BOYSIDIA. 205 



tubercle above the middle of the outer lip. Above this tubercle 

 the lip is thin and strongly arcuate. Length 2.2, diam. 1.5 mm. 



India: Landour, with B. plicidens Bens. Type no. 16721 

 A. N. S. P. 



Bifid-aria (Bensonella) landurensis PILSBRY, Nautilus, vol. 

 29, Nov. 1915, p. 73. 



This species is related to B. paviei. It is more lengthened 

 than that species, with more numerous and more regularly 

 increasing whorls, of a paler color. The surface does not show 

 the minutely granulose spirals of paviei. B. landurensis is 

 perceptibly smaller than B. plicidens, and differs from that 

 species in the following respects: the angular lamella does 

 not emerge quite to the edge of the peristome, and it is con- 

 tinuous, not interrupted, within. The parietal lamella is less 

 remote from the lip-edge, emerging nearly as far as the an- 

 gular. The lower palatal plica is somewhat stronger, there are 

 fewer plicse, and finally, none of the teeth terminate anteriorly 

 in hooks. 



10. BOYSIDIA (?) DAYANA (Stoliczka). PL 34, figs. 5, 6. 



Shell minute, eonoidal, rather solid, pale brown, with the 

 apex rather obtuse, widely and deeply, perspectively umbili- 

 cate; whorls 4, convex, separated by a deep suture, the first 

 smooth, somewhat mamillate, the rest marked with subobsolete 

 growth-stria? ; the last whorl largest, coiled nearly in a plane, 

 subaugular above at the periphery, then gradually narrowing 

 and obtusely angular at the verge of the umbilicus. Aperture 

 nearly vertical, slightly descending, dilated, subcircular; 

 margins joined, a little thickened within, and having fold-like 

 teeth. Labium adnate, moderately expanded, two-toothed, the 

 upper tooth larger. Labium 6-toothed : two rather separated 

 teeth on the columellar region, two others in the outer lip, 

 similar and distinct from one another, but the two in the 

 basal margin are small and near together. Diam. inaj. 1.1, 

 min. 0.8, alt. 1 mm. (Stol.). 



Burma : Damotha, near Moulmain. 



Hypselostoma dayanum STOL., Journ. As. Soc. Bengal, xl, 

 1871, p. 172, pi. 7, f. 2. Hanley & Theobald, Conch. Indica, 

 1876, pi. 147, f. 10. GUDE, Fauna Brit. Ind., Moll., ii, p. 300. 



