52 FIELD CoLUMBIAN MusEUM—GEOLOoGy, VOL. II. 
fore limb, is impossible to say—the only differences that could be 
detected are the rather hghter weight or greater slenderness of those 
located here. Their relations to each other are precisely those of the 
fore hmb. It seems probable that the fourth bone on the posterior’ - 
side of the first row, articulating with the femur, was wanting in life, 
or at least was very small—none were preserved. The fore and hind 
limbs, as restored, are of the same length. All four paddles were 
restored as completely as those shown in the figures. 

CIMOLIASAURUS SNOWII. 
SkutL.—The skull of this species was briefly described by me in 
the Transactions of the Kansas Academy of Science tor 1890, to which 
some additional observations were made by Cope in the Proceédings 
of the American Philosophical Society for 1894, p. 10g. I give here 
a more complete comparative description, in the light of the infor- 
mation furnished by other known forms, especially Dolichorhynchops. 
pe 
ms ly fe Ce: im | . 
QAMvaQ 
FiG.13. 5 
. e 
Skull of Czmolizasaurus snowii Will. Pm. premaxilla; e., external naris; #x., maxilla; Af, 
prefrontal; fof, postfronto orbital; 7., jugal; sg., squamosal; f#a., parietal; so., supraoccipital; ¢o., 
exoccipital; g., quadrate; g7. quadratojugal; d@, dentary; swr., surangular; ag., angular. 
The parietals form a: steep, roof-like covering, ascending into a 
thin, sharp, sagittal crest, extending through nearly their whole 
length, from the attachment of the squamosals posteriorly as far for- 
ward as the posterior part of the orbit. This crest, throughout most 
of its extent, forms a thin, vertical plate, with nearly parallel sides 
