ZOOLOGY. MOLLUSCA. 181 



Pecten zig-zag, L. 



W. Indies, Pacific Ocean. 



Pecten imbricatus, Gmel. 



St. Thomas, Pacific Ocean, Australia. 



Spondylus Americanus, Lain. 



W. Indies. 



There seems to be much confusion regarding the species of 

 Spondylus which inhabit the West Indian and Bermudian 

 waters, and, as it appears to me, an unnecessary multiplication 

 of specific names. The individual variation among the 

 species is very great, and does not permit of that close charac- 

 terization of forms which has been attempted by some syste- 

 matists. I believe that Spondylus Americanus includes much, 

 if not all, of what has been described under Spondylus longi- 

 tudinalis, S. ustulatus, S. coccincus, and S. erinaceus. 



Anomia ephippium, L. 



America, Europe. 



Ostrea frons, L. 



W. Indies. 



PULMONATA. 



The land shells enumerated in the following list are in ex- 

 cess by some ten forms of the number hitherto credited to the 

 Bermudas. Most of these we collected ourselves or obtained 

 through the aid of local collectors; others I found in the col- 

 lection made a few years ago by Mr. G. Brown Goode, while a 

 few have been quite recently sent to me by Miss A. Peniston, 

 of Peniston's, Bermuda. The remaining forms are given on 

 the authority of Fischer (Manuel de Conchy liologie), Bland 

 (quoted by Wallace in " Island Life," pp. 256-57), and Pfeiffer. 

 These are preceded by an asterisk. For the determination of 

 the species I am largely indebted to Mr. H. A. Pilsbry, Conserva- 

 tor of the Conchological Department of the Academy of Natural 

 Sciences, who has also prepared a special paper on the more 



