46 
MYCHOPOMA. RHIOSTOMA. 
unicolori fusca, fimbriam pilorum brevium circa umbilicum 
ferente, induta; sub epidermide albida, liris confertis spiralibus 
ornata. Spira conica; sutura valde impressa. Anfr. con- 
vexi, ultimus teres, antice subdescendens. Apertura obliqua, 
fere circularis; peristoma duplex: externum limbo sublate ex- 
panso circumdatum, ad angulum aperturae antice porrectum; 
internum vix discretum intus subdistanter corrugatum; mar- 
gine columellari amborum valde repando, glabro, vix expan- 
siusculo. — Operculum minus crassum quam in M. hirsuto, 
extus concaviusculum, lamina calcarea ad centrum carente 
intus planum. — Diam. maj. 5 1 / 4 — 7, min. 4V 2 — 6, axis 
4^4 — 5 l / 2 , apert. diam. intus 2 — 2 3 / 4 mill." (Bl.) 
Mychopoma limbiferum W. T. Blanf. in Journ. As. Soc. Beng. XXXVIII. 
Pt. 2. p. 133. t. 16. f. 4. (Contrib. to Ind. Malac. 
X. 1869.) 
Habitat in summis montibus „Pulney“ dictis Indiae me- 
ridionalis (Fairbank). 
X. Rhiostoma Benson. 
Pfr. Mon. Pneum. III. p. 38. — Blanford in Ann. and 
Mag. nat. hist. 3d. ser. XIII. (Jun. 1864.) p. 451. — Martens 
Ostas. Zool. II. 1867. p. 63. — Patel Catal. 1873. p. 16. 119. 
Species : 
1. Houjsei (Cyclostoma) Haines. (Coll. 1.) II. 29 (Pterocyclos). 
Ill) 38. — Martens Ostas. Zool. II. p. 63. — Patel Cat. p. 119. 
— Siam. 
2. Hainesi Pfr. (Coll. 2.) III. 38. — Martens Ostas. Zool. II. p. 64. — 
Patel Cat. p. 119. — Pterocyclos Hainesi Reeve. — Camboja. 
3. simplicilabre Pfr. III. 39. — Pterocyclos smplicilabris Reeve. — 
Camboja. 
4. Haughtoni Bens, f III. 39. — Haul. 8f Theob. Conch. Ind. t. 5. f. 
10. Conf. Stoliczlca in Journ. As. Soc. XL. 1871. Pt. 2. p. 150. — 
Pterocyclos Haughtoni Reeve. — Moulmein Birmaniae. 
5. tenerum (Pterocyclos) Menke. (Coll. 3.) II. 32 (Pterocyclos). 
III. 40. — Touranne Cockinchinae. 
6. Bernardii Pfr. III. 40. — Martens Ostas. Zool. II. p. 64. — Ptero- 
cyclos Bernardii Reeve. — Siam. 
