BULWER S PETREL. 



513 



NATATORES. 



LARIDJE. 



<_-.i 



BULWER'S PETREL. 



Procellariu Bulwerii, Bulwer's Petrel, Jardine and Selby, Illust. Ornitli. 



vol. ii. pi. 65. 

 Thalassidroimi Bulwerii, ,, ,, Gould, Birds of Europe, pt. xxii. 



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 contained 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, dependant 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 external struc- 

 ture, as referred to in the generic characters,* as well as 



* Zoological Journal, vol. ii. page 405. 

 VOL. Ill, 2 L 



