0. C. Marsh—*Structure of Mosasauroid Reptiles. 468 
The remaining known species which clearly belong to the 
se Rhinosaurus are the following :—Rhinosaurus proriger, = 
acrosaurus (Inodon) proriger Cope; Rhinosaurus dyspelor, = 
Liodon dyspelor Cope; and Rhinosaurus Mudget, = Lnodon (Hol: 
codus) Mudgei Cope. 
_ - Kidestosaurus, Marsh. 
This Journal, vol. i, p. 447, June, 1871. 
United premaxillaries moderately developed, forming ante- 
riorly a short, obtusely pointed muzzle; iat posteriorly taper- 
ing gradually. Parietal foramen small. Palatines horizontal 
in front, but nearly vertical at posterior extremity. Palatine 
teeth more or less pleurodont. Quadrate small, with internal 
angle produced. Humerus very short and stout. Manus larger 
an pes. Femur slender. Vertchres with complete zygos- 
phenal articulation. Caudal extremity much elongated, and 
attenuated. Chevrons codssified with centra. 
Edestosaurus rex, sp. Nov. 
og sai arch is proximally lame os 
are slender. The pterotic bone is oval in transverse outline, 
have suffered somewhat from pressure, the femur east so. 
1d a more prominent anterior process. The femur is slender, 
With its shaft moderately constricted. It is peculiar in having 
the trochanter at the inner posterior angle. e dermal scutes, 
