PTEROCYCLOS $. 3. 47 
circularis; perist. duplex: internum rectum, superne profunde 
incisum, externum expansiusculum, supra incisuram fornicatim 
dilatatum. — Operc. extus convexo-conicum, subconfertm spi- 
ratum, elevato-lamellatum, intus concavum, nitidum. — Diam. 
maj. 22, min. 19, alt. 8 mill. Ap. diam. 6'/, mill. (Coll. 
Nr. 2 (x) 
Pterocyclos rupestris Bens. in Journ. As. Soc. L. 1832. p. 11. t. 2. 
— — Bens. in. Ann. and Mag. 2d. ser. I p 346. 
— — Pfr. in Zeitschr. f. Malak. 1851. p. 4. Consp. N. 53. 
— — Chemn. ed. II, Cyclost. t. 31. f 3—5. 
— — et pictus Gray Catal. Cycloph. p. 12. N. 3. 5. 
-— pictus. Trosch. in Zeitschr. f. Mal. 1847. p 45. 
— . Pfr. ibid. p. 111. 
— — . Chemn, ed. II. Cyclost. p. 194. t. 24. f. 21—2 
Sleganotoma picta Trosch. in Wiegm. Arch. 1837. I p. 165. t. 3, 
L49 13.*) 
-- piclum Phil. Ycon. I. 5. p. 105. Cycl. t. 1. f. 5. 
Cyclostoma . . . . Sow. Conch. Man. f. 531? 
-— piclum Petit in. Journ, Conch. 1850, I. p. 43. 
8. Minor; diam. maj. 14, min. 12, alt. 6'/, mill. (Mus. Cuming. et Benson.) 
Pterocyclos rupestris var. Chemn. l. c. t. 31. f 9—11. 
Habitat prope Pathargata provinciae Dahár Indiae. 
10. P't. nanus Henson. 81 
T. profunde perspective umbilieata, depressa, discoidea, 
albida, fascia media strigisque undulatis castaneis superne or- 
nata; spira prominula, saturatior; anfr. 4'/, convexi, ultimus 
supra solutus; apertura obliqua, circularis; perist. duplicatum, 
marginibus sulco leviter impresso vix discretis, interno superne 
profunde recteque inciso, externo reflexiusculo, supra sinum 
alam angustam fornicatam, antice breviter descendentem, angu- 
. . . o 
latam, formante. — Operc.? — Diam. maj. 10, min. 8, alt. 
5 mill. (B.) 
Plerocyclos nanus Bens. in Ann. and Mag. nat. hist. 2d. ser. N. 48, **) 
Habitat ad basin montium ,Nilgherries*, Indiae Australis. 
*) T.late umbilicata, depressa, suborbiculari, solida, albida, fascia fusca 
cincta; spira prominula; anfr. sub-6 cylindraceis; suturis profundis; oper- 
culo acetabuliformi. — Diam. 8, alt. 3!/,'. ('Trosch. l. c.) 
**)'This interesting addition to the genus was sent to me by Dr. Jerdon 
with specimens of Pterocyclos bilabiatus Som.  Possessing a similar deep 
umbilicus, narrower than in the other known species, it was overlooked as 
a young and imperfect specimen. On examination it proves to have arrived 
