MERRIAM: THE FAUNA OP RANCITO LA BREA. 



233 



c4 



a 2 



3 oq O 



H .„ -^ 



• rH O U 



'S ho a 



• £ =« 



Q ,3 Ph 



P 3 , greatest anteroposterior diam- 

 eter 19 



P 3 , greatest transverse diameter 



P 4 , greatest anteroposterior diam- 

 eter 32 



P 4 , greatest transverse diameter 



across denterocone 16.2 



P 4 , greatest transverse diameter 



across protocone 13 



M 1 , greatest anteroposterior diam- 

 eter 20 



M', greatest transverse diameter.. 24 



M 1 , transverse diameter of proto- 

 cone 13.6 



M 2 , greatest anteroposterior diam- 

 eter 10 



M-, greatest transverse diameter.... 15.4 



ap approximate. 



* Without posterior enamel. 



} Without enamel. 



■en 



C. dirus (6] 

 medium spe 

 Raucho La 



=h en 



>-. . 



BO 



m 



~ a 



a ~ 



'S- — 



'S x 







■f. 



| 



18.1 



18.2 



16.5 



17.33 







18.5 





17.5 



7.9 



8 











8 





7.4 



30.7 



32 ap 



24.5 



27 









33.8 



28.2 



15 14.5 ap 



14 



14.5 









16.9 



15.8 



13 





11 











15.3 



12.8 



18.7 



18.5* 



17.5 









18 



20 



16.4 



23 



21.5 

 12.6 



22.5 



23 







21.3 



25 



20.7 

 12.7 



9.2 



10 



10 











10.8 



9 



14.4 



14.9$ 



14 











14.6 



12.9 



Milk Dentition 



The milk dentition is well shown in several specimens. In no. 10831 it 

 presents the following characters: The superior temporary carnassial (figs. 12 

 and 13) has well-developed cutting blades; the inner root is situated almost 



13 



14 



15 



Pigs. 12 to 15. Canis dirus Leidy. Milk dentition. Figs. 12 and 13, no. 19475, natural size; figs. 14 and 15. 

 no. 19481, natural size. Fig. 12, upper milk carnassial, inner side; fig. 13, upper milk carnassial and tuber- 

 cular milk molar, occlusal view; fig. 14, lower milk carnassial and preceding tooth, inner side; fig. 15, 

 lower milk carnassial, occlusal view. Rancho La Brea Beds. 



directly above the apex of the protocone; there seems to have been no denter- 

 ocone present upon the base of the inner root, but there is a minute tubercle 

 on the cingulum a short distance in advance of the base of this root, and nearer 

 the normal position of the deuterocone on the permanent carnassial. In the 

 inferior milk carnassial (figs. 14 and 15) the cutting blades are well-developed 



