detail with the type. It consists 

 of a muzzle, both upper and lower incisors, still embedded 

 in the matrix, together with the lower canines, Pj of the 

 right side, and a detached fragment of the right ramus 

 containing P^, M^.o. Fragments of the superior molars, 

 premolars and canine are also present. There is no 

 ditference in size, except that in the type, P^ is somewhat 

 smaller and P^ of the latter bears a small posterior cusp 

 on the external face which is lacking in the Yale specimen. 

 The teeth of the upper series (No. 7915, A. M. N. H.) are 

 too large, especially the premolars and first molar. The 

 ratios of Wortman's own measurements show the discrep- 

 ancy at once, thus : 



p. stern- P. came- 



hergi Eatio loides 



mm. mm. 



Length of upper molars and P ''"* 60 0.72 83 



Length of lower molars and F^.^ 65 0.67 97 



as the two series of sternhergi belong to the same indi- 

 vidual. 



Thus, the upper dentition of No. 7915, A. M. N. H., 

 paratype, pertains to a somewhat larger and more conser- 

 vative, although contemporaneous, specimen (see below). 



Cat. No. 10090, Y. P. M., is also probably to be referred 

 to Paratylopus cameloides, although an immature indi- 

 vidual. This specimen, consisting of a skull and jaws 

 collected by L. S. Davis in 1876 in the John Day valley, 

 Oregon, is from the same horizon as the type. It consists 

 of the skull from the middle of the orbits forward, the 

 hinder part not being preserved. The milk dentition is 

 present except for the upper median incisors. M2 is not 



