Cope.] ^£Al [April 15, 



Measurements of ilium. M. 



No. 1. No. 2. 

 Anteroposterior extent at articulations below. . . .065 .086 



Depth at pubis 036 



" " ischium 042 



Anteroposterior diameter acetabulum 035 .049 



Width above acetabulum 021 .034 



The ilium No. 2 may belong to a species distinct from No. 1, as it pos- 

 sesses an anteroposterior crest continued upward from the interior or 

 sacral face, and the external roof of the acetabulum is sloped downwards 

 exteriorly. The question of distortion prevents me from deciding the 

 meaning of these differences at present. 



The lyuhis is a very elongate bone, with a proximal extremity widely 

 dilated anteroposteriorly. The proximal end is fan-shaped, the expansion 

 from the axis being posterior. The proximal extremity is narrow, but is 

 widest anteriorly, and displays three surfaces. The anterior one is for 

 the ilium, the middle one is part of the acetabular border, and the poste- 

 rior and narrowest is for the ischium. The foramen for the internal fem- 

 oral artery is below the acetabular portion. The anterior border of the 

 pubis to the extremity is rib-like, while the posterior is laminiform. The 

 internal lamina is continued from the antero-internal face, and forms a con- 

 cavity with the postero-exterual. Its exact width is not determinable for 

 a good part of the length, for owing to its tenuity its edge is broken off. 

 The distal extremity does not appear to have been united to that of the 

 other side ; if it was it could only have been by the laminar edge. The 

 extremity is something like the head of a crocodile's humerus, the laminar 

 edge terminating in the usual position of a deltoid crest. The shaft of the 

 pubis is nearly straight. 



Measurements of pubis. M. 



Length of shaft (a small part wanting) 238 



.,^. . „ (anteroposterior 057 



Diameters proximally | ^^^^^^^^^^ ^^.^^^^^ 030 



^. ,. ^ „ (anteroposterior 023 



Diameters distally i , „,^ 



( transverse 012 



The iseliiam is less perfectly preserved, the head and the distal parts 



only remaining. The ischia form a long symphysis distally, but are not 



suturally united or coossified. The distal end is moderately expanded 



anteroposteriorly, and resembles in section a half ellipse. The proximal 



end has the iliac face a little concave, and the acetabular surface oblique 



to it, and more concave. The pubic contact is broken off. 



Measurements of ischium. M. 



Diameters proximally ] 



anteroposterior ? 



transverse 024 



Diameters distally | ^"teroposterior 030 



( transverse 014 



