O. C. Marsh—American Jurassic Dinosaurs. 415 
Laosaurus Marsh, 1878. 
comparison of the three pelves.represented together in Plate X 
(Hesper ornis, Laosaurus and Morosaurus), will make clear the 
intimate relation existing between the pubic bones of Birds and 
has caused } 
had already suggested solution of one difficulty. (Journal Geological 
Society of London, vol. xxxii, p. 334.) 
Am. Jour. Sct.—Tuirp Series, Vou. XVI, No. 95.—Nov., 1878. 
26a 
