No. V. MOLLUSCA. 225 



The dentition of the animal of this species closely 

 resembles that of Buccinum grcenlandicum and Neptunea 



a lift qua, as represented by Troschel's figures in his work 

 1 Das Grebiss der Schnecken,' vol. ii. pi. vi. 



The above description was already prepared under the 

 supposition that the specimen before me was distinct from 

 B. Belcheri, when, through the kindness of Dr. Grwyii 

 Jeffreys, I was enabled to compare it with the type of thai 

 species. It is less elongated, has a rather shorter spire; 

 and the body-whorl is more ventricose. The columella also 

 is less arcuate and more oblique, and the spiral ridges and 

 lines of growth are more pronounced. The type does not 

 display such regularity in the alternation of large and small 

 transverse ridges as the variety. A specimen of this species 

 from Finmark, in the collection of Mr. Jeffreys, very closely 

 resembles the shell from Dobbin Bay. 



Buccinum sericatum, Hancock. 



Hah. Dobbin Bay, 30 fms. {Hart). 



The radula of this species, which perhaps is only a variety 

 of B. Grcenlandicum, is remarkable for the unequal dentition 

 of the side plates, one of which is a trifle the narrower, and 

 is furnished with only two fangs : they are 

 subequal in length ; but the inner one is a A, (^) J\ » 

 slightly the stouter. The other lateral plate A/A C^cM 

 has three teeth, of which the outermost is \y \j 



longest, the median smallest, and at the base 

 joins the inner fang. The median plate Z7^sZcll™. 

 bears four small conical denticles. 



The only example of this species is a young shell. It 

 agrees in all respects with Hancock's admirable description, 

 except that the cilia of the epidermis are apparently closer 

 together than in the type, in which they are said to be 6 not 

 much crowded,' whilst in the specimen before me there are 

 about three in the space of a millimetre. The surface of the 

 shell beneath the remarkable epidermis is very curiously 



VOL. II. Q 



