GASTROCOPTA, EASTERN ASIA. 105 



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

 bilobed lamella. 



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

 palatal; 214 mm. long; Macao, Hongkong. 



G. meridionalis, no. 44. 

 b 1 . 6 or 7 teeth. 



c. Angulo-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. a. hachijoensis, no. 40a. 

 d 1 . 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. PL 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 5% 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 



