190 



Biomedea anglica. — The right tarso-metatarsus (A) and first phalangeal of the 

 fourth digit (B) ; from the Eed Crag. }. (From the Quart. Journ. Geol. 

 Soc.) 



Incertm Sedis. 

 Genus HYDRORNIS, Milne-Edwards ^ 

 Founded upon a tarso-metatarsus of somewhat larger size than that of Quer- 

 guedula crecca, which, while agreeing with the Anseres in the extreme shortness 

 and backward inclination of the second trochlea, approximates to Puffinus in 

 the more complex talon, the slight degree of lateral compression, the channel on 

 the anterior surface, and the muscular ridges on the posterior surface ; although 

 differing by the low proximal iutercotylar tuberosity. The two points of inser- 

 tion of the tibialis anticus are united, indicating a limb adapted for swimming. 



Oiseaux Fossiles de la France. Tol. i. p. .%2 (1867-68). 



