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



and completed symmetrically, it will be found that their 

 expansions extend laterally far beyond the ilium, showing 

 that they were inclined to each other. Their stalk articular 

 ends might be in contact with the proximal ends of the 

 pubes so far as this specimen is concerned. Specimens which 

 expose the ventral surface of the pelvis have the prepubic 

 bones often parallel to each other and their stalks separated 

 by a width which would not be less than that between the 

 pubic bones. This may be seen in Qaenstedt's figure of {Pt.) 

 Ci/cnorhamj^hus suevicus (' Ueber Pterodactylus suevicus &c.,' 

 Tubingen, 1855) and in Fraas's figure of Rhamphorhynchus 

 suevicus (Jahreshefte Vereins vaterl. Natur. Wiirttem. xi. 

 T. ii. 1855); and, on the whole, specimens which show a 

 lateral aspect of the pelvis commonly have the stalk of the 

 bone in a superior position, though exceptions occur, as in the 

 type of Pterodactylus longirostris, in which the bone is dis- 

 placed ventrally. 



An instructive lateral aspect of the pelvis is seen in the 

 Stuttgart specimen, no. 5802, from the Lithographic Slate of 

 Nusplin.gen (fig. 3), which is figured by Fraas in the'Palseon- 

 tograpliica ' (N. F. v. 4 (xxv.), T. xxii.) && Pterodactylus 

 suevicus of Quenstedt. A cursory examination shows it not 



Fiff. 3. 



Pelvis of Cycnorhamphus Fraasii (posterior angle of ischium restored). 



to belong to that species, even if it belongs to the same genus, 

 for the prepubic bones are of dissimilar forms and proportions 

 to those of Cycnorliamphus suevicus. It moreover has the 

 acetabulum much larger. The humerus, ulna, and radius, 

 femur, tibia, and fibula are all relatively longer in the Stutt- 

 gart specimen, without a corresponding elongation of the wing 

 phalanges ; and therefore I shall speak of this specimen as 



