180 



DINOSATJRIA. 



The type; figured by Owen in his 'Mesozoic Reptilia,' 

 pt. iii. pi. xxiii. and pi. xxiv. figs. 1-3. 



Gunnington Collection. Purchased, 1875. 



46321. Transverse section from the upper extremity of the pre- 

 (Fig.) ceding specimen. Figured by Owen, op. cit. pi. xxiv. 



fig. 4. Same history. 



46322. A similar dermal spine belonging to the same individual as 



the preceding ; from "Wootton-Bassetfc. Same history. 



Omosaurus (?), sp. 

 Hab. Europe (England). 



It. 584. A dermal spine, wanting the summit ; from the Oxford Clay 

 (Middle Jurassic) of Bedford. Yery similar in general type 

 to No. 46320. Presented by W. B. Graham. Esq., 1886. 



40517. The distal portion of a fibula not improbably belonging to 

 this or an allied form ; from the Oxford Clay of Weymouth, 

 Dorsetshire. This bone is solid throughout. 



Purchased, 1867. 



Family SCELIDOSAURIM]. 



Typically the cranium tapering anteriorly, with circular orbits 

 which are not prominent superiorly, and the infratemporal fossae 

 (and probably the nares) small; mandibular rami slender and 

 apering to a point, which may have had a predentary; teeth 

 (fig. 33) in a single row, with compressed, sharp- edged, triangular 

 crowns, of which the borders usually bear oblique serrations. 

 Yertebrse amphicoelous ; dorsals with slight depressions on the sides 

 of the centrum, narrow neural canal, and no deep pits on the 

 arches in front of the postzygapophyses ; sacral arches supported 

 by two centra ; anterior caudals with transverse diameter of cen- 

 trum longer than vertical; rib-facets of middle dorsal vertebras 

 typically forming a " step " on the transverse process, but in the 

 later forms placed on the arch. Limb-bones solid. Scapula with 

 large glenoid expansion, forming an obtuse angle with anterior 

 border of shaft ; coracoid with descending process ; humerus short, 

 with much expanded head, and shaft without angulation. Ilium 

 with long pre- and postacetabular processes, the latter being broad 

 and with an inner horizontal plate ; pubis and ischium compara- 

 tively short; femur with distinct inner trochanter, and slightly 



