FOSSIL VERTEBRATES FROM SAN PEDRO VALLEY—GAZIN 497 
ing the camels of the genus Pliauchenia considered the Blanco species 
to belong in Megatylopus. Barbour and Schultz,’ on the other hand. 
considered Mf. ? spatula to be closer to their Gigantocamelus fricki. 
No doubt the number of generic as well as specific names that have 
been applied to late Pliocene and Pleistocene camels of North America 
will be reduced when further study is made of these forms. ‘The record 
suggests a group of large camels in the upper Pliocene and early 
Pleistocene of North America, probably related to Paracamelus, with 
species occurring in the Blanco, Keams Canyon, Hagerman, Lisco, 
San Pedro Valley, and certain other deposits; secondly, Camelops, a 
group of moderately large and otherwise distinctive camels, remains 
of which are found at numerous Pleistocene localities; and third, 
Tanupolama, in upper Pliocene time as well as in various stages of 
the Pleistocene of North America, being a smaller, long and slender 
limbed form, related to the South American lama. 
Antilocaprid sp., possibly TEXOCEROS sp. 
Fragments of the right and left rami of an immature man- 
dible, No. 12860, including the deciduous premolars in each and 
M, in the right ramus, and an isolated molar were cited by Gid- 
ley as representing a species of Merycodus. There is, however, no 
necessity for regarding this material as merycodont as the teeth are 
very close to those seen in an immature individual of Antilocapra 
americana. ‘The teeth are relatively small and on the basis of the 
material at hand can be described only as antilocaprid. 
Frick (1987, p. 507) indicated most of an upper dentition and a 
couple of isolated molars in his collection from Benson which he re- 
ferred tentatively to T’exoceros sp. The National Museum specimen 
may represent this or Capromeryx but is too incomplete for satis- 
factory comparisons. 
SYSTEMATIC DESCRIPTION OF THE CURTIS RANCH MAMMALIAN 
FAUNA 
Order CHIROPTERA 
SIMONYCTERIS STOCKI Stirton 
The anterior portion of a bat skull, Calif. Inst. Tech. Coll. No. 394, 
collected by the writer in 1928 at the Curtis ranch locality, was de- 
scribed by Stirton (1931) as a new vespertilionid, Simonycteris stock. 
Its characters were regarded by Stirton as closer to those of E'ptesicus 
than other genera of bats. 
18. H. Barbour and C. B. Schultz, Univ. Nebraska State Mus., vol. 2, No. 2, p. 24, 1939. 
