the West Coast of Davis's Strait. 327 



no traces of it remain, for at an early stage the outer layer to- 

 wards the apex becomes eroded, and the striae consequently com- 

 pletely destroyed. 



This well-marked species occurred in great abundance ; nearly 

 forty specimens were brought. 



Buccinum undulatum, Moller. 

 Buccinum undulatum, Moller, Index Mollus. Groenl. p. 11. 



There are two specimens of a Buccinum in the collection, one 

 much injured, the other immature, which I think must be re- 

 ferred to this species. They agree very well with the description 

 in the ' Index Molluscorum Groenlandiae/ excepting that they 

 want the waved ribs : the whorls are very much rounded, and 

 have strong, raised spiral lines of a reddish brown colour inter- 

 rupted with white. The larger shell is upwards of an inch and 

 three-quarters in length. 



This appears to be a very distinct species. 



*2 Buccinum tenebrosum } n. s. PI. V. figs. 1, 2. 



Shell ovate, ventricose, very thin, glossy, of a dark obscure 

 violet, clouded and spotted with grayish white and tawny, parti- 

 cularly at the sutures, where the spots are usually well-defined ; 

 whorls six or seven, much rounded, and covered with fine waved 

 lines of growth, and a few minute, depressed spiral lines obsolete 

 on the body-whorl ; body-whorl one-third longer than the spire, 

 with eight or nine strong, distant spiral ridges or keels, three or 

 four of which are continued on to the third whorl ; mouth as long 

 as the spire, broadish oval, with the interior of a dark chocolate- 

 brown extending over the columella ; outer lip thin, entire ; colu- 

 mella very dark, glossy, rather straight, with an obsolete plait or 

 fold, which gives to it the appearance of being twice bent ; the 

 inner margin is well raised and considerably reflected ; the canal 

 short and rather wide ; epidermis very strong, of a greenish horn- 

 colour, glossy, with fine distant longitudinal laminae, bearing 

 minute widely separated cilia. Length 1£ inch ; breadth nearly 

 1 inch. 



The dark colour, the fragile, horn-like texture, the short, thick 

 form, much rounded whorls, and spiral ridges give to this species 

 a very characteristic appearance. The ridges vary a little in 

 number, but are nevertheless pretty regular, and seem constant. 

 The lines of growth have a smooth, polished appearance, and are 

 much more conspicuous than the depressed spiral lines, especially 

 on the body-whorl, where in many specimens they are scarcely to 

 be traced. 



It would appear that this, like many of the allied species, is 

 occasionally plaited at the sutures of the whorls, for out of eight 



