12 FOSSIL REPTILIA OF THE 



In the general osteological characters of the vertebral column we find this 

 genus agreeing with Hylaosaurus and Teleosaurus. 



None of the anterior vertebra? present the opisthocoelian modification cha- 

 racteristic of the Crocodilian genera Streptospondylus and Ceiiosaurus, and in a 

 minor degree of the Dinosaurian genera Megalosaurus and Iguanodon. 



Not any of the anterior dorsal vertebra? developes the spinous process of so dis- 

 proportionate a length as they present in the carnivorous Megalosaurus. Although 

 the neural arch becomes loftier than Crocodilia in the dorsal region of the spine, 

 the exterior of the peduncles or neurapophysial laminae does not present the 

 complex configuration produced by the strong, oblique ridges underpropping 

 the diapophysis in Iguanodon and Megalosaurus. Upon the whole, I find the 

 closest agreement to be between Scelido- and Hylaco-saurus in the characters of the 

 vertebral column ; and I infer for both, but especially for Scelidosaurus, a greater 

 aptitude for swimming than in the larger Dinosauria. 



Scapular Arch and Limb. Tabs. II and III. 



The scapular arch has been compressed transversely to a degree which has 

 produced fracture of the right coracoid (Tab. II, 52'), without material displace- 

 ment in its relations to the left (Tab. Ill, 52 and 52')* but with corresponding ap- 

 proximation of the two scapulae (Tabs. II and III, 51 and 51'), which have squeezed 

 together, with some fracture and more dislocation, the interposed parietes of the 

 thorax. The right scapula (Tab. II, 51) is least displaced ; it extends along the 

 first seven dorsal vertebras, overlapping the spines of the last two. It is long and 

 rather narrow ; thickest above the humeral articulation, narrowest at its middle 

 part, becoming broader and thicker towards its free end or dorsum, which 

 describes a moderate and regular convex curve. The length of the bone to the 

 fore part of its coracoid end is 13 inches; its least breadth is 2 inches; that of 

 the base is 4 inches 10 lines. The body of the scapula describes a slight con- 

 vexity outward in its course to the humeral joint, the expanded portion in front 

 of which is gently excavated for a triangular space 4 inches long ; the apex being 

 upward, with a well-defined boundary, indicative of the attachment of a muscle to 

 this part. The anterior border is almost straight through three fourths of its 

 extent from the base, then becomes slightly concave to the anteriorly produced 

 angle of the coracoid end. The posterior border is more deeply concave, through 

 the production of the thickened part of the bone to form the humeral articulation 

 (Tab. Ill, h). So much as is exposed of this surface is slightly concave transversely, 

 slightly undulating in the opposite direction, 2 inches in breadth. The articu- 

 lation (c) with the coracoid is a straight harmonia. At the upper part of the 



