March 38, 1871.] 41 [Cope. 
SUPPLEMENT to the ‘“‘ Synopsis of the Extinct Batrachia and Reptilia of 
North America.” 
By E. D. Corz. 
(Read before the American Philosophical Society, March 8, 1871.) 
BATRACHIA. 
SAUROPLEURA REMEX, Cope. 
Proc. Acad. Nat. Sci., Phila. 1868, p. 217. 0. amphiunimus, Cope.. 
Trans. Am. Phil, Soc. 1869, 17 in parts. 
A fine specimen of this species recently sent me by Prof. Newberry, 
from Linton, Ohio, includes the vertebral column from the hind limbs to 
the end of the caudal series. One of the former is preserved and exhibits 
slender digits and other characters like those already described in the S. 
pectinata, Having ascertained that the Oestocephalus amphiuminus pos- 
sesses no anterior limbs, I regard my reference of these species to that 
genus as premature, and will allow them to remain in Sawropleura, 
where I originally placed them. 
OESTOCEPHALUS AMPHIUMINUS, Cope. 
Trans. Amer. Phil. Soc. 1869, p. 17; 1. ¢. p. ii. 
The bones formerly regarded by me as referable to a nadinientel fore 
limb in this genus, appear to be rather branchihyals, and indicate the ex-- 
istence of external branchie. 
COLOSTEUS SCUTELLATUS, Newb. 
Pygopterus scutellatus, Newberry, Proceed. Ac. Nat. Sci., Phil. 1856. 
Colosteus crassiscutatus, Trans. Amer. Phil. Soc. 1869, 238. 
The original description of this species by Prof. Newberry was over- 
looked, in preparing my account of it above quoted. 
MOSASAURID &. 
Liopon sEcToRIUS, Cope, sp. nov. 
Established on a large part of the under and upper jaw, and other parts 
of the cranium with a vertebra, from the green sand of the mapper bed of 
the Cretaceous of New Jersey. 
The character which at once distinguishes this species from other 
Liodons, and especially from all the species of Mosusaurus, is the very 
compressed form of the crowns of the teeth, which approach nearer in 
this respect to those of Diplotomodon, than any others that I have seen. 
The vertebra, a lumbar, has also subround articular faces, thus removing 
the species from close relationship to those with depressed vertebra, of 
some of which the teeth are unknown. 
In the present specimen crowns and pedestals of thirteen teeth are pre- 
served. Those of the mandible are most numerous, and display the suc- 
cessional modification of form from before backwards visible in other 
species of the family. The anterior teeth are less compressed, and have 
A. P. 8. —VOL XII—F 
