172 NOTE ON A FOSSIL CROCODILE FROM CHICKERELL. 



crocodilian nature of the animal ; while they further suggested 

 its reference to the Jurassic genus Steneosaurus rather than 

 to the contemporary Afetriorhynchus, in which these structures 

 are undeveloped. And this reference is confirmed by the 

 character of the right ilium (fig. 2), which is one of the most 



FIG. 2. IMPERFECT KIGHT ILIUM OF STENEOSAURUS 

 FROM CHICKERELL. 



characteristic bones in this group of crocodiles. With the 

 exception of the pre-acetabular process (restored in the figure) 

 and the tip of the posterior extremity, the bone is complete. 

 And it will be found to agree in all respects with the specimen 

 of the same bone of the opposite side of a Steneosaurus from the 

 Oxford clay of Peterborough figured by the late Mr. J. W. Hulke 

 in the Proc. Zool. Soc. for, 1888, plate xix., figs. 3 and 4. In 

 figures i and 2 of the same plate is shown the corresponding 

 bone of Metriorhynchus, which will be seen to be of a shorter, 

 narrower, and taller form than that of Steneosaurus, with the 

 pre-acetabular process projecting in front of the anterior border 

 which is straight, instead of convex. So far indeed as I can 

 see, no specific difference can be detected between the North- 

 amptonshire and Dorsetshire specimens. But as Mr. Hulke does 

 not consider it advisable to attempt the specific determination of 

 the former, and seeing also that the fine series of Peterborough 



