664 



NAT A TO RES. 



LARIDJE. 



BULWER'S PETREL. 



Thalassidroma Bulwerii. 



Procellaria Bulwerii, 

 Thalassidroma Bulwerii, 



Bulwer's Petrel, JARDINE and SELBY, Illust. 



Ornith. vol. ii. pi. 65. 

 GOULD, Birds of Europe. 



THALASSIDROMA. Generic Characters. Bill shorter than the head, much 

 compressed in front of the nasal sheath, with the tip of the upper mandible 

 suddenly curving and hooking downwards, and that of the lower one 

 slightly angulated, and following the curve of the upper. Nostrils con- 

 tained in one tube or sheath, but showing two distinct orifices in front. 

 Legs, having the tarsi rather long and slender, reticulated. Feet of three 

 toes, united by a membrane. The outer and middle toes nearly equal in 

 length, and longer than the inner; hind toe represented by a small, 

 straight, dependent nail. Wings long, acuminate. Tail square, or slightly 

 forked. Selby. 



SEVERAL species of Petrel, all of small size, were sepa- 

 rated by the late Mr. Vigors from the other genera of 

 Petrels, on account of distinctions observable in their ex- 

 ternal structures, as referred to in the generic characters,* 

 * Zoological Journal, vol. ii. p. 405. 



