290 Annals of the Carnegie Museum. 



Measurements. 



mm. 



Fourth cervical. Greatest length 83 



Fourth cervical. Length of centrum 75 



Fourth cervical. Transverse diameter of centrum, anteriorly 14 



Fourth cervical. Vertical diameter of centrum, anteriorly 14 



Fifth Cervical. Greatest length 80 



Fifth Cervical. Length of centrum 72 



Fifth Cervical. Transverse diameter of centrum, anteriorly 16 



Fifth Cervical. Vertical diameter of centrum, anteriorly 15 



Fifth Cervical. Vertical diameter of centrum, including keel, posteriorly. 23 



Sixth Cervical. Greatest length 67 



Sixth Cervical. Transverse diameter of centrum, anteriorly 17 



Sixth Cervical. Vertical diameter of centrum, anteriorly 17 



Seventh Cervical. Greatest length 42 



Fore Limb. — The humerus of Stenomylus gracilis is relatively short. 

 The head is well formed and occupies a considerable portion of the 

 proximal end, with the antero-posterior diameter 2 apparently some- 

 what greater than the transverse. The great trochanter is very prom- 

 inent and rises high above the head, terminating radially in an obtuse 

 heavy tubercle, which overhangs the bicipital groove very extensively. 

 The lesser trochanter is also quite prominent and rises to a somewhat 

 less elevation, terminating in a laterally compressed tubercle, which 

 forms the radial border of the deep and narrow bicipital groove. On 

 the antero-radial face of the lesser tuberosity is a broad shallow 

 groove, which corresponds to the much deeper and narrower groove 

 in the recent camels. The deltoid ridge does not extend as low down 

 on the shaft, but terminates in a small oblong tubercle, which projects 

 over the ulnar border of the shaft. Below the deltoid ridge the shaft 

 is contracted rapidly in the antero-posterior direction, though of a 

 greater diameter in the latter direction than in the transverse, which 

 makes the cross-section ovate. Nearer the distal end the shaft 

 changes to a greater transverse diameter, which is due to the develop- 

 ment of the supinator ridge. The latter has the same relative devel- 

 opment as in Oxdactylus and Lama huanaco, but less than in Camelus 

 bactrianus. The transverse diameter of the distal end is considerable. 

 The supratrochlear fossa is low, shallow and broad. The anconeal 

 fossa is also rather low, but narrow and deep. The entepicondyle is 

 quite prominent and terminates distally in an enlarged tubercle which 



2 The proximal end of the humerus is slightly crushed, which undoubtedly adds 

 somewhat to this measurement. 



