110 GASTEOCOPTA, EASTERN ASIA. 



curving downward. Basal and palatal plicae as in G. armi- 

 gerella, the lower palatal being longer than the upper, supra- 

 palatal and basal smaller than either. Length 2.05, diam. 

 1 mm. 



Korea: Kojeto (Hirase). Type and para types No. 95775 

 A. N. S. P. 



This species differs from G. armigerella by having the colu- 

 mellar lamella short and straight, wholly horizontal, the inner 

 end not bent down, and by the absence of an infraparietal 

 nodule. 



42. GASTROCOPTA HIRASEI n. sp. PL 21, figs. 5, 6, 7, 10. 



The shell is tapering-cylindric, shaped like B. armigerella, 

 whitish-corneous, very slightly striate, composed of 5 rather 

 strongly convex whorls, the last one flattened over the lower 

 palatal region, slightly grooved over the lower palatal plica. 

 Angulo-parietal lamella arcuate in a basal view (pi. 21, fig. 7), 

 the inner end curving towards the columella. It is low in the 

 middle, at the junction of angular and parietal elements, the 

 angular and inner end of parietal being high. Infraparietal 

 lamella pliciform, well developed. Columellar lamella hori- 

 zontal in front, but inward forming a broad, down ward- turned 

 plate. There is also a convex hyaline callous ascending the 

 axis, within the back (pi. 21, fig. 6). Basal fold sub- 

 columellar in position, subvertical. Palatal plicae strong, the 

 lower one long; suprapalatal minute. Peristome thin, well 

 expanded. Length 2, diam. 0.95 mm. 



China: Shan-hai, Province Pe-chili (Hirase). 



This species has all the apertural processes more developed 

 than G. armigerella, the parietal lamella being bent inward, the 

 infraparietal in form of a short lamella instead of a nodule, 

 and the columellar lamella expanding in a broad plate. 



A single specimen collected with G. coreana at Kojeto, Korea, 

 has the bent parietal and broad columellar lamella of hirasei, 

 though a little less strongly developed, but the infraparietal 

 is tubercular, as in armigerella. It measures, length 2.28, 

 diam. 1.1 mm. It will probably prove to represent a Korean 

 subspecies. 



