GASTROCOPTA, EASTERN ASIA. 105 



a 2 . Angular and parietal lamellae united into a continuous, 

 bilobed lamella. 



&. 4 teeth : augulo-parietal, columellar, upper and lower 

 palatal ; 2% mm. long ; Macao, Hongkong. 



G. meridionalis, no. 44. 

 6 1 . 6 or 7 teeth. 



c. Augulo-parietal lamella arcuate in basal view, 

 its inner end curving towards columella ; infra- 

 parietal pliciform; Pe-chili. 



G. hirasei, no. 42. 



c 1 . Angulo-parietal lamella approximately straight 

 in a basal view. 



d. Inner end of columellar lamella bent 

 down ; a tubercular infraparietal lamella 

 usually present. 



e. Length 2.25 to 2.5 mm.; Japan, 

 China. G. armigerella, no. 40. 



e 1 . Length 2 mm. ; more broadly ovate ; 

 Hachijo I. 



G. d. hachijoensis, no. 40a. 

 d l . Columellar lamella short and straight, 

 horizontal; no infraparietal lamella or 

 tubercle. 



e. Length about 2 mm. ; Korea. 



G. coreana, no. 41. 



e 1 . Length about 1.5 mm.; Sytchuan. 

 G. monadicula, no. 43. 



38. GASTROCOPTA CHICHIJIMANA n. sp. PI. 20, figs. 1, 2. 



The shell is rimate, ovate-conic, pale olive-buff (dotted with 

 white by disintegration of the cuticle in the specimens seen), 

 almost smooth but hardly shining, composed of 5Vs rather 

 strongly convex whorls, the last one flattened over the lower 

 palatal region, having a strong, wide and rounded crest be- 

 hind the lip. Aperture having 8 teeth, of which three, sub- 

 equal, are on the parietal wall; the angular lamella is weakly 

 connected with the parietal by a low callous at its inner end ; 

 parietal lamella more deeply placed, its anterior end about as 



