SKELETON OF PHORORHACOS INFLATUS. 77 
former paper !, that Cariama is probably a not very remote modern representative of the 
extinct type. 
From the Birds of Prey the chief points of difference are, that in them the post- 
acetabular region is very short and is deflected, and there is no ilio-caudal process to 
the ilium. In Serpentarius, however, the first two of these characters are much less 
marked, and in this respect, therefore, it approaches the fossil, these characters being 
probably merely correlated with the fact that it is a much better walker than the other 
Accipitrine birds. 
In the Storks the pre-acetabular portions of the ilia meet at a very obtuse angle, 
the postacetabular region is very wide, and there are no recesses to the post-renal fossz. 
In the Herons these fossz, though present in some, are small, the ilio-neural canals 
are widely open behind, and the pelvic escutcheon is wide; certain Galliformes, 
e. g. Phasianus and Francolinus, in which renal pockets are present, differ from the 
fossil in much the same respect. 
In the account of the skull some points of similarity with that of the Albatross were 
referred to, but in the pelvis no similarity whatever can be detected. Among the more 
notable differences may be mentioned the complete absence of pocket-like extensions of 
the renal fosse, almost complete absence of supra-trochanteric processes, the backward 
prolongation of the ischia and their mode of union with the ilia, and the indistinctness 
of the true sacral vertebre. 
Ameghino, in his manuscript catalogue, distinctly states that this pelvis and other 
bones were found associated with the skull above described, and formed part of one 
individual; and if this is the case, as there is no reason to doubt, the structure of 
the pelvis seems completely to outweigh whatever evidence of relationship with the 
Albatrosses may be found in the skull. 
The dimensions of the pelvis are :—~ 
cm. 
ibxtremellengthiweme in cs eee eeMaicte tone ten rel on nto Renee 41°5 
Length of ilium . . PR ah see oe thease 41°0 
Longitudinal diameter of ischiadi¢ foramen:2 if ose) CVs. gakiet <8 
Vertical diameter of ischiadic foramen . . . »- - + + © © *+ * * 37 
Length of obturator foramen. . . «+ + + = SOG bd eB Nee. 
Greatest height from hemal ridge of sacrum to top of iliac ee ae iy olaL 
Width at anti-trochanters . - . . © «© «© «© «© « »© © *© # ® ® 11:2 
», at supra-trochanteric crests) - - . + + 2 = « = 5 © ss 10°6 
» between upper edges of acetabula . | . + + + s+ + + 5 + 45 
» (least) behind supra-trochanteric crests . . + + + + * + * 63 
»» (least) pre-acetabular region - - - © . + + + + * 8 3°5 
» centrum of first fused “ sacral i vertebrars ae ames 3) B28 
Tengtly of synsacrutt oes) td) agent yes a ah) 36°5 
‘The Ibis,’ 1896, p. 1; see also ‘Science Progress,’ yol. y. (1896) p. 398. 
