S. testâ diaphanâ, ovato-rotundatâ, ventricosissimâ, transversim creberrimè striatâ; spirâ brevissimâ; aperturâ patulâ; long. 4⁄8 paulo plus; lat. ⅜ paulo plus; poll.

Habitat ad insulam Juan Fernandez.

Marinula. Nov. Genus.
Character Genericus.

Testâ ovato-productâ, sub-solidâ; aperturâ ovatâ, integrâ; columellâ bidentatâ, et basin versus uniplicatâ; dentibus magnis sub-remotis conniventibus, superiore maximo; operculum nullum.

42. Marinula pepita.

M. testâ ovato-productâ, viridi-fuscâ; anfractibus sub-tumidis; spirâ brevi; aperturâ nigricante; dentibus plicâque albidis; long. 7⁄16; lat. 4⁄16; poll.

Habitat ad insulam Chilóe. Mus. Brit., nost., Brod., G. Sowerby.

This animal, which I have thought it necessary to assign to a new genus, appears to have for its nearest neighbours the genera Auricula and Pedipes. It was found on the wooden piles which support the mole in the Bay of San Carlos, in Chilóe, below the wash of the high water. The mole stands out into the sea, and there is no fresh water near it, save a very little rill, which discharges its tiny stream more than fifty yards off.

43. Lymnæa diaphana.—No. 349 MSS.