GASTROCOPTA. 11 



Siibgenera, of Gastrocopta. 



ALBINULA Sterki. Whitish forms with a palatal callous 

 and palatal plicas. The inner end of the parietal lamella 

 curves towards the periphery, and (except in G. holzingeri) 

 the anterior end is concrescent with the angular lamella. 

 Inner end of the coluniellar lamella curves downward. Type 

 G. contracta (species 1 to 3, 46 to 51). 



SINALBINULA Pils. Whitish, with plicae on a palatal cal- 

 lous. Parietal lamella straight inside, or curving towards the 

 columella, its anterior end usually free, but sometimes the 

 angular and parietal lamellas are eoncrescent into a single 

 sinuous lamella. Coluniellar lamella horizontal, or with the 

 inner end curved downward. Type G. armigerclla (species 

 nos. 38 to 45, 52 to 65, etc.). 



VERTIGOPSIS Ckll. and Sterki. Whitish, with palatal plicae 

 and usually with a palatal callous. Parietal lamella small, 

 short and straight, the minute angular coucrescent with it or 

 wanting. Columellar lamella horizontal or having the inner 

 end decurved. Type G. pentodon (species 4 to 7). 



AUSTRALBINULA Pils. Whitish forms with palatal plicas but 

 no palatal callous. Angular and parietal lamellae diverging 

 in front, the parietal curving towards the columella within. 

 Columellar lamella steeply running upward within. Type G. 

 rossiteri. 



PRIVATULA Sterki. Whitish, without palatal callous or 

 plicae; angulo-parietal and coluniellar lamellae very small. 

 Type G. corticaria (species no. 15). 



IMMERSIDENS Pils. & Van. Whitish or cinnamon shells 

 with palatal plicae but no palatal callous. Parietal lamella 

 curving towards the periphery at its inner end, diverging 

 from the angular anteriorly, in form of a reversed letter "y". 

 Columellar lamella horizontal or decurved at the inner end. 

 Basal plica transverse to the cavity when present. Type G. 

 ashmuni (species nos. 8 to 14, 34 to 36). 



GASTROCOPTA Wall. Whitish or cinnamon shells with pala- 

 tal plica? but no palatal callous. Angular and parietal 

 lamellae concrescent into a single sinuous lamella, which is 

 rarely a little forked anteriorly. Columellar lamella short, 



