751 



39. Pterocyclus cucullus G. Äusten. 



Taf. 113. Fig. 7-8. 



Testa latissime et perspectiviter umbilicata, plano-depressa, discoidea, sub epidermide 

 crassa subtiliter striata, pallide fusca 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, simpIex, 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. See. 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 bland! Benson. 



Taf. 109. Fig. 11. 12. 



Testa latissime umbilicata, orbiculato-depressa, albida, strigis undatis radiatis fusco- 

 aurantiis fasciaque unica saturatiore ad peripheriam ornata. Anfractus 4^2 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. 196 

 t. 5 fig. 1. — L. Pfeiffer, Monogr, Pneumon. vol. 1 p. 49. — 



