STBOBILOPS OP JAPAN, KOREA AND CHINA. 45 



ture is oblique and lunate, peristome russet, expanded and 

 well thickened; parietal callus moderately heavy. The pari- 

 etal lamella is rather strong and emerges to the edge of the 

 callus. The infraparietal lamella is relatively strong though 

 much lower than the parietal, and emerges nearly to the edge 

 of the parietal callus. Both lamellae penetrate inward about 

 one-third of a whorl, being conspicuously nodose at the edges, 

 and there is a very weak continuation to about half a whorl 

 inward. At a point about one-fourth of a whorl inward there 

 is a low, short and blunt columellar lamella and two short 

 basal folds. All or part of these are visible in an oblique view 

 in the aperture, but owing to the opaque texture of the shell 

 they are not visible through the base in specimens examined. 



Height 2.2, diam. 3.2 mm. ; 51/2 whorls. Type. 



Height 2.1, diam. 3 mm. ; 5l^ whorls. 



Korea: Cheju, Quelpart Island (T. Kuroda). 



Strohilops hirasei Pilsbry, The Conchological Magazine, II, 

 No. 8, August, 1908, p. 39, fig. 1; Nautilus, XXII, p. 79. 



This relatively large, solid Strohilops is distinguished from 

 the preceding and the following species by the number of 

 internal basal plicse (two). It is somewhat larger than S. dio- 

 dontina, in which the internal armature is unknown. 



The growth wrinkles or striae are rather fine and somewhat 

 sharp below the suture, but are not regular in development in 

 the peripheral and basal parts. 



14. Strohilops nipponica Pilsbry, n. sp. PL 10, figs. 11, 12, 

 13, 14. 



The shell is depressed, with low dome-shaped spire, rounded 

 periphery (very obtusely subangular in front of the aperture) 

 and convex base, the rather wide umbilicus contained about 

 5I/2 times in the diameter; rather thin, the base somewhat 

 translucent. Cinnamon-colored, rather glossy, finely and 

 lightly striate, the stria; stronger below the suture. The aper- 

 ture is lunate, lip russet, slightly expanded, rather wide at 

 basal and columellar margins but less thickened than in the 

 Korean species. The parietal lamella emerges to the lip edge, 

 is high and flares outward. Infraparietal lamella is lower and 



