Vol. 4| Sinclair. — Mammalia from Quaternary Caves. 



149 



PLATYGONUS ( ?), sp. 

 Text, Fig. 1. 



Locality. — Potter Creek Clave, Shasta Co., California. 

 Three specimens from the Potter Creek Cave are doubtfully 

 referred to this genus. Two of them are superior molars which 

 are so poorly preserved and so badly worn that little can be 

 determined regarding them. When first examined, they were 

 thought to be referable to a Large species of tapir and were 

 so listed in the writer's preliminary paper.* 5 The third speci- 

 men, a lower molar corresponding in size with the teeth of the 

 superior series, is represented in text figure 1. The crown 



Fig. 1. Fig. 2. 



Fig. 1. Platygoinis, sp. Potter Creek Cave. 

 Fig. 2. Camel tooth. Potter Creek Cave. 



is divided into two transverse lobes by a deep valley which 

 is unobstructed by ridges or tubercles. The notching of the 

 anterior crest is slight, that of the posterior crest deep. A 

 prominent extension of the cingulum posteriorly forms a heel 

 which appears to have been more or less continuous around 

 the external edge of the posterior lobe and to have joined a 

 small tubercle at the outer margin of the transverse valley. 

 This could not be well brought out in the figure as the enamel 

 has been broken off, exposing the dentine. Anteriorly, there 

 are traces of a narrow cingulum, but none exists internally. 

 If the generic position of the specimen has been correctly deter- 

 mined, the remains indicate a species of Platygontis larger than 

 any previously described. 



Measurements. 



Antero-posterior diameter of inferior molar 30 mm 



Transverse diameter at widest part 23.5 



* Science, N.S., Vol. XVII, pp. 708-712, 1903. 



