Mr. A. Adams on the Animals of certain Mollusca. 109 



XVIII. — Notes on the Animals of certain Genera of Mollusca. 

 By Arthur Adams, F.L.S. &c. 



Genus Volutharpa, Fischer. 



M. Fischer, in his 'Journal de Conchyliologie/ 1855, p. 85, 

 describes a genus under the name of Volutharpa, from the shell 

 only. When at Hakodadi, I found the Bullia Perryi of Jay, 

 and refer it to M. Fischer's genus ; and further north, at Aniwa 

 Bay, Saghalien, I met with Bullia ampullacea of Middendorf, 

 and believe it to form another species of the same genus. I 

 procured by the dredge one living specimen of the latter species 

 from a depth of 17 fathoms. The animal is like Buccinum, of a 

 white colour sparsely sprinkled with black on the head, foot, and 

 siphon. The tentacles are broad, close together at the base, and 

 rather short, with the eyes on the outer side, near the middle. 

 The siphon is thick and short, and the foot is fleshy, and simple 

 behind. The operculum is subcircular, with concentric stria? of 

 growth ; and the nucleus is within the margin, at the fore part. 

 Thus the simple foot and the possession of eyes remove it from 

 the genus Bullia, and the form and texture of the shell from 

 Buccinum, The operculum is different from that of Pseudoliva 

 or Gastridia, and the shell is without the tooth at the fore part 

 of the outer lip. The natural position of the genus is between 

 Buccinum and Pseudoliva. 



Species of Volutharpa. 

 ( Deshayesiana, Fisch. 

 S*™t\a. ?>}■> • ampullacea, Midd. (Bullia). 



Perryi, Jay (Bullia). 



Limnseana, A. Ad. (Bullia). 



Genus Naticina, Gray. 



The animal of this genus resembles that of Morvillia or 

 Limneria ; and the genus should be removed from the family 

 Naticidse to that of Velutinidse. The tentacles are short and 

 rather flattened, with the eyes at their outer bases. The mantle 

 lines the shell, and is thickened at the edge, but is not produced 

 beyond, and does not cover the margin of the shell, as it does 

 in Marsenina and Velutella. The foot is small and oblong, auri- 

 culate on each side in front; and there is no operculum. The 

 male organ is large and compressed, and is situated at the outer 

 base of the right tentacle. A fold of the mantle covers the colu- 

 mellar lip of the shell. The animal is timid, crawls very slowly, 

 and is of a dead white colour. Dredged from 46 fathoms, in the 

 Straits of Korea. 



Genus Stenothyra, Benson. 



The animal of Stenothyra or Nematura is similar to that of 



