iQoi.] Matthew, Additional Observations on the Creodonta. 25 



Bridger Beds, Wyoming. This species was founded on part of 

 the crown of a lower molar, subsequently lost or mislaid, and the 

 tip of a premolar crown. It is indeterminate specifically, gener- 

 ically or even in family, and the name has no standing. The 

 upper and lower jaws in the Princeton Museum figured and re- 

 ferred to this species by Prof. Cope in 1884 more probably belong 

 to S. strenua. 



Sinopa hians {^Cope). 



Stypolophus hians Cope, Rep. Wheeler Survey, Vol. IV, pt, ii, p. 118, pi. 

 xxxviii, figs. 12-20. 



Wasatch of New Mexico and Wyoming. The type is an 

 extremely fragmentary and badly preserved skeleton from the 

 Wasatch of New Mexico. The anterior premolars are spaced 

 and the last two lower molars subequal. Fourth premolar wider 

 posteriorly. The other characters given by Prof. Cope are 

 common to the genus. 



The most important distinctive character seems to be the sub- 

 equal second and third molars. On this ground I place here No. 

 2850 Amer. Mus. Coll., which agrees fairly well in size, has the 

 anterior premolars somewhat less spaced, and a narrower heel to 

 Pj. It is a young individual, with teeth scarcely worn, hence 

 perhaps the less spacing of the premolars. It consists of upper 

 and lower jaws, fragments of the skull, a few vertebrae, and parts 

 of nearly all the limb bones. 



Third lower molar as large as second, first considerably smaller. 

 Angle between anterior and posterior shear of lower trigonids 

 averaging 45°. Incisors present but number uncertain. Meta- 

 style on p^ small. Pa. and me. rather closely connate. M-^ 

 considerably reduced with vestigial metacone. 



The brain is smaller than that of Cynohycenodon cayluxi d\\\-\o\\^\ 

 the dentition is one third longer. Compared with that of Thyla- 

 cinus the brain is much smaller in all dimensions, smoother in 

 surface, and with olfactory and cerebellar lobes smaller in pro- 

 portion, but not in any degree covered by the cerebral lobes. 



The limb bones are for the most part a little stouter than those 

 of the domestic cat, not very different in size from those of 

 xS. whitia. They are apparently shorter and stouter in propor- 

 tion, resembling those of Viverravus protenus on a smaller scale. 

 The vertebra are too poorly preserved for exact comparison. 



