182 KANSAS UNIVERSITY QUARTERLY. 
INCERTZ SEDIS. 
Baptosaurus Marsh. 
Upper Senonian of New Jersey (Upper Greensand). 
Upper Turonian of Kansas (Niobrara). 
Phosphorosaurus Dollo. 
Upper Senonian of Belgium (Brown Phosphatic Chalk of 
Cipley). 
TYLOSAURUS. 
? Macrosaurus Owen, Journ. Geol. Soc. Lond., 1859, 380. 
? Lesticodus Leidy, Proc. Amer. Phil. Soc., 1859, vii, ro. 
? WMectoportheus Cope, Proc. Amer. Phil. Soc., 1868, 181. 
Liodon Cope et alia, nec Owen. 
KRhinosaurus Marsh, Amer. Journ. Sci., June, ay NAOT os 1672 
(preoc. ). 
Rhamphosaurus Cope, Proc. Acad. Nat. Sci. Phil., 1872, 141 
(preoc.,). 
Tylosaurus Marsh, Amer. Journ. Sci., iv, 1872, 147. 
Moderate to very large sized species. Rostrum much produced, 
the nares situated far back. Facial surface of the parietal produced 
to the posterior part in the middle, the sides nearly parallel. Post- 
frontal and prefrontal meeting on the superior orbital border. 
Prefrontal not expanded on the facial plane over the orbit. Quad- 
rate with a short suprastapedial process. Humerus slender, the 
proximal end angular, the distal end without radial process. Ulna 
and radius slender. A single carpal or tarsal bone present, not 
articulating with adjacent bones. Phalanges very numerous, the 
fifth finger not reduced. Hind limb as large as the anterior. 
Spines of caudal vertebree not elongated. Thoracic vertebra twelve 
to fourteen in number, the lumbo-dorsals about ten, the pygal 
caudals five; whole number of vertebrae not exceeding one hundred 
and twenty; no zygosphene. Coracoid not emarginate. | 
As in Platecarpus the rightful name of this genus can not be de- | 
termined until more is known about the forms described from 
incomplete material from New Jersey. It seems very probable | 
that the name Z'y/osaurus will eventually have to be abandoned. 
It is altogether likely that Wectoportheus is the same, while JZac- 
rosaurus and Lesticodus possibly are. In this uncertainty Z7y/osaurus 
may be retained for the present. | 
Macrosaurus levis Owen, the type of the genus, was proposed 
_ for a species represented by two dorsal vertebrae from the Green- 
sand of New Jersey. Leidy (Cretaceous Reptilia, 75) referred ; 
other remains to the same species, but with the remark, ‘‘I cannot ' 
