240 Dr. Gwyii Jeffreys on Arctic 



ni^re sur ceux qui habitant un fond vaseux, II me semble 

 hors de doute que ces deux formes constituent une seule et 

 meme esp^ce." See also my remarks on the epidermis of 

 Fusus Sabini in the ' Annals of Natural History ' for April 

 1877, p. 327. It is impossible to form a satisfactory opinion 

 as to the discrimination of species and varieties without 

 having had an opportunity of examining and comparing a great 

 number of specimens from many localities. That opportunity 

 has fallen to my lot with respect to B. Groenlandicum and 

 its varieties. 



Fusus Sabini, Gray. 



Buccinmn Sahinii, Gray in Suppl. App. Parry's Voyage, p. ccxl,= 

 Fusus Sahini, Gray, Zool. Beechey's Voyage (1839). 



Our arctic species agrees with Gray's description in every 

 particular except size, which he gives as " axis three-fourths 

 of an inch, diameter three-eighths ; " and it must be borne in 

 mind that he says, " the specimen brought home appears to be 

 young." My largest specimen is double the above size, being 

 an inch and a half long and three fourths broad. 



I will complete Mr. Smith's list by giving a few more 

 stations from the Arctic Expedition, as well as by adding 

 another species. 



1. Leda minuta, Miiller. 

 Franklin-Pierce Bay, 15 fms. (Feilden). 



2. Trochus helicinuSy Fabricius. 

 Franklin-Pierce Bay (Feilden) . 



3. Trochus umbilicalis^ Broderip and Sowerby. 

 Discovery Bay, 5| fms. (Feilden). 



4. Trochus oUvaceus, Brown (1827). 



Trochus argentatus, Gould (1841). 

 Margarita glauca, MoUer (1842). 

 Margarita Harrisoni, Hancock (1846). 

 And apparently M. albula, Gould (1862), 



These specimens were deposited in the Museum of Eco- 

 nomic Geology. 



Mr. Smith says that the arctic collection of shells leads to 

 the conclusion that the MoUusca of West Greenland are 

 American rather than European, because " of the 34 species 

 obtained, at least 16 are found off the Atlantic coast of the 

 United States, whilst only 4 or 5 have been recorded from 



