THE 



AMERICAN JOURNAL OF SCIENCE 



[FIFTH SERIES.] 



Art. XL — Restoration of Blast omeryx marshi; by 

 Richard S. Lull. With Plate III. 



[Contributions from the Othniel Charles Marsh Publication Fund, Pea- 

 body Museum, Yale F/niversity, New Haven, Conn.] 



Ill this Journal for August, 1920, I described the skull 

 and jaws of a new species of Blast omeryx which was col- 

 lected by Professor Marsh in 1873 along the Niobrara 

 River not far from the mouth of Antelope Creek, 

 Nebraska. Further material pertaining to this species 

 has come to light in the skull and a considerable portion 

 of the skeleton of a second individual collected at the same 

 time and place and designated by Professor Marsh 

 "Rum[inant](XX)," the holotype, Cat. No. 10937, 

 Y.P.M., being "Runi.(X)." 



The second skull, Cat. No. 10756, Y. P. M., differs from 

 the type in its slightly smaller size, the teeth being in 

 about the same degree of wear in the relatively smaller 

 canine alveolus, and in the position of the horn, which is 

 not only smaller, but is set back from the rim of the orbit 

 as in the female prong-buck. One is therefore justified 

 in the assumption that this second specimen represents 

 the female of the species of which the holotype is the male. 



The skeletal material was so much more complete that a 

 mount of the animal was attempted, utilizing the male 

 skull and jaws and the female skeleton. Thus the mount 

 is composite, and embraces both Nos. 10937 and 10756, 

 difference in size of the skeletal parts present in each ani- 

 mal being almost negligible. 



Distally the limbs are beautifully preserved, including 

 the entire manus with complete lateral metacarpals and 

 digits. Whether the pes possessed lateral digits is not 

 clear. Proximally the posterior limb bones are rep re- 

 sented by articular portions only, althougJjHSI^ej^ jj 



Am. Jour. Sci.— Fifth Series, Vol. IIT, No. 15.— mAu$ 1922. 

 12 / 



P W4f? 6 1922 * 

 fa 



