1919] Merriam: Tertiary Mammalian Faunas of Mohave Desert 539 



nassial, and with smaller M 2 . This form is quite certainly a new 

 species of the A. wheelerianus type, but the writer prefers not to make 

 this imperfect specimen the type. 



Mj of no. 21225 is very large, exceeding the Barstow specimens 

 considerably in anteroposterior diameter. M 2 is represented by a 

 small alveolus for the anterior root, and a very minute pit behind it 

 which probably held the posterior root. There is no alveolus for M 3 . 



Comparative Measurements a. wheelerianus? 



No. 21225 No. 19455 



Ricardo Barstow 



Height of mandible below posterior end of M, 32.7 mm. a35.5 



Thickness of mandible below posterior end of M! 20.2 18 



Mi, anteroposterior diameter o35.7 28.4 



M 2 , anteroposterior diameter a9.6 10.3 



a, approximate. 



AELURODON ?, n. sp. B 



A fragment of a lower jaw, no. 21317 (fig. 148), without teeth 

 represents a canid species different from any of those reported from 

 this fauna. This form is smaller and with lighter mandible than 

 Aelurodon wheelerianus of the Barstow, and larger than Tcphrocyon 

 near temerarius of that fauna. It most nearly resembles A. wheeler- 

 ianus, and is tentatively referred to Aelurodon. 



Comparative Measurements 



No. 21317 No. 19455 



Ricardo Barstow 



Height of mandible below protoconid of Mo 29.6 mm. a35.5 



Thickness of mandible below protoconid of Mo 12.7 18 



Anteroposterior diameter of alveolus of M.. 12.8 10.3 



a, approximate. 



AELURODON or TEPHROCYON, sp. C 



A portion of a lower jaw, no. 21226 (figs. 147a, 147&), represents 

 a canid form much smaller than the three types referred tentatively 

 to Aelurodon, and certainly specifically different. The mandible is 

 heavy and thick, and the fragment of the carnassial present seems 

 to have a heavy crushing heel. The form is probably an Aelurodon 

 or Tephrocyon as yet undescribed. 



Measurements of no. 21226 



Height of mandible below heel of M, 23.7 mm. 



Thickness of mandible below heel of M, - — 11.9 



Mi, anteroposterior diameter «23.5 



Mj, transverse diameter of heel 9.1 



a, approximate. 



