388 



THE PORTLAND OOLITE PERIOD. 



CHAP. 



One anterior dorsal has occurred, carinated beneath ; the body 

 higher than broad; concave on both faces, most concave behind. 

 The upper transverse process runs out from above the suture to 

 about three-fourths of the breadth of the vertebra ; its direction is 

 downward and a little backward. The parapophysis rises free from 

 near the anterior edge ; it is depressed with an oval section. 



Interval between the rib articulations, ro inch ; length of the 

 vertebra, 1*5 ; height of the same, 1-45 ; breadth of the same, 1*25. 



STENEOSAURUS LONGIROSTEIS. Cwo. 

 Among other saurian remains of interest found in the Kimmeridge 

 clay are jaws and teeth which seem to be of the same kind as the 

 long-beaked gavial of Honfleur, described by Cuvier. A specimen 

 in the Oxford Museum shews a portion of the lower jaw, with 

 teeth in situ, one of which is represented in the Diagram below. 



Diagram CXC. Steneosaurus longirostris. 



The tooth here represented on its exterior face is of the usual size along the sides 

 of the jaw. Two distinct carinse appear, toward which, in a slight degree, the 

 minute rugulosities of the surface converge. On the concave part of the surface these 

 become fine distinct undulated strise. 6. The base widens much and becomes hollow, 

 indicating the mode of replacement to have been axial, as in crocodiles. The cross 

 section shews the carinse to separate rather unequal portions of the tooth, a. Dentine 

 close, firm, and dark. Enamel thin. 



The portion of jaw referred to is the symphysial part, and seems 

 nearly complete at the anterior end. It is 20 inches long ; the 

 breadth is 3^. Thirteen teeth on one side, fourteen on the other. 



