340 
PROCELLARINiE. THALASSIDROMA. 
and fourth about equal ; tail emarginate or even^ of twelve 
feathers. Tongue much flattened^ tapering to a horny 
point ; oesophagus wide, within the thorax enormously dis- 
tended, and with the proventriculus forming an ovate sac, 
which is recurved ; stomach very small ; intestine short, of 
moderate width ; coeca small ; cloaca globular. 
467. 1. Thalassidroma Leachii, Temm. Leach’s Petrel. — 
Fork-tailed Petrel. 
Plate CCLX. Male and Female. 
Tail forked; bill and feet black; plumage dark greyish-brown; 
quills and tail brownish-black ; smaller wing-coverts and inner secon- 
daries light greyish-brown ; rump, sides of abdomen, and outer lower 
tail-coverts w^hite ; upper tail-coverts also white, but with a terminal 
black band. 
Male, 8, 18^. 
Common on the Banks of Newfoundland, and at times off the coast 
of Massachusetts, Maine, and Nova Scotia. Breeds on the shores of 
Baffin's Bay. 
Thalassidroma Leachii, Bonap. Syn. p. 367. 
Fork-tailed Stormy Petrel, Thalassidroma Leachii, Nutt. Man. v. ii. p. 326. 
Forked-tailed Petrel, Thalassidroma Leachii, Aud. Orn. Biog. v. iii. p. 434. 
468. 2. Thalassidroma Wilsonii, Bonap. Wilson’s Petrel. 
— Mother Carey’s Chicken. 
Plate CCLXX. Male and Female. 
Tail even ; bill and feet black, but the webs yellow, unless at the 
margin ; plumage dark greyish- brown ; quills and tail brownish -black ; 
outer secondary wing-coverts and some of the secondary quills light 
greyish-brown, and tipped with white ; rump, sides of abdomen, and 
outer lower tail -coverts, white. 
Male, 7L 
Wanders from the Gulf of Mexico, off the whole Atlantic coast to 
Baffin's Bay, and often , almost across the ocean towards Europe. 
Breeds in vast numbers from Maine to Baffin's Bay. 
stormy Petrel, Procellaria pelagica, Wils. Amer. Orn. v. vii. p. 90. 
Thalassidroma Wilsonii, Bonap. Syn. p. 367. 
Wilson’s Stormy Petrel, Nutt. Man. v. ii. p. 322. 
Wilson’s Petrel, Thalassidroma Wilsonii, Ann. Orn. Biog. v. iii. p. 486 ; v. v. p. 645. 
