96 KANSAS UNIVERSITY QUARTERLY. 
Brachysaurus, ven. nov. 
Frontal bone as broad or broader than long, the orbital margins 
not at all emarginate, the posterior portion projecting in the middle 
and emarginate for the pineal foramen. Maxilla very stout, with 
twelve teeth. Mandibles stout, with fourteen teeth. Teeth very 
stout, moderately recurved, wholly smooth, without facets, and 
with an anterior and posterior carina. Supracolumellar process of 
quadrate long and stout, and broadly co-ossified with the body of 
the bone below, enclosing a large, oval, auditory meatus, above 
which is situated the large stapedial pit. Zygosphene of vertebre 
rudimentary or wanting; chevrons co-ossified with centra; hypo- 
pophyses of cervical vertebre free; cervical and dorsal vertebra 
cordate in outline; pygial and caudal vertebre subtriangular. 
Humerus very stout and broad; radial process wanting, the ulnar 
process stout. 
In the absence of other parts of the skeleton, it is not possible to 
say with certainty to which family the genus belongs. The 'co- 
ossified chevrons have hitherto been characteristic of the Mosa- 
sauride, but the absence of the zygosphene points more to the 
Tylosauride. 
Brachysaurus overtoni Williston, Kans. Univ. Quart., iii, 169, 1895. 
The quadrate bone has some of the general characteristics of 
Mosasaurus horridus, but the supracolumellar process is much 
stouter and longer, and is firmly co-ossified below, a unique char- 
acter among the American forms. The stapedial pit, of large size, 
is situated below an overhanging ridge, and is much higher up 
than in the forms used for comparison (Mosasaurus, Platecarpus, 
Clidastes and Tylosaurus). The wing is apparently thin, and is 
preserved only in part; it does not seem to be of large size. Alans 
external auditory cavity is much less expanded than in the other 
genera, not extending nearly to the inferior margin of the bone. 
It may not be amiss to state here that this cavity in the Kansas 
specimens of the order is frequently filled with thick plates of car- 
tilage, which extend through the auditory slit or foramen and sur- 
round the stapedial pit to a greater or less degree. The maxillary 
articulation is elongate, and broader on the outer part. 
The mandibles are remarkably stout, and have not more than 
fourteen teeth implanted inthem. I formerly erroneously gave the 
number as thirteen. The jaws are distinctly convex along their 
under border and somewhat concave above. The coronary bone is 
stout, but apparently does not extend as high as in Mosasaurus and 
