The single specimen which formed the type of the genus was dredged in Puget Sound, was over five inches long and of various bright colors, the head subglobose, higher than oral opening, branchiæ in six pairs, comparatively smaller and erect, all of which differences may have arisen from more perfect development, and from having been observed under more favorable conditions. From its rarity on our southern coast we may expect to find it more abundant northward. Dr. Kellogg read a paper describing a new species of ALSINE, collected by Mr. Bolander, in the swamp near Mission and Howard and Seventh and Eighth Streets, San Francisco. Description of a New Species of Alsine. BY A. KELLOGG, M.D. ALSINE Wahlenb. _A. palustre_ Kellogg. Plant slender, somewhat decumbent at the base, simple or slightly branching at the summit, glabrous, sulcate on opposite sides of the stem, sub-flexuous, six inches to a foot in height. Leaves lance-linear, acute, mucronate, glabrous, margins scabrous, sub-connate and slightly sheathing at the membranous base, shorter than the internodes (half to more than an inch in length). Peduncles slightly compressed, axillary, solitary, long, naked. Sepals ovate-lanceolate, acute or subacute, one to three-nerved, green with scarious margins, about half the length of the petals. Petals white, oblanceolate, obtuse, entire. Stamens ten, subequal, short. Styles three; stigmas deeply biparted. A plant very abundant in swamps in this vicinity, known to us for the last ten years, but as we find no description which we recognize, we conclude it must be unknown. Blossoming in July and August. Specimens by Mr. Bolander. REGULAR MEETING, SEPTEMBER 7th, 1863. President in the Chair. Present, seven members. Donations to Cabinet: Fishes, crustacea, and shells from the Sandwich Islands, by Andrew Garrett, Esq. Donations to the Library: Proceedings of the Boston Society of Natural History, Vol. ix, sigs. 13 and 14, May and June, 1863. Proceedings of the Academy of Natural Sciences of Philadelphia, for April and May, 1863. Proceedings of the Royal Horticultural Society, Vol. 3, No. 5, May, 1863. Silliman’s Journal, July, 1863. Professor Whitney presented the following paper by Dr. J. G. Cooper: On a New Genus of Terrestrial Mollusca Inhabiting California. BY J. G. COOPER, M.D. BINNEYA Cooper.[4] _Generic characters._—General form of animal like _Limax_, with a shell resembling that of _Omalonyx_ or _Lamellaria_.