354 ACHATINID,!). 



"Alt. 0-41 inch [ = 10*5 mm.], diam. 0-20 [ = 5 mm.], apert. 

 diam. 0-12 [ = 3 mm.], alt. 0-23 [ = 6 mm.]. 



" Animal with a short foot, pointed behind, pale yellow tint ; 

 eye-tentacles dark to the base, lower very short." {Godwin- 

 Austen.) 



Hah, India: Khasi, Jaintia, and jSTaga HWla {Godwin- Austen):, 

 Dikrang Valley, Dafla Hills, 2500 ft. {Godwin- Austen) ; Naga 

 Hills {lioberts) ; Darjeeling, Sikkim {Stoliczka). 



" It aj)pears to be very close to Bid. ^>»<i(S, Bens., from Tavoy. 

 Specimens differ very much in size from different collections. 

 The shell is very finelv developed in the high parts of the North 

 Cachar Hills at 600(3-7000 feet (fig. 7). At Cherra Poonjee it 

 assumes a more tumid form (fig. 7 a), and it is very frequently 

 dwarfed to the length of only 0-36 inch [ = 9 mm.], especially in 

 its lower habitats; but these variations are not of sufficient 

 specific importance." {Godivin- Austen.) 



Jousseaume expressed the opinion* that C. khasianus and 

 C. munipurensis are identical in form. A glance at the figures 

 will convince anyone that this suggestion is not borne out by 

 facts. 



The British Museum possesses four specimens from the Khasi 

 Hills, measuring 12x5-5 mm. 



Genus OPEAS, Alhers. 



Opeas, Albers, Die Heliceen, 1850, p. 175 (as subgenus oi Bvlinnts), 

 first species Bulimus sitbula, Pfeifter : Martens, Die lleliceen, 

 ed. 2, 18G0, p. 265 (as subgenus of Stenogyra), type Helix 

 goodalii, Miller : Crosse & Fischer, Miss. Scient. Mexique, Moll. 

 i, 1877, p. 592 ;'Pilsbry, Man. Conch, ser. 2, xviii, 1906, p. 122. 



Type, Bidimus stwida, Pfeiffer. 



Range. Throughout tropical and subtropical regions, except 

 Australia. 



" Shell small, thin, turrite, usually perforate, with large, obtuse, 

 rounded apex and convex or flattened whorls, corneous or 

 yellox^'ish. Embryonic whorls smooth. Aperture small, ovate, 

 the outer lip thin, usually arched forward, columella straight or 

 concave, not sinuous, the columellar lip reflexed, curving into the 

 basal lip and not toothed or truncate below. Oviparous, the 

 egg-capsules large and spheroidal. 



" Opens contains small, thin, ovi])arous stenogyriiie snails w ith 

 the apex large, obtuse, rounded and smooth, and the columellar 

 margin reflexed, rounded below, or at least not distinctly truncate. 

 The species are spread throughout tropical and subtropical 

 reo-ions, but as yet none is known from Australia. A few species 

 colonize freely, and have spread wherever commerce reaches in 

 suitable climates. Others, restricted to special stations not to be 



* Bull. Soc. Zool. France, x, 1885, p. xxii. 



