HESPEKORNITniD.E. 209 



A. 31. Cast of the left tibio-tarsus, in a crushed condition. Original 

 figured by Marsh, op. cit. pi. xiv. ; see fig. 49, B. 



A. 32. Cast of the left patella. Original figured by Marsh, op. cit. 

 pi. XT. figs. 1-3 ; see woodcut 49, C. The basal perforation 

 is shown. 



A. 33. Cast of the left tarso-metatarsus. Original figured by Marsh, 

 opt. cit. pi. xvi. 



A. 34:-43. Cast of the phalangeals of the left pes, and of the metatarsal 

 of the hallux. Figured by Marsh, oj). cit. pis. xviii., xix. 



Hesperornis crassipes, Marsh \ 



Syn. Lestornis o-assipes, Marsh ^. 



Of larger size than //. re(jaJts, vrith a stouter tarso-metatarsus ; 

 these difl'erences being regarded as probably of more than sexual 

 value. 



Bah. North America. 



A. 44. Cast of a slab of rock showing the ventral aspect of the 

 sternum. The original, which forms a portion of the type 

 skeleton, was obtained from the Cretaceous of Western 

 Kansas, and is preserved in the Museum at Yale College. 

 It is figured by Marsh in his ' Odontornithes,' pi. viii. 

 figs. 1-3. Presented hy Professor 0. 0, Marsh. 



' Amer. Journ. ser. 3, vol. xi. p. 500 (1876). — Lestornis. 

 ^ Loc. cit. 



