OCR Text |
Show 1877.] MR. G. F. ANGAS ON NEW MOLLUSCA FROM JAPAN. 529 11. Descriptions of a new Genus of Gasteropodous Mollusca from Japan, and of a new Species of Bullia from Kur-rachi. By GEORGE FRENCH ANGAS, C.M.Z.S., F.L.S., &c. [Eeceived June 2, 1877.] (Plate LIV.) Subfamily FUSING. T H A T C H E R I A , new genus. Shell angularly pyriform, solid; spire prominent, shorter than the aperture, many-whorled, whorls flattened above, strongly keeled at the periphery and contracted below ; aperture with a broad incurved sinus between the extremity of the last keel and the junction of the body-whorl; basal canal wide and open; columella smooth ; outer lip simple below the sinus. THATCHERIA MIRABILIS, n. sp. (Plate LIV. figs. 1 a, 1 b.) Shell angularly pyriform, solid, yellowish white; spire elevated, and acuminate towards the apex; whorls 8, flattened, and slightly excavated above, strongly and prominently keeled at the periphery, and sloping inwards below, above the keels finely arcuately striate, below irregularly more or less crenately concentrically ridged ; aperture triangularly subquadrate, pure white, and shining within ; columella smooth, slightly arcuate above, nearly straight below, white ; outer lip with a broad excavated sinus extending from its juncture with the body-whorl to the extremity of the last keel; below the keel, which is very prominent, the lip is simple and arcuate. Alt. 3 inches 6 lines. Diam. 2 inches. Length of aperture 2 inches 2 lines. Hab. Seas of Japan. This very remarkable shell, quite unlike anything hitherto met with, was recently brought from Japan by M r . Charles Thatcher. The specimen is believed to be unique. Without a knowledge of the operculum, its exact generic position cannot be determined; but at present I regard it as belonging to the subfamily Fusinse. BULLIA (LEIODOMUS) KURRACHENSIS, n. sp. (Plate LIV. fig. 6.) Shell acuminately turreted, solid, white, tinged with rose-colour on the upper whorls ; spire elongated, apex very sharp ; whorls 9, somewhat convex, excavated and strongly keeled below the sutures, regularly transversely ribbed and longitudinally ridged with the lines of growth, the ridges becoming more or less imbricate and angled upon the keel, overlapping each other and forming a slight irregular coronation, last whorl with a sharp keel near the base; aperture ovate, outer lip simple. Alt. 1 inch 9 lines. Diam. 9 lines. Hab. Kurrachi, Scinde, N . W . India. The type specimen of this elegantly turreted species was obtained PROC. ZOOL. Soc-1877, No. XXXIV. 34 |