TRANSACTIONS OF WAGNER 



54 



PROCAMELUS 



teeth present assignable to either species, although two small caniniform teeth 

 are included in the collection which seem to belong to the smallest species. 

 Among some Florida fossils belonging to Mr. S. A. Robinson, of Orlando, is 

 a second right upper molar, plate xvii. fig. 18, which may belong to A. mcdhts. 

 It is unworn, very much smaller than the second molar of P. major, and 

 almost identical in size with the same tooth of P. occidcntalis. It agrees 

 almost exactly with the corresponding tooth of P. gracilis, shown in plate 

 Ixxvi. fig. 2, vol. iv., " U. S. Geographical Surveys West of the lOOth Merid- 

 ian." The species is there called P. occidcntalis , but in the " Report of the 

 Geological Survey of Texas" for 1892 Professor Cope points out that it is 

 really P. gracilis. 



The astragali ascribed to A. Minimus agree in size with those of P. gracilis 

 from Texas, and there is a possibility that the two species may prove to be 

 identical, although the length and proportions of the metatarsus and phalan- 

 ges seem to indicate that A. minimus was a little the larger of the two and 

 stood somewhat higher on its legs. 



The appended descriptions, with the exception of the section pertaining 

 to the phalanges, had been prepared by Dr. Leidy. 



F. A. L. 



Among the fossil remains from Mixon's bone-bed, collected at different 

 times, are many bones, with fragments of others and teeth, mostly isolated 

 specimens, of extinct species of Llama. Many astragali, numbers of calcanei, 

 phalanges, patellae, and articular ends of the larger limb-bones, from their 

 relative proportions, indicate apparently at least three distinct species. The 

 specimens referred to each of these also show variations in size, in some cases 

 to such a degree as to render their reference less certain. The largest species 

 was considerably larger than the Camel, the second species was somewhat 

 smaller than that animal, and the third one was little more than half the size 

 of the first, but yet considerably larger than the existing Llama. 



A series of the largest specimens of the fossil astragali, plate xviii. figs. 

 1,5, and 7, in comparison with those at our command, pertaining to the Camel, 

 Llama, and Huanaco, exhibit the following measurements : 



P. major. P. medius. P. minimus. Camel. Llama. Huanaco. 



Length of astraga- 

 lus internally . 100 mm. 67 mm. 56mm. 75mm. 43mm. 39mm. 



Width of astragalus 



distally . 65 " 46 " 35 " 50 " 28 " 25 " 



