82 HELIX. 



convex, the last not descending, periphery rounded, scarcely obtusely 

 subangulated, base convex ; peristonie sublabiate within, somewhat 

 thickened at the base. Diam. 12'5 mill. 



Ins. Upolu. 



Subsection VIDENA, H. and A. Adams, 1852. 

 H. PLANORBIS, Lesson. PI. 16, figs. 78-82. 



Widely umbilicated, thin, fragile, yellowish, marbled with olive 

 above ; whorls 5, the last acutely carinated. Diam. 15 mill. 



Sumatra, Java, Borneo, Celebes, Ternate, etc. 



Var. APPROPINQUATA, Mart. Figs. 80-82. 

 Distinctly spirally striated above and below. 



Var. LESSONII, Mart. 



Slightly spirally striate below only. 



Var. JAVANICA, Mousson. 

 Spiral strise obsolete. 



Var. NUMMUS, Issel. 



A little smaller, depressed, widely umbilicated, obliquely striu- 

 late, whorls scarcely planulate, suture margined. Diam. 8-10 mill. 



H. PAVIEI, Morlet. PL 14, fig. 5. 



Widely umbilicated, thin, corneous, radiately thinly striate, with 

 some spiral lines at the base of each whorl ; whorls 7, a little con- 

 vex, the last acutely carinated, convex below. Diam. 14 mill. 



Cambodia. 



H. LOMONTI, Brazier. PI. 15, figs. 50-52. 



Widely umbilicated, thin, pellucid, light reddish corneous, darker 

 banded on the carina, suture narrowly margined; whorls 5i, the 

 last acutely carinated. Diam. 12'5 mill. 



New Guinea. 



H. BICOLOR, Martens. PI. 16, figs. 83-85. 



Moderately umbilicated, striulate, shining with fine spiral lines 

 above ; chestnut color, with a sutural zone, carina and umbilical 

 region whitish ; whorls 5i-6, slightly convex, the last with carinated 

 periphery, not descending in front, base subangulated at the 

 umbilicus. Diam. 13 mill. 



Sumatra, Borneo. 



H. ZOLLINGERI, Pfr. PI. 16, fig. 86. 



Moderately umbilicated, thin, striated, chestnut color, variegated 



