STENEOSAILRUS. 



Ill 



lower part of the acetabulum (acet.). There is also a smaller roughened surface 

 looking nearly directly upwards for union with the ilium, and corresponding in form 

 with the ischial facet of that bone. The anterior face of the posterior portion is flat 

 or concave. The small anterior branch or pubic process (a.p.i.) is directed upwards and 

 forwards ; its posterior face is concave in all directions, the anterior convex. At its 

 extremity this process bears a triangular facet for union with the surface on the 

 anterior part of the ilium (PL VII. figs. 7, 7 a, il.s.) to which reference has been made 

 above. At the end of the process and connected with the surface for the ilium, and 

 nearly at right angles with it, is a small facet for union with the upper end of the 



Text-fig. 44. 





SQC.SJ. 



Inner side of the left half of the pelvic girdle of Steneosaurus leedsi. (R. 3SU6, 4 nat. size.) 



a.a., anterior angle of ilium ; a.p.i., anterior process of ischium ; il., ilium ; is., ischium ; pu., puhis ; 

 sacs. 1 & sacs. 2, surfaces for union with the first and second sacral ribs ; sym., symphysis. 



pubis (pu.s.) ; there is no trace of a facet for that bone on the ventral face of 

 the process, such as is found in the recent Crocodiles, and it seems impossible that the 

 pubis articulated only with the ischium, as it does in them. 



The pubis (pu., PL VII. fig. 8 ; text-figs. 43-44), compared with the ischium, is a 

 slender bone : at its lower end it is expanded into a spatulate blade, the ventral convex 

 edge of which was fringed with cartilage and is directed towards the middle line, bur. 

 it is not clear whether it reached its fellow on the opposite side. Above the distal 

 expansion the bone narrows to a slender neck, oval in section, while at the upper end 



