HELIX S. 192. 401 
2635. Hi. Ileucotropis Pfr. 
T. anguste umbilicata, depressa, solidula, conferte stria- 
tula, nitidula, carnea; spira breviter conoidea; sutura albo- 
marginata; anfr. 4!/ convexiusculi, ultimus carina compressa, 
acuta, alba munitus, antice vix descendens, basi convexior; 
apertura obliqua, subrhombeo-lunaris; perist. tenue, marginibus 
convergentibus, supero breviter expanso, basali reflexo, ad in- 
sertionem dilatato. — Diam. maj. 18, min. 15, alt. 8 mill. 
(Mus. Cuming.) 
Helia leucotropis Pfr. in Proc. Zool. Soc. 1861. p. 22. (Malak. 
Bl VIL p. 238.) 
Papuina, leucotropis Wallace in Proc. Zool. Soc. 1865. p. 4114. 
Habitat in insulis Ara. (Wallace). 
2636. EH. caseus Pífr. 
T. umbilicata, depressa, tenuiuscula, irregulariter striata 
et sub lente minutissime granulata, diaphana, albido-cornea vel 
pallide rufescens; spira vix elevata; sutura impressa; anfr. 
A! planiusculi, ultimus superne obtuse carinatus, antice de- 
flexus, basi turgidus, circa umbilieum  conicum angulatus; 
apertura diagonalis, subelliptica; perist. album, undique sub- 
late reflexum, marginibus approximatis, basali leviter arcuato, 
juxta umbilicum dilatato. — Diam. maj. 18, min. 45, alt. 9 
mill. (Mus. Cuming.) 
Helic caseus Pfr. im Proc. Zool. Soc. 1860. p. 134. (Malak. Bl. 
VIL: *pó 2539.) 
— —  (Plectotropis) Mart. Ostas. Zool. IL. p. 79. 
Habitat Siam. 
2631. H. Emma Pífr. 
T. umbilicata, depressa, tenuiuscula, conferte et irregula- 
riter rugoso -striata, superne liris nonnullis obsoletis cincta, 
haud nitens, carneo et albido variegata; spira breviter conoi- 
dea, vertice acutiusculo; sutura linearis; anfr. 4 planiusculi, 
ultimus acute carinatus, antice vix descendens, basi convexus; 
umbilicus angustus, pervius; apertura perobliqua, rotundato- 
rhombea; perist. tenue, marginibus convergentibus, supero 
expanso, antrorsum arcuato, ad carinam subsinuato et leviter 
rostrato, basali reflexo, ad insertionem dilatato. — Diam. maj. 
48, min. 14!/5, alt. 7!/; mill. (Mus. Cuming.) 
Helix Emma Pfr. im Proc. Zool Soc. 1862. p. 273; Novit. 
conch. p. 2007 Nr. 340. £55; £^ 4——T, 
Habitat «Lao Mountains» Cambojae (Mouhot). 
* 
