Cope.] 22 ^ [April 18, 1873. 



The tarsus (1) is generally longer and narrower, except in the case of 

 the cuboid bone (2) which is shorter than in T. roulini. (3) The astra- 

 galus has a narrower neck which therefore appears more on the • inner 

 side. (4) The facet for the cuboid is smaller. (5) The inner tuberosity 

 of the head is more prominent. (6) The calcaneum is more slender, with 

 larger cuboid facet, especially posteriorly. The metatarsus is absolutely 

 nearly as long as in T. roulini, and therefore relatively longer and more 

 slender. (3) The median (III) is nearly similar to the others in width ; 

 in the T. roulini, much larger than the lateral. 



The phalanges of the first cross series are more contracted distally. 



The more important differences between the skeletons of the two species 

 in addition to those pointed out under the head of the genus, are those 

 of the ulna, the scapula, the lumbar vertebra, the ilium and the crest of 

 the tibia. The scapula is more like that of Tapirus terrestris, while the 

 ilium is approximated by that of T. malayanus among living species ; 

 its form leans towards the Equine series, and not to the PakeotJieroid. 



Conclusion. From the preceding it is evident that there lived in North 

 America during the Eocene period, a type of Tapiridm only differing 

 generically from that now existing in South America. Thus one form of 

 the many peculiar and primitive ones of that time still persists in the 

 Tropics and Southern hemisphere, which claims more ancient character 

 than the Rhinocerus, Elephants, and other remains of Miocene time. 



The affinities of Cercoleptes and Nasua to the types of the same period 

 have been already indicated,* and with the present case may be regarded 

 as confirmatory of the proposition stating the early geologic state of the 

 existing Fauna Neotropica. 



At the Stated Meeting of the Society, June 20,1873,. 

 Professor Cope asked and obtained permission to withdraw 

 his paper on the Primitive Types ot the Orders of Mammalia 

 Edneabilia. 



The current number of the Proceedings having been 

 printed and ready for distribution, the register of the follow- 

 ing pages is left as originally printed. 



♦Sep on the Primitive types of the Mammalian Orders, 1&3. See oiiyiu of Genera, p. flfr 

 and preced. 



