1819.] discovered by the Isabella. 203 



Species 1. Arctica, purpurascente-carnea tenuiter striolata, 

 operculo testaceo. 



Baffin's Bay, Capt. Ross, Capt. Sabine. 



Species 2. Striata, anfractibus longitudinaliter striatis et 

 oblique autiquatis. 



Baffin's Bay, Mr. Beverly. 



Genus Natica (Lamarck). 



Species 1 . Beverlii, spira elevatiuscula, anfractibus superiori- 

 bus convexiusculis. 



Baffin's Bay, Mr. Beverly. 



Species 2. Fragilis, spira fere obsoleta, testa fragillissiraa, 

 operculo hyalino. 



Baffin's Bay, amongst the soundings taken up by Capt. Ross's 

 instrument. 



Genus Bttcciiium, of authors. 



Species 1. Boreale, purpurascente-brunneum, anfractibus 

 cancellato-striolatis, supra abbreviato costatis, lineis prominulis 

 1-canaliculatis spiraliter ascendentibus. 



Baffin's Bay, on Hare Island, Mr. Beverly. 



The canal of the anterior part of the shell is of a moderate 

 length. 



Species 2. Rossii, anfractibus tribus basilaribus transversim 

 costatis : tertio costis superne imperfectis, anfractibus apicakbus 

 simplicibus glabris. 



Baffin's Bay, Mr. Beverly. 



This species resembles at first sight Buccinum Bamffium 

 (murex Bamffius, Donovan), but it may readily be distinguished 

 by the number of costated whirls, Bamffium always having the 

 four basal ones ribbed.* 



Class Concha. 

 Family I. — PholadidjE? 



Genus Pkoleobia (Leach). 



Char. Testa elongata, portice clausa antice hians : cardo 

 edentulus : Ligamentum exterius prominens. 



Species Rugosa. — Myrtillus rugosus, of English authors. 



Family II. — Myao«? 



Genus Pandora (Lamarck). 



Species Glacialis, antice rotundata obtusa, dentibus cardina- 

 libus crassissimis. Taken up with soundings in Baffin's Bay. 

 Received also from Spitzbergen. 



• Mr. Beverly communicated to me an Aihatina, which he found on an island in 

 Baffin's Bay, and as it i. a tropical genus, I cannot refrain from noticing so extra- 

 ordinary an occurrence. 



