IMPKNNKS. 



321 



Uemis THALASSIDROMA. 



Vi<?ors, Zool. Journ. ii. p. 405 (1825). 



Thalassidroma pelagica. 



Procellaria pelcKjica, Linnaeus, Syst. Nat. i. p. 212 (1706). 

 Thalassidroma pelagica (L.), Dresser, B. Eur. viii. p. 401, pi. nVX 

 fig. 1 (1874). 



The Stormy Petrel. 



Hah. Atlantic Ocean. 



1575. Natural skeleton. 0. C. 1224 a. Yarrell Collvrtion. 



Genus CYMOCHORHEA. 



Coues, Proc. Philad. Acad. 1804, p. 75. 



Cymochorhea leucorrhoa. 



ProceUaria Inicorrhoa, Yieill. N. Diet, xxiii. p. 422(1817). 

 Ci/mochorea leucorrhoa {\ .), Baird, Brewer, & Rid,ij;\v. Water Birds 

 ^N.-Amer. ii. p. 407 (1884). 



Leach's Petrel. 



Hah. Atlantic Ocean. 



1576. Sternum, with right coraeold, scapula, an;! furcula. S. S. 



2037. 



Order II. IMPENNES *. 



[C/. Seebohm, Classif. B.p. 35. Bphenisciformes, Sharpe, Review,]). 71.] 



A. Palate schizognathous. 



B. Bones of the wing flattened. 



(J. Scapula very broad, not differino; very niucli in size from th(> 



keel of the sternum. 

 D. First digit of the manus fused with the second in the adult 



bird. 



* Watson, Rep. Voy. ' Challenger,' vii. pp. 1-244, pis. i.-xix. (1883) ; 

 Menzbier, Bull. Soc. Nat. Mosc. 1887, pp. 483-587, pi. viii. ; Stejneger, Stand. 

 Nat. Hist., Birds, p. 84 ; Lydekker, Cat. Fo.s.sil B. Brit. Mas. p. V.n (18U1). 

 P.m;t 111. Y 



