84 O. C Marsh— New Characters of Mosasauroid Reptiles. 
In the other anes of Mosasauroid reptiles, the sternum has 
not yet been found so well preserved as in Hdestosaurus, but 
there can be no mere Wh doubt of its presence. In Holosaurus 
there appears to have been a partially ossified mesosternum. 
Toe FoRE-LIMBS. 
In Plate I, figure 1, the entire pectoral = and paddles of 
Edestosaurus are represented, essentially as found in the matrix. 
Hitherto, the limbs of this genus have ane only partially 
known. ‘The general structure of the paddle is Cetacean in 
type. The humerus is very short, and the radius is larger than 
the ulna. There are seven distinct carpal bones, The outer 
agi The after thas x reds determined aa figured the 
THE ae 
Since the writer discovered the posterior limbs in several 
aie of the Mosasauroids, and figured the pelvic arches, little 
as been added to the subject. In Plate I, figure 3, the com- 
plete pelvic arch and hind paddles of Lestosaurus are repre- 
sented, the latter nearly in the position in which they were 
found. They are considerably smaller than the ierepalidies but 
very similar in general form an yi aad has The femur is 
more slender than the humerus, and there are but three tarsal 
bones, all on the outer or fibular side. There are five well 
developed digits, fae number and position of the phalanges 
are shown in the fi 
In Tylosaurus i. ene paddles are smaller than those in 
front, but their structure is very similar. All the genera of 
the Mosasauroid — have a well developed pelvic areh, an 
functional posterior limbs. 
Tur Hyow Bonss. 
No hyoid bones have hitherto been observed in this grouy 
but they exist in Tylosawrus and Lestosaurus, and doubtle 
all the genera. A pair of these bones was found betel! ‘ 
* This Journal, vol. iii, Plate X. 
