322 Prof. H. G. Seeley on Euskelesaurus Brownil. 



the ilium ; but the posterior half is somewhat concavely exca- 

 vated, as though it had contributed to the acetabulum. 



The surface which appears to be the articulation for the 

 ischium is remarkably strong and irregularly four-sided, 2^ 

 inches deep, and wider above than below. It shows a carti- 

 laginous surface, and may possibly have been connected with 

 the ischium by a cartilage. 



The pubes appear to have been directed downward and 

 forward, and, as j\l. Fischer has stated, to have met in the 

 median line ; for at the transverse distal extremity along the 

 inner margin an oblique articular surface extends over the 

 bone, about an inch deep in the middle and rather narrower 

 towards the inner and outer borders. 



Fior. 2. 



Ischiac surface. 



Obturator notch. 



External aspect of proximal end of left pubic bone of Euskelesaurus 

 Broxaiii. -yV "^t. size. 



The pubis is constructed on the same plan as that of 

 Mossospondylus^ but differs in having the obturator foramen 

 or notch relatively smaller. The formation of the backwardly 

 directed process above the obturator foramen is very similar 

 in the pubes oi Zanclodon, figured as sternum by Plieninger 

 (Jahreshefte, Wlirtt. 1857, t. xi. fig. 1), in which the bone 

 appears to retain the width of the plate from the distal end 

 upward to the obturator notch. But in the Tiibingen speci- 

 men, which I have referred to as Teratosaurus Quenstedti^ 

 there is no such development of a subacetabular process, and 

 the acetabular notch is much larger. In Staganolepis the bone 

 is apparently similar at the proximal end so far as the sub- 

 acetabular process is concerned ; but these are the only genera 

 known in which the pubis has a similarly expanded blade 

 and a hook-like proximal end. 



I have no knowledge of the ischium or ilium. 



Vertebral Column. 

 The only vertebras of Euskelesaurus hitherto known are 



