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. ?>}â– > • 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
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