322 NEWLY DISCOVERED FOSSIL REPTILE 
the corresponding one of the coracoid, forms the 
cavity for the reception of the head of the humerus. 
There are no clavicles ; the coracoid alone forming 
a buttress against the sternum. 
In the fossil before us, the omoplates (of which 
restored outlines are given in p. 3S1. fig. 6, 0.) cor- 
respond in many particulars with those of the cro- 
codile above described, and unite with the coracoid 
in a similar manner. The head of the bone is 6 
inches wide, and very thick ; it is contracted at the 
neck, and passes off into a flat and wide extremity: 
the articular facet is 2\ inches high, and 3^ wide. 
These bones are about twelve times larger than 
the omoplates of a crocodile 3 feet long (they 
are marked /’^/’in Plate V.). The coracoid hones 
{c Cy fig. 6. p. 321. and Plate V. g g) are totally 
distinct from those of the crocodile ; they are like 
the coracoids of the true lizard, hatched-shaped ; 
but they are not emarginated, and have no apo- 
physes corresponding to those of the recent Monitors 
(fig, 1.) and Iguanas, and the fossil Megalosaurus 
(fig. 4.). The longest diameter of the coracoid is 
7 inches ; the transverse diameter 5*1 inch : it pre- 
sents a large articular fossa for the glenoid cavity, 
which is formed mutually by this bone and the 
omoplate. Near the neck of the bone is a large 
foramen for the passage of vessels, which invariably 
is the case in the lizards, but does not occur in the 
Plesiosaurus, Ichthyosaurus (fig. 2.')*, Megalosau- 
* Tlie only known exception is a coracoid of an Ichthyosaurus, of 
which a reduced sketch is given fig. .3. p.32L: here the humeral extremity 
is seen to throw off a kind of apophysis, which unites at the upper end 
of the glenoid cavity, and thus produces a foramen at a. This in- 
teresting specimen was in the matchless collection of Ichthyosauri ami 
