1862.] DR. L. PFEIFFER ON NEW LAND SHELLS. 269 
distincte angulatus, subtus convexus, lutescens, circa umbilicum 
angustum striis spiralibus subundulatis sculptus; apertura 
obliqua, rotundato-lunaris, intus concolor, margaritacea; perist. 
simplex, rectum, marginibus convergentibus, columellari ad in- 
sertionem breviter fornicato-reflero. 
Diam. maj. 61, min. 49, alt. 30 mill. 
Hab, Lao Mountains, Camboja (Mouhot). 
4, Hexrx pentena, Pfr. (701 a). (Pl. XXXVI. figs. 11, 12.) 
T. late umbilicata, lenticularis, pertenuis, rugoso-striata et 
striis spiralibus minutis confertissimis decussata, pellucida, 
pallide cinnamomea ; spira parum elevata, vertice subtili ; su- 
tura marginata ; anfr. 6, vie convexiusculi, lente accrescentes, 
summi liris nonnullis elevatis sculpti, ultimus acute carinatus, 
supra carinam leviter canaliculatus, basi convexior ; apertura 
parum obliqua, subrhombea ; perist. simplex, rectum, margine 
columellari ad insertionem vix dilatato. 
Diam. maj. 323, min. 29, alt. 11 mill. 
Hab. Lao Mountains, Camboja (Mouhot). 
5. Hexrx wizArpeEnsis, Pfr. (729 a). TT. umbilicata, conoideo- 
lenticularis, solida, carinata, conferte costulato-striata et lira 
filiformi juxta carinam posita instructa, cerea ; spira conoideo- 
convexa ; sutura carinato-exserta; anfr. 8, planiusculi, lentis- 
sime accrescentes, ultimus basi convexiusculus, ruditer striatus ; 
umbilicus mediocris, profundus, 3- diametri vix equans ; aper- 
tura subverticalis, anguste angulato-lunaris ; perist. simplex, 
rectum, margine basali leviter et regulariter arcuato. 
Diam. maj. 73, min. 73, alt. 3 mill. 
Hab. Lizard Islands (Macgillivray). 
Nearly allied to the Ceylonese Helix clathratula, Pfr. (Puteolus 
clathratulus, Bens.), but larger, more flattened ; the umbilicus much 
smaller, the strize less elevated, the peripherical keel sharper, and the 
second keel running closely approximate to it. 
6. Hexrx m..ustris, Pfr. (1313 6). (Pl. XXXVI. fig. 8.) 7. 
imperforata, globoso-turbinata, solida, oblique et transverse 
irregulariter malleato-rugosa, nitidula, castanea ; spira convexo- 
turbinata, vertice obtuso ; anfr. 5, convexiusculi, regulariter ac- 
crescentes, ultimus utrinque convexior, medio obtuse angulatus, 
antice vix descendens ; columella subverticalis, brevis, fornicato- 
dilatata, lilaceo-carnea ; apertura obliqua, subtriangulari-luna- 
ris, intus margaritacea; perist. expansum et reflexiusculum, 
lilaceo-carneum, marginibus callo nitido lilacino junctis. 
Diam. maj. 62, min. 52, alt. 35 mill. 
B. Fulvo-lutescens, fascia una mediana castanea ornata, perist. 
earneo-albido. 
Diam. maj. 63, min. 51, alt. 37 mill. 
Hab. Lao Mountains, Camboja (Mouhot). 
