PTEROCYCLOS §. 3. 
47 
circularis ; perist. duplex: internum rectum, superne profunde 
incisum, externum expansiusculum, supra incisuram fornicatim 
dilatatum. — Opere. extus convexo-conicum, subconfertim spi- 
ratum, elevato-lamellatum, intus concavum, nitidum. — Diam. 
maj. 22, min. 19, alt. 8 mill. Ap. diam. 6 f / 2 mill. (Coll. 
Nr. 27.) 
Pterocyclos rupestris Bens, in Journ. As. Soc. I. 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. Mai. 1847. p 45. 
— — Pfr. ibid. p. 111. 
— - — Chemn . ed. II. Cyclost. p. 194. t. 24. f. 21—25. 
Steganotoma picta Trosch. in Wiegm. Arch. 1837. I p. 165. t. 3. 
f. 12. 13.*) 
— piclum Phil. Icon. I. 5. p. 105. Cycl. t. 1. f. 5. 
Cyclostoma .... Sow. Conch. Man. f. 531? 
— piclum Petit in Journ. Conch. 1850. I. p. 43. 
ft. Minor; diam. maj. 14, min. 12, alt. 6*/ a mill. (Mus. Cuming, ct Benson.) 
Pterocyclos rupestris var. Chemn. 1. c. t. 31. f 9—11. 
Habitat prope Pathargata provinciae Bahar Indiae. 
10. Pt, nanus Benson, f si 
T. profunde perspective umbilicata, depressa, discoidea, 
albida, fascia media strigisque undulatis castaneis superne or- 
nata; spira prominula, saturatior; anfr. 4‘/ 2 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, a/ngu- 
latam, formante. — Operc. ? — Diam. maj. 10, min. 8, alt. 
5 mill. (B.) 
Pterocyclos 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. 3y 2 '". (Trosch. 1. c.) 
**) This interesting addition to the genus was sent to me by Dr. Jerdon 
with specimens of Pterocyclos bilabiatus Sow. 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 
