Jrom the Greensand of New Jersey. 895 
at Marlborough, Monmouth county, New Jersey. The species is 
named for Professor K. D. Cope, of Philadelphia, 
is an inch and five lines in length, and eight lines in antero-pos- 
terior diameter at the base. The facets fade away before reach- 
priately be named for the discoverer, Mr. John G. Meirs, who 
rescued for science so much valuable material relating to 
Mosasawrus and its contemporaries. 
Halisaurus* platyspondylus Marsh, gen. et sp. noy. 
Macrosaurus platyspondylus Marsh, American Association of Science, Salem Meeting, 
August, 1869, 
This genus is especially characterized by the great depression 
of the centra of the vertebrae, which gives the articular and 
cup a very transverse elliptical outline, exceeding in this respect 
apparently those of any other Reptilia. The vertebrae, so far as 
anterior three-fourths of the centrum, and the spine is of medium 
height. The neural canal is a broad vertical oval. The bg a 
uw 
* "Ae, the sea, and caipor, a lizard. 
Am, Jour. Sct.—Szconp Serres, Vou. XLVIL, No. 144.—Nov. 1869. 
ee 2 
