636 



NAT A TO RES. 



LARID.E. 



L ARID JR. 



BULWEKS PETREL. 



Thalassidroma Bulwerii. 



ProceUaria Btdwerii, Bulwer's Petrel, JARDJNE and SELBY, Illust Ornith. 



vol. ii. pi. 65. 

 TMassidroma Bulwerii, GOULD, Birds of Europe, pt. xxii. 



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

 pressed 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 repre- 

 sented 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 ex- 

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



* Zoological Journal, vol. ii. page 405. 



