I Dr. P. V. Carpenter on new Forms of Mollusks. 311 XXXII. — Diagnoses of new Forms of Mollusks collected at Cape St. Lucas by Mr. J. Xantus. By Philip P. Carpenter, B.A., Ph.D. The specimens here described belong to the Museum of the Smithsonian Institution, Washington, D. C. The first avail.able duphcates will be found in the British Museum or in the Cumingian Collection. An account of the labours of Mr. Xantus will appear in the forthcoming volume of British Association Reports ; and detailed notes on the species may be consulted in the American scientific periodicals for the current year. Genus Asthenoth^rus*. Testa extus " ThracicB" similis : iutus cardine edentulo, baud spathulato ; cartilagine infra umbones sita. 1. Asthenotharus villosior. A, testa insequivalvi, insequilaterali, umbonibus ad trientera lon-gitudinis sitis ; tenuissima, alba, (sub lente) omnino minutissime et creberrime pustulosa ; rugis incrementi obtusissimis, irregulari-bus, maxima t. juniore, ornata ; epidermide tenui, pallide olivacea induta ; parte postica truncata, parum hiante ; antica valde rotun-data ; marginibus dorsalibus et ventrali parum excurvatis ; um-bonibus angustissimis ; regionibus lunulari et nympbali subcari-natis : intus, margine cardinali utriusque valvse acute ; ligamento inconspicuo ; cartilagine subspongiosa, satis elongata, postice de-flecta ; fovea baud indentata ; cicatricibus adductorum parvis, subrotundatis ; sinu pallii majore, ovali, ad dimidiura interspatii porrecto. Long. '38, lat. -26, alt. "14 poll.f 2. Solemya valvulus. S. testa minore, tenuissima, diapliana, vix testacea, cornea, pallidiore, lineis tenuibus, distantibus, fuscis, radiatim ornata ; postice tenui-ter radiatim striata ; tumente, satis elongata, marginibus antico et postico regulariter excurvatis ; umbonibus vix conspicuis ; lineis anticis divaricantibus, extus parentibus, intus lacunam cartila-gineam definientibus ; cardine edentulo ; ligamento postice elon-gate, antice curte, latiore, bifurcate ; cicatricibus adductorum subrotundatis. Long. "85, lat. •25, alt. "14 poll. 3. Tellina [PeroncEoderma] ochracea. T. testa majore, parum insequilaterali, tenui, satis planata ; carneo-ochracea, intus intensiere ; Isevi, nitida, marginem versus striis incrementi ; postice vix radiatim striatula ; ventraliter antice valde excurvata, postice vix angulata ; marginibus dorsalibus ob-* 'Aadevfjs, weak ; daipbs, hinge. f The measures of length are taken from the anterior to the posterior margins.
BioStor
