wo. 1627. TWO NEW PLEISTOCENE RUMINANTS—GIDLEY. 683 
marked in the following characters: The modifications at the base 
of the horn-cores, the small size of the otic bulla, the enlargement of 
the posterior narial opening and the spheno-palatine foramen, and 
the broad proportions of the basioccipital. 
Table of Measurements, 
O. YU- | mos-| §. tyr- 
konen-| chatus.| relli. 
Sis. 
mm. | mm.* | mm.4 
Length of molar-premolar series__------------------------------------------- | 145 | 135 168 
Anteroposterior diameter of m?______--__--__-__---------------+_---1---------. 30 31.5 35 
Anteroposteriomdiametemot mshos2— 25-2 ee | 36 33 49 
Mbransverse.diametercOnem 92-22. 22 2 ee ee ee ee 23 19 32 
TRAN SVeLrsesGiamMe tercOwey ss ee etn ee aed eee ere ey ee IN sR eS 22 18 33 
Anteroposterior diameter ol horn-corerat | bases=ss === a2 ee | 198 | 138 , 95 
Vertical diameter of horn-core at base______.----__-_------------------------ | 60 68 72 
Length of horn-ecore, outside (approximated)__-___________-_____--___-___--_ 230) eS cote) |2 cet 
Anteroposterior diameter of orbit_-_-_----__-----------------__--------- see 68 63 73 
WiidthvotstaceLacroSsHOn bits aes oe ete Si aries Seen eee ea 250 | 232 Teil 
\wvitchiln @it SAWIll GYOROSS TIA SHONOKL =o te es ee eee SSS SSE | 190 | 180 197 
Dep CL ROLE OCCID Uae a tere ee eae Ue nn een Me yaa hemes ee eS | 119 | 123 117 
Greatest width of basioccipitala=_ 22 = 22-8 = ee 70 64 72 
Inferior lip of foramen magnum to anterior border of palatine notch____ 194 | 177 184 
Inferior lip of foramen magnum to alveolus of m3_______-__-_--___-__-_____- 244 | 217 218 
AVAL GLUES OTP a DCO a 170 ee es ea ec as ie TE eS 80 79 84 
@ These measurements are taken from a table published by Osgood. Smithsonian Miscell. 
Coll., XLVIII,, Pt. 2, July 1, 1905, p. 184. 
BOOTHERIUM SARGENTI, new species. 
Plate LIX. 
Type.—The upper portion of a skull, supporting the complete horn- 
cores, now deposited in the Kent Scientific Museum of Grand Rapids, 
Michigan. 
Ty pe-locality. Nicorand Swamp, on the Charles McKay farm, 
near Grand Rapids, Michigan. 
[orizon.—Pleistocene, post-glacial. 
Species-characters.—Size about two-thirds that of Ovibos moscha- 
tus, somewhat larger than B. bombifrons,; horn-cores comparatively 
large, well rounded, long and slender; horn-cores at base horizontally 
directed at right angles to the skull as in Plate LIX, fig. a, but 
curving downward and forward in graceful semi-spirals, ending in 
slender anteriorly directed tips (see Plate LIX, fig. 6); orbits 
comparatively large, depressed below the arching Geomtals with thin 
gently shelving borders, not tubular as in Ovibos. In ue general 
form and contour of the skull and horn-cores this species, together 
with B. bombifrons, is strikingly different from other known species 
of the Ovibovene. 
The type of B. sargenti, compared with that of B. bombifrons, 
shows the following resemblances: (1) The fragment preserved: in- 
dicates a skull but httle larger in size and of the same general propor- 
tions; (2) the position, form, and contour of the orbits as well as (3) 
the general appearance of the facial and posterior portions of the 
cranium (see Plate LIX, fig. ¢) are essentially alike. The horn- 
cores are also similarly placed, but the differences in their relative size, 
form and proportions are very marked. In B. sargenti the base of the 
