1877.] MR. G. F. AN6AS ON NEW MOL,LUSG«jL 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. 



[EeceiTed June 2, 1877.] 



(Plate LIV.) 



Subfamily Fusing. 

 Thatcheria, 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 ; aper- 

 ture triangularly subquadrate, pure white, and shining within ; colu- 

 mella 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 Mr. 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, ove'-'apping 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 

 Prog. Zool. Soc— 1877, No. XXXIV. 34 



