XIII. 



STENEOSAURUS GRACILIS. 



385 



Length of head, if complete, probably 30-0 inches ; maximum 

 breadth across parietal region, 8'O ; across frontals, in front of the 

 eye, 6-0. 



Surface of bone rather smooth. Projection in front of orbit nearly 

 horizontal, with oval outline, protecting foramina which, in place, 

 correspond to the nares of enaliosaurs. A narrow parietal ridge 

 between oval temporal fossae. 



Occipital surface pentagonal, nearly vertical, much as in crocodile, 

 but the basi-occipital wider, undulated, perforated for blood-vessels, 

 joined by synostosis to the os quadratum, the articular edge of which 



Diagram CLXXXVIII. Steneosaurus gracilis. 



i. View of the occipital surface, shewing the foramina in the basi-occipital bone. 

 c. The condyles. (This drawing is made to correspond in size with the view in 

 Diagram XLVI. p. 189.) 2. The head, seen from above. Scale one-tenth of 

 nature, c. Condyles. /. The frontal. /. Anterior frontal, n. Nasal bones, accord- 

 ing to the nomenclature of Cuvier. g. The prseorbital groove. 



is more oblique than in crocodiles. The basi-occipital prominence 

 has no vertical furrow, but a slight mark of central depression. 

 Lateral and supra- occipitals present a concave surface, the laterals 

 ending in a distinct prominence above the tympanic bone. 



c c 



