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University of California Publications in Geology [Vol. 11 



Fig. 220. Procamelus? ', sp. Proximal facets of cannon bone of posterior limb, 

 no. 23117, X %. Ricardo Pliocene, Mohave Desert, California. 



Fig. 221. Alticamelus or Pliauchenia?. Proximal facets of cannon bone of 

 posterior limb, no. 23116, X Ricardo Pliocene, Mohave Desert, California. 



Fig. 222. Pliauchenia or Alticamelus? Proximal facets of cannon bone of 

 posterior limb, no. 23118, X %. Ricardo Pliocene, Mohave Desert, California. 



Figs. 223 to 227. First phalanges, X %. Fig. 223, Alticamelus?, sp., no. 

 21563; fig. 221, Pliauchenia?, sp., no. 21561; figs. 225 and 226, Alticamelus or 

 Procamelus, sp., no. 23119 and no. 23114; fig. 227, Procamelus, sp., no. 22517. 

 Ricardo Pliocene, Mohave Desert, California. 



CAMELIDAE 



The camel remains from the Ricardo beds consist almost exclu- 

 sively of limb bones. Only a few jaw fragments are known, of which 

 a mandible with several molar teeth (no. 22516, figs. 216a, 216&) is 

 the most important specimen. 



At least two camel types are represented in jaw fragments found 

 at Ricardo. One, a small form represented by fig. 218, presumably 

 belonging to the genus Procamelus ; a larger form, fig. 217, is possibly 

 Alticamelus. 



