0. C. Marsh—Description of Hesperornis regalis. 361 
The femur is unusually short and stout, much flattened 
antero-posteriorly, and the shaft curved forward. It some- 
what resembles in form the femur of Colymbus torquatus Briin., 
but the great trochanter is oP acess A much less developed in 
tendinal bridge, differing in this respect from all known aquatic 
birds. The fibula is well developed, and resembles that of the 
birds, There is a shallow groove, also, between the second and 
third metatarsals, which taken in connection with the deeper 
is indicated by an elongated oval indentation on the inner 
m 
there is broad, shallow depression, extending rather more than 
half way to the distal extremity. : 
halanges of the large, external toe are very uliar, 
altho gh an approach to the same structure is seen in the genus 
Podiceps. On the outer, inferior margin they are all deeply exca- 
