PTEROCYCLOS §. 3. 
49 
13. Pt, bilabiatus Benson. 84 
T. late umbilicata, depressa, fere discoidea, striatula, 
albida, strigis angulosis castaneis picta; spira vix elevata, apice 
obtusiusculo nigricans ; anfr. 5 — 5 '/ 2 convexiusculi , sensim 
accrescentes, ultimus teres, medio castaneo-fasciatus ; apertura 
obliqua, circularis; perist. duplex: internum subcontinuum, 
rectum, superne prof unde incisum, externum juxta anfractum 
penultimum cucullatim inflatum, margine dextro et basalipro- 
funde undulato-crispis. — Operc. (ex Sow.) circulare, spirale, 
intus coneavum, extus conyexum, lamellosum. — Diam. maj. 
20, min. 17, alt. 8 r / 2 mill. Ap. intus 6 mill. diam. (Mus. 
Cuming.) 
Pterocyclos bilabiafus Bens . 1834 in Zool. Journ. Y. p. 462. (absque 
descript.) 
— — Bens. 1836. Journ. As. Soc. V. p. 358. 
— — Pfr. in Zeitschr. f. Malak. 1847. p. 111. 1851 p 4. 
Consp. N. 56. 
— — Chemn. ed. II. Cycl. p. 193. t. 24. f. 11 — 14. 
— — Gray Catal. Cycloph p. 13. N. 6. 
Cyclostoma Inlabiatum Sow. Thes. N. 57 p. 110. t 25. f. 81. 82. ■*-) 
— — Petit in Journ. Conch. 1850 I p 43. 
Habitat Salem prope Madras (Heath, Sowerby). 
14. Pt. Bland! Benson, f 85 
T. latissime umbilicata, orbiculato-depressa, albida, strigis 
undatis radiatis fusco - aurantiis fasciaque unica saturatiore ad 
peripheriam ornata; anfr. 4 r / 2 rapide accrescentes, ultimus 
antice subito valde alatim dilatatus; apertura obliqua; perist. 
subduplex: internum incrassatum, superne liberum, sinuatum, 
externum superne valde expansum, ala soluta antice angulata, 
descendente, supra anfractum penultimum projecta, postice 
sinum exhibente munitum. — Operc.? — Diam. 1" (Bland.) 
— Diam. maj. 29, min. 23 mill, ex ic. (Bens.) 
Pterocyclos Blandi Bens, in Ann. and Mag. VIII 1851. Aug. t. 5. f. 1. 
— — Pfr. Consp. N. 58. 
Habitat ad Pulo Susson insulam prope Pulo Penang jacen- 
tem (Bland). 
*) T. discoidea, spira depressa, fere plana, colore pallido , castaneo- 
undulata; anfr. 5 rotundatis, gradatim majoribus, laevibus ; sutura distincta, 
profundiuscula ; apertura fere circulari; peritremate duplici, interno simplici, 
superne emarginato, externo extus undulato, sinuoso, superne in tuberculum 
fornicatum desinente; umbilico patulo, anfractibus distinctis. (Sow. 1. c.) 
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