727 
10« Pterocyclus niahensis baramensis KobeÜ, 
Taf. 105. Fig. 7-9. 
Testa latissime et perspectiviter umbilicata, depressa, fere discoidea, solida, liueis in- 
creraenti subcostiformibus obliquis sculpta, sub epidermide crassiuscula fusca strigis fulguratis 
angustis regularibus albis ornata. Spira plana, apice parvo. Anfractus 5 convcxi, sutura 
profunda subcanaliculata discreti, regulariter sed celeriter accrescentes, ultimns ad peripheriam 
subangulatus, ad angulum lira distincta munitus, supra liris 4 obtusis, aperturam versus 
distinctioribus cinctus, infra lineis elevatis nonnullis minus distinctis, dein laevis, ad aperturam 
leniter descendens. Apertura perobliqua, circularis; peristoma duplex, internum continuum 
porrectum, leviter expansum et subretiexum, lutescens, sulco perprofundo ab externo discre- 
tum; extern um magis obliquum, album, tenue, ad suturam sinulum perprofundum fere tubu- 
liformem formans, dein depressum, ad dextram valde expansum et reflexum, ad columellam 
angustatum. 
Diam maj. 26, min. 21. alt. 10 mm. 
Pterocyclus niahensis var. baramensis, Kobelt, Moll Kükenthal, m: Ab- 
handl. Senckenb. Gesellsch., vol. 24 p. 34 t. 4 fig. 1. — Kobelt 
& Möllendorff, Catalog Pneumon., in: Nachrbl. D. malak. Ges. 
1897 vol. 29 p. 114; Sep. p. 26. 
Durch die tiefe rinnenförmige Naht und die schärfere Spiralskulptur von dem 
Typus unterschieden. Ein gutes Exemplar von Kükenthal am Baramfluss in Nord- 
borneo gesammelt. 
11. Pi erocyclus cetra Bensoo. 
Taf. 105. Fig. 10-12. 
Testa late umbilicata, orbiculato-depressa, capillaceo-striatula, luteo-covnea, superne 
strigis radiantibus, subremotis, irregularibus, rufis ornata; spira planata apice vix prominulo. 
Anfractus 5 convexiusculi, regulariter accrescentes, ultimus breviter descendens, circa umbili- 
cum dimidium diametri subaequantem subangulatus. Apertura obliqua, circularis; peristoma 
duplex; internum continuum, breviter porrectum, superne breviter emarginatum, externum 
expansum, incrassatum, superne lingua obtusa vix descendente, sinu profundo ab anfractu 
penultimo separata, munitum. — L. Pfr. 
Diam. maj. 13, min. 10, alt. 4 mm. 
Pterocyclus Cetra Benson, in: Ann. nat. Hist. 1856, ser. 2 vol. 17 p. 228. — 
L. Pfeiffer, Monogr. Pneumon. vol. 2 p. 32; Novitates Conchol. 
