392 0. C. Marsh on new Mosasauroid Reptiles 
Art. XXXIX.—WNotice of some new Mosasauroid Reptiles from | 
the Greensand of New Jersey; by O. C. Mars, Professor of 
Paleontology in Yale College. 
STRIKING difference between the reptilian fauna of the 
Cretaceous of Hurope and America is the prevalence in the © 
former of remains of [chthyosaurus and Plesiosaurus, which here — 
appear to be entirely wanting; while the Mosasauroids, a group — 
disclosed affinities with other groups, before unsuspected. The — 
interesting remains of A/osasaurus and its allies, which are baery 
characterized in the present paper, promise to throw much ad- 
ditional light on this subject, and will be described in full, with — 
illustrations, at an early day. 
Mosasaurus princeps Marsh, sp. nov. 4 
This species is indicated by the most important parts of askel- — 
eton which is perhaps the largest hitherto found in this country, — 
below, and tbe 
