356 University of California Publications in Geology [Vol. 12 



same author mentions Platygonus compressus as being less robust. 

 The corresponding teeth of Platygonus texanus Gidley** are unknown, 

 though the broken alveoli suggest larger canines than those indicated 

 b.y the alveoli of the describer's accompanying figure of the slcull of 

 P. vetus Leidy. The alveolar measiirements of P. vetus equal the 

 measurements of the present specimens ; but the measurements of 

 P. vetus are taken from the figure and perhaps through the usual 

 shrinking away of alveolar edges indicate too great a size. 



The canines are much longer and heavier than those of the living 

 forms, excepting perhaps P. labiatus, the upper canines of which by 

 Dr. Leidy 's measurements (16.7 x 14.4 mm.) are fully as heavy as the 

 Eden specimens.*^ 



Measurements 





Specimen 

 no. 23439 



Specimen 

 no. 23440 



Total length in straight line 



a84 mm. 



94.5 mm. 



Length from alveolar border 





50 



Total length along front curve 



94.5 



116 



Length from alveolar border 



5'5.5 



55 



Anteroposterior diameter at alveolar border 



16.5 



14.2 



Transverse diameter — . 



12.4 



11 



a, approximate. 



Camelidae 



Camels evidently occupied a very important place in the Eden 

 fauna, the discovered remains indicating species of great range of 

 form and size. More ample material may confirm the suggested pres- 

 ence of characters of new generic rank in one or more of the species, 

 which apparently lie in the gap between Pliauchenia and Camclus 

 rather tlian within either genus, as at present defined. 



The Eden specimens, so far as observable (note figs. 66, 74-83) 

 differ in the dentition from both Auchenia and Camelops by. the 

 retention of the first premolar. By the apparent absence of the 

 second premolar the specimens differ from the Miocene genus Pro- 

 eanielus and agree with PliaucJienia of the Pliocene. It has seemed 

 expedient instead of referring all the material to the latter group, to 

 recognize the very marked size characters exhibited by the specimens 



4* Gidley, J. W. On Two Species of Platygonus from the Pliocene of Texas. 

 Bull. Am. Mus. Nat. Hist., vol. 19, pp. 479, 190.3. 



45 Leidy, Joseph. The Extinct Mammalian Fauna of Dakota and Nebraska. 

 . . . Synopsis of the Mammalian Eemains of North America. Jour. Acad. Nat. 

 Sci. P'hila., (2), vol. VII, p. 387, 1869. 



