STROBILOPS OP JAPAN, KOREA AND CHINA. 43 



internal barrier consisting of a columellar, 3 basal folds 

 and one above periphery. Korea. S. coreana, No. 12. 

 Umbilicus larger, contained about 5% times in the diam- 

 eter; internal structure unknown. China. 



8. diodontina, No. 11. 



11. Strobilops diodontina (Heude). PI. 10, figs. 1, 2, 3. 

 Shell very small, moderately umbilicate; fulvous, with a 



silky gleam ; trochoidal, spire conic ; whorls 5, cylindric, the 

 last indistinctly depressed-angular, convex below; with an 

 epidermis provided with thick spiral striae and folds. Aper- 

 ture oblique, semilunar, obstructed by two parietal lamellae; 

 peristome expanded, reflected, umbilicus wide, penetrating. 

 Height 1.5, diam. maj. 2.5, min. 2 mm. {Heude). 

 China: Tchen-k'eou (Heude). 



Helix diodontina Heude, Notes sur les Moll. terr. de la 

 vallee du Fleuve Bleu, in Mem. concernant I'Hist. Nat. de 

 I'Empire Chinois, 1880, p. 112, pi. 29, f. 11. 



This species is known only from Heude 's incomplete ac- 

 count. His figures are reproduced. It appears to be similar 

 in size and shape to S. coreana, but from the description and 

 figures it should have a larger umbilicus, contained about 5% 

 times in the diameter of the shell. That of the Korean species 

 is much smaller. S. diodontina differs from 8. Jiirasei by its 

 smaller size. 



12. Strobilops coreana Pilsbry, n. sp. PI. 10, figs. 8, 9, 10. 

 The shell is rather depressed with dome-shaped spire, 



rounded periphery (very weaklj^ subangular in front) and 

 convex base ; umbilicus small, contained 9 times in the diam- 

 eter. Cinnamon-brown, rather glossy, with weak, rather fine 

 growth-wrinkles above, weaker on the base. The whorls are 

 rather strongly convex. The aperture is lunate, lip expanded, 

 heavily thickened within, russet. The parietal lamella is some- 

 what higher than the infraparietal, both emerging to the edge 

 of the parietal callus; they penetrate about one-fourth of a 

 whorl, then diminish to a low thread which continues some 

 distance further. They flare outward and are strongly nodose 



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