112 University of California Publications in Geology [Vol. 9 



In the preparation of this paper, the author has been very deeply 

 indebted to Professor J. C. Merriam for his kind assistance and co- 

 operation, and to Mr. Frank S. Daggett of the Museum of History, 

 Science and Art in Los Angeles, for his generous loan of material 

 from that museum. 



SKULL AND HORN-CORE 



Although a considerable quantity of limb bones have been found 

 belonging to this species, there have been discovered up to the present 

 time only a few fragments of skull, two of which include the region 

 of the horn-core and dorsal part of the orbit. Two pieces represent 

 upper jaws with M 1 and M 2 in place in one specimen, and three milk 

 molars in another. 



Specimen no. 21445 is a small portion of the dorsal part of the 

 forehead, from the nasal bones to the occipital ridge, and including 

 the dorsal rim of the orbit on the right side, but broken off at 

 the region of the frontal foramen on the left side. This interesting 

 specimen shows the same general contour lines as does Antilocapra. 

 It has a prominent orbit, the high arch of the forehead comes between 

 the orbits, instead of behind them as in the deer, and there is a con- 

 siderable concavity between the anterior borders of the orbits. Whether 

 the nasal bones arched up as prominently as in Antilocapra is a matter 

 of conjecture, but the remarkable similarity of the lines of the skull 

 immediately behind the nasal region to the corresponding parts in 

 Antilocapra makes it seem highly probable that Capromeryx had a 

 similar high-arched nasal region. The frontal foramen has a single 

 opening instead of a double one, and lies in a more marked groove 

 than in Antilocapra, in this feature approaching more nearly the deer. 

 There is also, in this species, a shallow pit lying posterior to the frontal 

 foramen, and just external to this a very minute tubercle which, by 

 analogy with Antilocapra, represent a rudimentary horn-core of a 

 female animal, although in Antilocapra it is considerably more con- 

 spicuous. 



Specimen no. 49 of the Museum of History, Science and Art of 

 Los Angeles consists of the right side of the parietal and frontal bones 

 with the horn-core and about one-half of the orbit. In the general 

 characters of the skull this specimen agrees perfectly with no. 21445, 

 except that the pit just medial to the horn-core is considerably deeper 

 and more marked. 



