The Fauna of British India, including Ceylon and Burma / edited by A.E. Shipley, assisted by Guy A.K. Marshall. Mollusca. (Freshwater Gastropoda & Pelecypoda.) / by H.B. Preston.

Date:
1915
Catalogue details

Licence: In copyright

Credit: The Fauna of British India, including Ceylon and Burma / edited by A.E. Shipley, assisted by Guy A.K. Marshall. Mollusca. (Freshwater Gastropoda & Pelecypoda.) / by H.B. Preston. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

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    Btv'm ; anterior side rounded ; posterior side somewhat angularly rounded; lateral margins sloped; ventral margin rounded, slightly contracted towards the posterior side ; umboes large; interior of shell purplish-white. Long. lOo, hit. 12 mm. Hub. Phenehooganj, Sylhet, Assam. Type in the Indian Museum, Calcutta. Allied to C. iravadica, Benson, but is more trigonal and more swollen. 357. Corhicula quilonica, Benson. Corbicula quihmica, Benson, A. M. N. H. ser. 3, vi, 1860, p. 2(30. Corbicula quilonensis [sic] Benson ; Prime, Ann. Lye. Nut. Hist. N.Y. viii, 1866, p. 224, fig. 56; Cat. Corbiculid», 1869-70, p. 135, no. 87; Clessin, in Martini & Chemnitz, 1870, p. 135, pi. 24, fig. 10. Original description:—Testa inequilateral)', trigono-rhomboidea, gibba, tenui, concentrice subremote costata, costis postice evanes- centibus, sulcis intermediis latioribus, sub lente decussatim striatis, albida vel lutea, radiis fuscis angustis ornata ; umbonibus promi- nentibus, apice fere eroso; latere antico breviore, valde arcuato, angustiore, postico striato, latiore ; superue efc basin versus angulata; margine ventrali mediocriter arcuato; ligamento ob- lougo intra uates atteuuato ; pagina interna valde concava, albida, maculis radiisque purpureis ornata; dente mediana vulvae dextrsa duplici, dentibus lateralibus brevibus serrulatis. Long. 8, lat. 10, diain. 5-5 mm. Hab. Near Quilon, in (probably brackish) ponds. The author adds a note to his description from which the following may be quoted :— The younger shells are more gibbous towards the umbones in propoi'tiou to their length than the larger specimens. A tawny-yellow epidermis covers the fresher speci- mens. The rays are numerous, more or less broad, sometimes appearing as mere lines of small spots, and occasionally spreading so as to make the surface appear nearly black The shortness of the lateral teeth, on the anterior side especially, is a notable character, as well as the inequilateral form, which is more conspicuous in the young than in the adult shell. 358. Corbicula alberti, Preston, nom. nov. Corbicula violacea, Clessin, in Martini & Chemnitz, 1870, pp. 180- 181, p. 30, figs. 18, 19. Shell small, almost equilateral, swollen, fairly thin, polished, shining, strongly and distantly ribbed, covered with a dark olive- brown periostracum; anterior side scarcely attenuated, rounded ; posterior side dilated, truncated ; vertical transverse section cordate; horizontal contour ovate; umbones broad, in Hated,