CIMOLIASAURUS. 25 
at its root for an elastic ligament. The greater portion of a remaining posterior 
articular process indicates this to be of small size, and it has its facet directed down- 
ward and outward. 
The side of the body is extended into a large process excavated to its base into 
a vertical, ear-shaped, concave, costal pit, bounded by an elevated, acute margin. 
The vertical diameter of the pit is equal to two-thirds that of the body, and its 
transverse diameter equal to half the length of the latter. The upper extremity 
of the pit is formed by a trilateral process projecting outwardly from the root of 
the vertebral arch, and is separated from the rest of the pit by a deep, crescentoid, 
transverse fissure, remaining as part of the suture through which the arch is united 
with the body of the vertebra. 
The measurements of this vertebra are as follows :— 
Lines. 
Length of the body . : : ° . : : : < ° : vol 
Breadth of the articular extremities : . ( . ; : : - . 43 
Height of the articular extremities. . . . ‘ ; 7 2 . 33 
Breadth of costal pits . Z : é : ‘ 7 - : : : Sits 
Height of costal pits . é : ; : : ; 6 : : : PL 
Breadth of spinal canal. 3 : : 6 F : 5 : ¢ * Vil 
Height of spinal canal 2 , : ; : : : : : : = 12 
The carpal bone, represented in Figs. 13, 14, Plate IV, resembles those of Plesio- 
saurus. It isa thick hexahedral tablet, with the broad surfaces concave and rugged. 
The borders are half the width of the broad surfaces, and present parallel rows of 
nutritious foramina. The bone measures in its greater breadth thirty lines, in its 
lesser twenty lines, and its thickness ranges between twelve and sixteen lines. 
The metacarpal bones, represented in Figs. 15, 16, 17, likewise resemble those 
of Plesiosaurus. They are quadrilateral columnar bones, with the sides concave 
longitudinally. The extremities are quadrate in outline, and their surfaces exhibit 
parallel rows of nutritious foramina. 
The phalanx, represented in Fig. 18, also resembles those of Plesiosaurus. It 
is a slightly compressed Eide column, expanding from the middle towards 
both extremities. 
The carpal, metacarpal, and phalangeal bones indicate that they were articulated 
by cartilage, and together with the other bones of the extremity formed a paddle 
like those of Plesiosaurus. 
It is not jmprobable that I may have included, in the account of Discosaurus 
vetustus, the remains of more than one species, but the material at command 
appeared to me insufficient to justify a separation. 
CIMOLIASAURUS. 
Cimoliasaurus magnus. 
Cimoliasaurus magnus, Lery, Proc. Acad. Nat. Sci. Phila. 1851, 325; 1854, 72, pl. ii, figs. 4, 5, 6. 
Vertebre differing from any of those described in the preceding pages, and 
belonging to a huge Saurian, are frequently found in the Green-sand deposits of 
4 March, 1865. 
