332 PROF. ST. GEORGE MIVART ON THE 
Dorsally viewed (Plate LIX. fig. 1), the ilia are not relatively so transversely expanded 
preaxiad as in any of the Struthionide, and the lateral preacetabular margins of the ilia 
are not so concave. 
The antitrochanteric process (af) is situated just preaxiad of the antero-posterior middle 
of the pelvis. It stands out a little less sharply than in any of the Struthionide, 
because the lateral margin of the pelvis postaxiad of it is not so concave as it is in all 
that family. 
The postacetabular part (‘J’) is much broader than in any of the Struthionide. 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 
Struthionide. 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 Struthionide. 
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 Struthionide in the relatively great and absolutely predominating 
width of its postacetabular part, also in the conspicuous lateral acetabular or renal fosse 
on each side, mesiad of the acetabulum (/). 
In these two points it agrees with Dinornis, though even in Dinornis the renal fosse 
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 Struthionide. 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 vertebre (fig. 3, f’); 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 fossee and foramina Pelecanus differs from all the 
Struthionide. 
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. 
