384 Scientific J^otices. 



it necessary to consider these two animals for the future as the types of 

 two distinct genera. 



The accompanying rough sketch of the cheliferous member of the 

 larva of the Lobster, ['1 ab. XV. f, 13] in which a is the claw, b the outer 

 division of the limb or future flagrum, and c the rudimentary branchia, 

 will enable naturalists that may have access to the work of Rathke, to 

 institute such a comparison as may probably enable them to decide, 

 whether there are any grounds for suspecting that a similar structure 

 prevails in that of the River Crawfish. 



lam, Sir, 



Yours, &c. 

 Cork, Dec. 16, 1830. Jno. V. Thompson. 



Kote on Procellaria Anginho, Hein., and Proc. Bulverii, Selby and 



Jard. 



Procellaria Anjinho described by the late Dr. Heineken in Brewster's 

 Journal, and proposed vdth some doubt as a new species, proves, according 

 to the remark of the Rev. L. Jenyns, to be altogether identical with the 

 Sooty Petrel of Latham's Synopsis, the Procellaria fuliginosa of Gmeliii 

 and Latham's Index. Procellaria Bulverii of Selby and Jardine's 

 Illustrations of Ornithology cannot be considered as differing from the 

 same species in any thing but age. Young birds of P. fuliginosa have 

 the plumage rather fuller and consequently appear rather larger; their 

 tail is either perfectly even or has the middle feathers elongated. But if 

 a large assortment of individuals be examined, several constantly occur 

 upon which it is impossible to decide whether they belong to the latter 

 or to the forked-tail sort, the transitions or variations in this character 

 are so gradual and inconspicuous, and are moreover unaccompanied by 

 any regular corresponding differences of size or plumage. In no other 

 essential point does Proc. Bulverii appear to differ from Proc. Anjinho, 

 and both must hereafter merge into synonyms of Proc. fuliginosa, 

 GmeL 



Madera. R. T. Lowe. 



