KANSAS UNIVERSITY QUARTERLY I 
i MOT WT, TU LY, 1897. NO. <3, 
Restoration of Kansas Mosasaurs, i 
BY. Sa We WILLISTON. 
With Plate XTII. 
In the present communication are given restorations of the three 
Principal genera of Kansas Mosasaurs, based upon the material 
how in the University of Kansas Museum. A detailed description 
of this material is now in preparation to be shortly published 1] 
aS a volume of the University Geological Survey, of which Chan | 
Cellor Snow is Director. At present only the more striking char- } 
acters of the three forms will be discussed. I 
The three genera herewith given comprise all the authentic types 
known from Kansas. In addition, Molosaurus Marsh, Szronectes || 
Cope and Baptosaurus Marsh, have been described from or accred- 
ited to the Cretaceous of the state. Svronectes, is, I believe, a 
Synonym of Platecarpus. It was based upon the presence of the 
4Ygosphene in connection with free chevrons. In P/atecarpus there 
1S, 1n most species, a rudimentary zygosphene, and in some it is 
| Nearly as large as in some species of C¥idastes. It is possible that (| 
olosaurus isa good genus, but specimens of it must be exceed- 
ingly rare, The type specimen, now in the Yale Museum, was 
Collected by myself and represents nearly the complete skeleton. | 
Baptosaurus is practically known only from the posterior part of 
the jaw, described by Merriam. This is very peculiar in having 
nie articular bone reflected upwards at the extremity. | 
The material upon which the restorations here given are based 
'S as follows: CVZidastes is restored from a single specimen, complete 
In al] details, save the terminal phalanges of the front paddle and 
MOst of those of the hind paddles. The present restoration differs 
(107) KAN. UNLV. QUAR., VOL, VI. NO. 8, JULY, 1897, SERTHS A 
