332 PROF. ST. GEORGE MIVAET ON THE 



Dorsally viewed (Plate LIX. fig. 1), the ilia are not relatively so transversely expanded 

 preaxiad as in any of the Struthionidse, and the lateral preacetabular margins of the ilia 

 are not so concave. 



The antitrochanteric process (at] is situated just preaxiad of the antero-posterior middle 

 of the pelvis. It stands out a little less sharply than in any of the Struthionidse, 

 because the lateral margin of the pelvis postaxiad of it is not so concave as it is in all 

 that family. 



The postacetahular part (il 1 ) is much broader than in any of the Struthionidae. It is 

 widely flattened dorsally, with a median antero-posterior ridge, and a series of foramina 

 on each side of it. 



The outline of the postaxial end of the pelvis differs widely from that of any of the 

 Struthionidae. Its general outline is deeply concave. Moreover the postaxial margin 

 of the ischium (which forms part of the general postaxial outline) is also deeply concave, 

 and therefore unlike that of any of the Struthionida3. 



The pubis extends postaxiad more than in any genus of the last-named family which 

 has not got a pubic symphysis. 



The greatest transverse diameter of the pelvis is between almost the hindermost parts 

 of the ischia. 



The transverse diameter between the trochanteric processes widely exceeds that of 

 any more preaxiad part of the pelvis, in which respect it differs from the pelvis of any 

 existing Struthious bird. 



Ventrally viewed (Plate LIX. fig. 3), the pelvis of Pelecanus differs strikingly from 

 those of all the living Struthionidse in the relatively great and absolutely predominating 

 width of its postacetabular part, also in the conspicuous lateral acetabular or renal fossae 

 on each side, mesiad of the acetabulum (f). 



In these two points it agrees with Dinornis, though even in Dinornis the renal fossa3 

 are much smaller, relatively, than in Pelecanus, and are subcrescentic in form (each 

 crescent being convex mesiad), while in Pelecanus each fossa is subquadrate in shape, by 

 which it differs absolutely from all the Struthionidse. It also differs from them in that 

 there is a deep, though small, fossa (the supraacetabular fossa) on the ventral surface 

 of each ilium, just external to the expanded conjoined ends of the parapophyses of the 

 sacral vertebrse (fig. ?>,/'); only the innermost part of it is to be seen in a direct 

 ventral view. This fossa deepens at its preaxial end, and terminates preaxially by a 

 foramen which leads into a distinct fossa on the ventral surface of the postaxial 

 external part of the roof of the acetabulum. This supraacetabular fossa is marked off 

 by a strong ridge on its internal side. 



By the presence of these fossae and foramina Pelecanus differs from all the 

 Struthionidse. 



The ventral surface of the vertebral part of the pelvis is widest at the last lumbar 

 vertebra, then slowly contracts postaxiad to the third caudal. 



