182 BUCCINUM. 



very distinctly two molluscan faunal provinces, but it has since 

 been found throughout the waters of the New England States, 

 and, according to Captain Gedney, off New Jersey, N. lat. 40, 

 W. long. 73, in 32 fathoms, sandy bottom. It occurs generally 

 in deep water, and not so numerously, however, south of Cape 

 Cod. It has been dredged at 100 fathoms in the Bay of Fundy, 

 but off 'the European coast has been found as deep as 650 

 fathoms. 



Mr. Verrill remarks that " the ordinary American specimens 

 from shallow water differ considerably in form from the typical 

 European specimens, but the species is quite variable on both 

 coasts, and I have examined large specimens from St. George's 

 Bank and La Have Bank, dredged by Mr. S. I. Smith, which 

 differ very little from the common European form, and it is easy 

 to form series connecting these with our common shore specimens. 

 I am, therefore, unable to agree with Dr. Stimpson, who con- 

 sidered our species distinct from the European, and adopted the 

 name undulatum for it."* 



In addition to the varieties enumerated in Dr. Jeffrey's descrip- 

 tion of the species, I have figured others from Sars, Middendorff 

 and Reeve ; they are possibly none of them really entitled to 

 varietal names. These are Yar. coerulea (fig. 314), Var. Schanta- 

 rica (fig. 317), from the Sea of Ochotsk, B. pyramidale, Reeve 

 (fig. 366), B. Labradorense, Reeve (fig. 322) = the American 

 form of B. undatum, called B. undulatum, and a representation 

 of the latter form (fig. 318) from Gould's Invertebrate of Massa- 

 chusetts. To these synonyms I add B. parvulum, V erk. (fig. 323 ) , 

 B. fragile, Verk. (fig. 324), and B. conoideum, Sars (fig. 325) ; 

 species which can have no place in the genus unless we agree to 

 a minute discrimination of its variable characters. It is true 

 that a slight difference exists in the dentition between one of 

 these forms and the normal dentition of B. undatum (PI. 27, 

 fig. 29), namely, a variation in the number of tooth-like points 

 developed on the plates, the formula of B. undatum, B. conoideum 

 and B. parvulum being 4 6 4, that of B. fragile 3*4*3, accord- 

 ing to Sars, but Meyer and Mobiusf have shown that the central 



* Kept. U. S. Fish Com'r, 638, 1875. 

 f Fauna der Kielerbucht II. ) 



