239 
convexior; apertura obliqua, subrhombeo-lunaris; perist. 
tenue, marginibus convergentibus, supero breviter expanso, 
basali reflexo, ad insertionem dilatato. — Diam. maj,. 18, 
min. 15, alt. 8 mill. 
Hab. in insulis Aroo. (Wallace.) 
1952a. Helix caseus Pfr. 
T. umbilicata, depressa, tenuiuscula, irregulariter striata 
et sub lente minutissime granulata, diaphana, albido-cornea 
vel pallide rufescens; spira vix elevata; sutura impressa; 
anfr. 41/, planiusculi, ultimus superne obtuse carinatus, 
antice deflexus, basi turgidus, circa umbilicum conicum 
angulatus; apertura diagonalis, subelliptica; perist. album, 
undique sublate reflexum, marginibus approximatis, basali 
leviter arcuato, juxta umbilicum dilatato. — Diam. maj. 18, 
min. 15, alt. 9 mill. 
Hab. Siam. 
1991a. Helix Livesayı Pfr. 
T. umbilicata, lenticularis, carinata, solidiuscula, ca- 
pillaceo-striata et striis spiralibus obsolete granulata, sericea, 
corneo-albida, fasciis castaneis superne 2, basi unica ornata; 
spira conoidea, obtusa; sutura albomarginata; anfr. 5 con- 
vexiusculi, ultimus carına acuta, prominente, alba munitus, 
versus aperturam superne convexior, inde angustatus, subito 
deflexus, subtus scrobiculatus; apertura fere horizontalis, 
transverse subrhombeo- ovalis; perist. continuum, album, 
expansum et reflexum, margine basalı intus valide uniden- 
tato, tum umbilicum angustum semitegente. — Diam, maj. 
25, min. 21, alt. 10 mill. 
Hab. in insulis Philippinis. 
Proxime affınis 7. scrobiculatae, sed sculptura bene 
distincta. 
26a. Streptaxis sinuosa Pfr. 
T. profunde arcuato-rimata, obligue oblonga, tenuius- 
cula, laevigata, nitida, vitreo-albida; spira subconoidea, 
