truncata; apertura coarclata, irregulariter semiovalis; perist. 
crassiusculum, album, nitidum, breviter reflexum. 
Diam. 26, alt. 25 mill. — Ins. Luzon. (Cuming.) 
310. Helix Lessoni Pfr. — An H. Rangii Less. voy. 
p. 305? — T. obtecte perforata, globulosa, minute striatula, 
solidula, castanea, basi pallida; spira turbinata, obtusa; anfr. 6 
vix convexiusculi, ultimus inflatus, «ntice deflexus; apertura 
lunato-rotundata, intus lilacea; perist. undique expansum, album, 
margine columellari superne perdilatato, calloso, albo, umbi- 
licum prorsus claudente. 
Diam. 35, alt. 25 mill. — Australia. (Mus. Britt.) 
311. Helix Gussoneana Shuttl. — T. subobtecte 
perforata, conico-globosa, solida, disüncte minulissime reticu- 
lata, fulvescenti-albida, fasciis 5 castaneis ornata; spira elevata, 
conoidea; anfr. 5 convexi, ultimus vix descendens; columella 
arcuata; apertura rotundato -lunaris, intus nitida; perist. sub- 
simplex, margine dextro vix expansiusculo, columellari dilatato, 
reflexo, albo vel carneo. 
Diam. 34, alt. 30 mill. — Prope Neapolim. (Shuttl.) 
Specimina nonnulla adulta vidi minora, teste fulvescente. 
312. Helix Leytensis Pfr. — H. fragilis Sow. Proc. 
Zool. Soc. 1841. p. 40. — T. imperforata, globosa, tenuissima, 
fragilis, laeviuscula, pallide virens, fasciis interruptis, albis, 
opacis ornata; spira parvula, parum elata; anfract. 4 rapide 
accrescentes, planiusculi, ultimus permagnus, subangulatus; colu- 
mella tenuis, subrecta; apertura ampla, rotundato-lunaris; perist. 
simplex, breviter expausum. 
Diam. 30, alt. 21 mill. — Ins. Leyte. (Cuming.) 
313. Helix dubiosa Pfr. — H. decipiens Reeve Conch. 
syst. t. 165. f. 16. — T. imperforata, depresso-globosa, tenuis, 
obsolete malleata, fulva, fascia suturali et area  columellari 
nigrorufis, fasciisque plurimis epidermidis hydrophanae albidae 
ornata; spira subsemiglobosa; anfr. 4 convexiusculi, celeriter 
accrescentes; columella intrans, planulata, declivis; apertura 
lunato-rotundata, intus margaritacea; perist. tenue, album, late 
expansum, vix reflexiusculum, margine basali cum columella 
angulum obsoletum formante. 
Diam. 35, alt. 26 mill. — Ins. Samar. (Cuming.) 
B.  Fasciis 2 nigricantibus ad peripheriam. 
y. Fasciis periphericis latis, interstitio albido. 
314. Helix Najas Pfr. — T. imperforata, subglobosa, 
tenuis, subtilissime striata, sub epidermide decidua, lutescente 
hyalina, alba; spira brevis; anfr. 4 conyvexiusculi, ultimus valde 
