270 Annals of the Carnegie Museum. 



vertebrae in the caudal region of the recent form while in the fossil 

 there are fourteen. 



The scapula is remarkably similar to that bone in the lama, the 

 spine being located a little further from the coracoid border and the 

 glenoid border being more prominently everted than in the latter. 

 The humerus is considerably shorter than the radius and ulna, while 

 in the lama they are of more nearly equal length. The carpus is higher 

 and narrower; the trapezium is present and has an articulation with 

 the distal palmar angle of the scaphoid as well as with the palmar 

 face of the trapezoid. In the lama the trapezium is absent. The 

 proportionate length of the metacarpals (canon bone) to the radius and 

 ulna is about the same as in recent forms, but the humerus is con- 

 siderably longer in the latter. The length of the phalanges is different 

 in proportion from those in the lama, i. e., the proximal is shorter, 

 while the median and terminal are longer. There is little or no evi- 

 dence of support for a tylopodous cushion; the tubercles on the plantar 

 face of the phalanges are, however, less prominent than they are in 

 other Miocene camels (Oxydactylus) and it is possible that there was a 

 tendency to develop these characteristic pads, especially on the second 

 phalanx of the feet of this animal. 



The pelvis is somewhat longer and narrower than in the lama 

 The expansion of the ilium is, however, very abrupt as in the latter. 

 The point of the ilium and the tuberosity of the ischium is longer and 

 sharper in the fossil form. As is the case with the humerus of the 

 fore limb we find the femur proportionally shorter than in the lama 

 while the tibia is somewhat longer. The tarsus is distinctly higher 

 and narrower while the metatarsals are fused into a canon-bone and 

 are of much similarity in the two forms. The phalanges of the hind 

 foot are similar to those of the fore foot, /. e., the proximal shorter, 

 the median and terminal longer than in Lama. 



The proportion of the head to the body is not unlike that in Oxy- 

 dactylus longipes, while the thoracic cavity is somewhat greater. 

 The structure and proportions of the limbs more nearly agree with 

 those in Oxydactylus longipes than in the genus Lama, the femur of 

 Oxydactylus, however, being longer in proportion to that in Stenomylus. 

 As a whole the skeleton of the latter indicates structures of greater 

 endurance than in Lama and even perhaps greater than in the co- 

 temporaneous long-limbed form Oxydactylus. Thus it is seen that 

 the femur is shorter than in the latter, while the humerus is pretty 



