248 Prof. H. G. Seeley on the Ornithosaurian Pelvis. 



the anterior side of the pubis, extend forward in a bow and 

 appear to be anchylosed mesially. The median part between 

 the two limbs of this bone measures T \ inch transversely and 

 the transverse measurement 

 between its extremities is l T 3 ,y Fig. 9 - 



inch. This therefore gives 

 the approximate width be- 

 tween the points of the pubis 

 with which this bone articu- 

 lated. The ischium and pubis 

 are rather thick bones, show 

 no trace of a dividing suture, 

 are directed somewhat back- 

 ward, and, as usual, are imper- 

 forate. There seems to be a 

 small foramen in the position 

 of the obturator foramen of 

 Cretaceous genera, and in 

 those genera the foramen lies 

 in the ischio-pubic suture." 



In another specimen, marked 

 11 Bh. Munsteri (GoW.), = Bh. 

 Gemmingi (v. Meyer)," the 

 sacrum appears to include 

 three or four vertebrae. The 

 ilium, which is blended with 

 the sacral ribs, is ly^- inch 

 long, and is prolonged for 

 about the same distance on 

 each side of the acetabulum. 

 The anterior process deepens 

 as it extends forward, and it is 

 about -,% inch longer than the 

 slender posterior process. A 

 minute obturator foramen 

 marks the union of the ischium 

 and pubis, which are directed 

 somewhat backward and 

 blended into a compact os 



innominatum. The pubis is thick and strong. The pre- 

 pubic bones appear blended into a bow-shaped bar. It 

 consists of a middle straight portion and right and left parts 

 which are inclined to it, though not quite symmetrical as 

 preserved. Each of these three parts would measure about 

 J| inch in length. The transverse measurement over the 



Rhamphorhynchus longimanus. 

 (Wagn. AM. Miinch. viii. T. xvi.) 



Fin. 10. 



Bh. Gemminyi. (Zittel, Pal. 

 xxix. T. xii. fig. 2.) 



