164 



University of California Publications. 



[Geology 



in the Quaternary deposits of the Potter Creek Cave. 14 Asso- 

 ciated with it were the remains of Arctotherium simum, Eucera- 

 thervmn collinum, also the remains of deer, camel, horse, and 

 large quantities of rodent bones. Mr. Sinclair has determined 

 the cave deposits as Quaternary. 



This specimen belongs to a very large species, probably very 

 close to the African lion in size. Comparison with a young 

 African lion shows how closely the measurements agree. (See 

 table of measurements. ) The milk carnassial of the recent moun- 



tain lion is much smaller than 3825. The tooth differs markedly 

 from the milk sectorial of 8. calif omicns, the latter having but a 

 single protostyle and being somewhat shorter. M, sivalensis has 

 two anterior cusps, but the secondary cusp is smaller and less 

 developed than the protostyle. The position and size of the an- 

 terior cusps indicate that this tooth belonged to a very large cat 

 of the true Felis type. The only true Felis known in California 

 that could approach in size such an individual as is represented 

 by the milk tooth 3825 is the imperfectly known Felis imperialis 

 Leidy. More material is necessary before anything more than a 

 tentative opinion regarding the affinities of this form can be 

 reached. 



Comparative measurements of left superior milk carnassials : 



O Q 9 K 



-p -p + x 8762 8761 Machaerodus 



irom rotter African Lion . p um a. sivalensis. 

 Creek Cave. 



Anteroposterior diameter . 24.6 mm. 24.3 mm. 16 mm. 19 mm. 



Transverse diameter 8.2 8 4.6 5 



FELIS IMPERIALIS Leidy. 

 Felis imperialis Leidy, U. S. Geol. of Ter., Vol. I, p. 228, pi. XXXI, fig. 3. 



The only known specimen of this large species was found 

 twenty-five miles east of San Leandro, California. The exact 

 location is not known. The specimen consists of a fragment of 

 a maxillary showing the second and third premolars and a por- 

 tion of the alveolus of the canine. It appears to represent a true 

 Felis slightly larger than the Bengal tiger. 



14 Sinclair, W. J., Univ. of Calif. Pub. Am. Arch, and Eth., Vol. 2, No. 1. 



