TOBNATELLIDES OF HAWAIIAN ISLANDS. 249 



Island were collected on the leaves of honohouo (Commelina 

 nudiflora) . This variety is shorter and broader in proportion 

 to its length than the typical form. The parietal lamella is, 

 also, more deeply cleft. 



An embryonic shell, with just over two whorls, is perforate. 

 The surface is nearly smooth with no indications of spiral 

 lines. The colmnella is truncate below, the lower margin 

 being formed by the lower colmnellar fold, the upper fold 

 being merely indicated by an oblique swelling. The parietal 

 lamella is entire (fig. 5). 



53. T. DREPANOPHORA C. & P., n. sp. PI. 52, tigs. 11, 12, 13. 



Shell perforate, narrowly turrited, corneous, somewhat 

 glossy, under a lens minutely striate with lines of growth, 

 thin, translucent. Spire elongately turrited, with slightly 

 convex outlines, apex obtuse. Suture simple, impressed. 

 Whorls 6^, the first increasing rapidly, the rest compressed, 

 convex, increasing very slowly and regularly, the last slightly 

 tumid, with a slightly flattened base. Aperture auriform, 

 narrow. Parietal lamella low in front, higher in back, with a 

 scythe-like tooth where the low and high portions unite, the 

 back portion strongly arcuate above. Columella tumid, un- 

 armed. Peristome (slightly broken in the type) thin, with 

 slightly flattened outer margin. Umbilicus large, nearly cir- 

 cular. Length 2.15, diam. 1.0, axis of apert. 0.65, par. lam. 

 0.02 (in front) 0.09 (in back), umb. 0.39 mm. 



Kauai: Puukapele, on dead fern leaves (Cooke). Type no. 

 36242 Bishop Museum. 



An immature specimen with 4% whorls has no spiral lines 

 011 the embryonic whorls. The parietal lamella is entire, very 

 large and curved outwards, 0.21 mm. in height. The colu- 

 mella is furnished with two almost transverse, rather deeply- 

 seated folds, which are nearly equal in size. The upper is 

 0.07, the lower 0.09 mm. in height (fig. 13). 



It is an extremely rare species, of which only three speci- 

 mens have been taken. Its small size and the peculiar form 

 of the parietal lamella easily separate it from other species 

 of the group. 



