1893.] Geology and Paleontology. . 661 
B. Conules of upper cheek teeth much reduced, and external cusps 
deeply concave; posterior transverse crest confluent with outer 
wall; anterior pillar of lower teeth reduced and on one or more 
teeth absent. No cement; incisors with pits. Anchitherium. 
II. Teeth hypsodont. 
1. Antero-internal cusp of upper teeth confluent with transverse 
crest Protohippus Leidy. 
2. Jdféso-Interan] cusp separate from transverse crest. 
Hipparion de Christol. 
Desmatippus gen. nov.—Molars and premolars short crowned, the 
valleys more or less filled with a thin deposit of cement. In the upper 
series the posterior transverse crest is connected with the outer walls 
and sends forward a process which extends nearly to the anterior 
conule. Inner cusps of lower teeth expanded so as to narrow entrances 
to the valleys. Median inner cusps (a, a’ of Riitimeyer) much more dis- 
tinctly separated than in the older genera. 
D. erenidens sp. nov.—Posterior transverse crests of upper cheek 
teeth sinuous; limbs elongate and slender ; size moderate. 
This interesting new equine very satisfactorily fills the gap between 
Miohippus and Protohippus. The type specimen was found by I. 
Benet in the upper strata of the Deep River. : 
Anchitherium equinum sp. nov.—Size equal to that of A. aurelianense, 
but with teeth relatively larger; lower incisors without enamel n 
humerus with bicipital tubercle and double bicipital groove. 
This is the first American species of Anchitherium in the Sedi 
sense in which that name is here employed. It was found by Mr. 
Benet in the upper beds. 
Mesoreodon gen. nov.—Skull and zem very much as in the John 
Day genus Eporeodon but with * adaptive” names, the 3d metacarpal 
articulating with the trapezoid and dei the 2d from the magnum. 
M. chelonyx sp. nov.—Metapodials rather short and stout, ungual 
phalanges trowel-shaped and pointed. 
This is the most abundant animal of the lower beds, and nearly all 
parts of the skeleton are known. Two very curious features are the 
presence of a rudimentary clavicle and of an ossified thyroid cartilage 
-of the larynx." The type was found by O. C. Mortson. 
M. intermedius.—Metapodials slender and elongate, and ungual 
phalanges like those of Merychyus. Lower beds. 
Cyclopidius incisivus sp. nov.—Like C. simus, but having two small 
incisors in each premaxillary; the latter bones also of a different 
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