1889.] LAND-SHELLS FROM KOROR. 115 



inner lip of the peristome round the apex of the aperture is only 

 represented by a very thin film, so much so that except under a 

 powerful lens the peristome appears to be interrupted. 



9. DiPLOMMATINA STRIGATA, Var. KORORKNSIS. (Plate XII. 



figs. 9, 9 a.) 



Shell sinistral, ovate, conical, slightly rimate, moderately thick, 

 bright brown-coloured : whorls 6|^, the penultimate much the largest ; 

 sculpture on all the whorls, except the last, a fine, close, oblique 

 striation, on the last whorl coarse, distant, and lamella-like, the last 

 whorl not ascending at all on the penultimate ; the constriction on 

 the penultimate indistinct over the right centre of the aperture : 

 peristome double, only moderately thick, the inner lip continuous, 

 striated on the portion above the aperture, the outer lip distinctly 

 winged : aperture vertical, circular, within shining and orange- 

 coloured ; a small rounded swelling near the base of the columellar 

 margin is generally (but not always) present. Length 4g niillim. 



Hub. Koror. 



This, M. Crosse informs me, differs from the type in being a 

 rather thicker shell, the penultimate whorl being more swollen, 

 the aperture larger, and the lamella-like costulation of the last 

 whorl more regular and prominent ; the artist who drew the type 

 has, M. Crosse writes, failed to render the costulations of the last 

 whorl correctly, otherwise the figure fairly represents my specimens. 



HuNGERFORDiA (new genus). 



This genus difi"ers from Biplommatina in its trochiform shape, 

 fewer whorls, which are not convex, in the great dilatation of the last 

 whorl, and in the constriction and operculum being in the last whorl 

 only half a turn from the aperture. Only one species has been found 

 (many examples), so that I do not give a generic character apart 

 from that of the species ; other species will probably be discovered 

 in this group of islands (as yet little explored), which will either 

 establish it as a good genus, which it appears to be, or connect it 

 with Diplommatina only as a subgenus. 



10. HuNGERFORDIA PELEWENSIS, Sp. UOV. (Plate XI. figS. 10, 



10a, 10 i, 10 c.) 



Shell sinistral, trochiform, very thin, yellowish green : whorls 5^, 

 not convex, except the last, which is slightly so ; penultimate 

 much the broadest, formed of about 13 oblique, slightly imbricated 

 plaits, which terminate in small wing-like convex processes extending 

 beyond the margin ; the apical 1^ whorls very small, smooth ; third 

 and fourth whorls with a fine, very oblique striation, the suture of 

 the fourth being shghtly winged ; last whorl very thin, expanded, 

 and wing-like, not ascending at all on the penultimate, furnished 

 with fine oblique striations, a slight constriction about half a turn 

 from the aperture ; umbilicus generally prominent, sometimes hidden 



