751 
39. Pterocyclus cucullus G. Austen. 
Taf. 113. Fig. 7-8. 
Testa latissime et perspectiviter umbilicata, plano-depressa, discoidea, sub epidermide 
crassa subtiliter* striata, pallide fasca late fusco flammulata; spira plana apice haud promi- 
nente, sutura impressa. Anfractus fere 5 rotundati, sat rapide crescentes; apertura obliqua 
circularis; peristoma duplex, internum continuum, simplex, externum acute reflexum, extus 
dilatatum, margine supero producto, impresso. — G. Austen angl. 
Diam. maj. 26, min. 22, alt. 5,5, alt. apert. 8,5 mm: 
Pterocyclus cucullus Godwin-Austen, Pr. zool. Soc. London 1889 p. 340 
t. 35 fig. 2, 2a. — Kobelt & Moellendorff, Catalog, in: Nachrbl. 
D. malak. Ges. 1897 vol. 29 p. 113 — Kobelt, in: Tierreich, 
Heft XVI p. 105. 
„Shell dextral, flatly discoid, very amply and perspectively umbilicated; sculp- 
ture a thick epidermis, with fine lines of growth; colour pale sienna with broad 
flame-like zigzag markings Crossing the whorls transversely ; apex perfectly flat; su- 
ture impressed; whorls nearly 5, rounded, rather rapidly increasing; aperture ob- 
lique, circular; peristome double, the inner continuous, simple, the outher sharply 
reflected and increasing in breadth on the outher margin, and the upper, where it 
droops over into a corol-like shape, havring one single depression or fold. — Oper- 
culum very dark brown, multispiral, with raised edges.“ — Gr. Austen. 
Hab Niah Hills, Borneo. 
40. Pterocyclus blandi Benson. 
Taf. 109. Fig. 11. 12. 
Testa latissime umbilicata, orbiculato-depressa, albida, strigis undatis radiatis fusco- 
aurantiis fasciaque unica saturatiore ad peripheriam ornata. Anfractus 4 1 / 2 rapide accres- 
centes, ultimus antice subito valde alatim dilatatus. Apertura obliqua; peristoma subduplex: 
internum incrassatum, superne liberum, sinuatum, externum superne valde expansum, ala 
soluta antice angulata, descendente, supra anfractum penultimum projecta, postice sinum ex- 
hibente munitum. — Bens. 
Diam. maj. 29, min. 23 mm. 
Pterocyclus Blandi Benson, in: Ann. nat. Hist. 1831 ser. 2 vol. 8 p. 1% 
t. 5 fig. 1. — L. Pfeiffer, Monogr. Pneumon. vol. 1 p. 49. — 
