298 CYCLOPHOEID^. 



455. Opisthostoma fairbanki, Bhmford. 



Opisthostoma fairbanki, Blanford, Proc. Zool. Soc. 1866, p. 448, 

 pi. 38, tig. 14; Crosse, Journ. Conchyl. xv, 1867, p. 98; 

 Blanford, J. A. 8. B. xxxviii, 1869, p. 140, pi. 16, figs. 6, Qa\ 

 Hanley & Tlieobald, Conch. Ind. 1875, pi. 117, fig. 8; Pfeiffer, 

 Men. Pneiim. Suppl. 3, 1875, p. 68 ; Tlieobald, Cat. >Shells Brit. 

 India, 1876, p. 43 ; Nevill, Hand List, i, 1878, p. 284 ; Crosse, 

 Journ. Conchyl. xxvii, 1879, p. 195 ; Aucey, Bull. Soc. Malac. 

 France, iv, 1887, p. 274. 



Opisthuiitoma {Euopisthostoma) fairbanki, Kobelt & Mcillendorff, 

 Nachr. Deuts. Malak. Ges, xxx, 1898, p. 134; id., Cat. Pneum. 

 1899, p. 54. 



Opisthostoma (Opisthostoma) fairbanki, Kobelt, Das Tierreich, 

 Lief. 16, 1902, p. 413. 



Original descrijition : — " Testa irregulariter ovafa, albida, con- 

 fertim co.stulata, iineis impressis spiralibus minutis, vix sub lente 

 conspicuis, ssepe obsoletis, inter costiilis signata. Spira breviter 

 subcylindrica, apice perobtuso, sutura profunda. Anfr. 5, rotun- 

 dati, duo apicales parum e.xserti, ex axi deviantes, tertius multo 

 major, quartus maxirmis, quintus brevissime con.strictus, ad 

 stricturani angulo acuto versus umbilicum deflexus, in figurara 

 literse S curvatus, uuibilicuin omniuo tegeiis, denique sinistrorsum 

 ascendens, aai"raetus penultimus undique junctus. Aperfura 

 postica verticalis, subtrigouali-rotundata ; peristoma simplex, 

 undique expausum. Operculum normale. 



"J3iam. iucl. peristom. 1"5 mm.; perist. non incl. 1 mm., alt. 

 1'5 mm. : aperturu3 diam. circa 0*5 mm." 



Hab. India : Kliandalla, Western Ghats. 



" The animal was very difficult to observe, on account of its 

 extreme shyness and minute size. Only a very small portion of 

 the body was extruded from the shell. The foot is very short and 

 apparently rounded, but could not be seen fairly, as the animal 

 would not crawl up a glass but appeared to endeavour to hide 

 itself amougst decayed leaves. The tentacles are short and blunt, 

 the eyes at their outside base, rather high in position, but not 

 nearly so much as in the Aciculaceoe. The whole animal is white 

 and trauslucent, the eyes appearing as black specks, perfectly 

 sessile. After two or three failures I succeeded in examining an 

 operculum by breaking back tlie whorls of a specimen carefully 

 until I came to it. It is lodged at the constriction in the last 

 whorl, as long since suggested by Mr. Benson, and is distinctly 

 horny, concentric, and paucispiral, resembling the figure of the 

 operculum oi Diplomuiatina folllculus given in Adams's ' Gen. Eec. 

 Moll.' This entirely confirms the views I long since expressed as 

 to the close affinitv of Opisthostoma to Diplommatina, and shows 

 the former, moreover, to be nearer to the typical costulate 

 Dlplommatinoe of the Himalaya than to the smooth or spirally 

 Urate species {Ari)iiu, IT. & A. Ad.) of Hindustan, as the latter 

 have the spiral structure apparently obsolete. . . . 



