727 



10, Pterocyclus niahensis baramensis Kobelt. 



Taf. 105. Fig. 7-9. 



Testa latissime et perspectiviter umbilicata, depressa, fere discoidea, solida, lineis in- 

 crementi subcostiformibus obliquis sculpta, sub epidermide crassiuscula fusca strigis fulguratis 

 angustis regularibus albis ornata. Spira plana, apice parvo. Anfractus 5 convexi, sutura 

 profunda subcanaliculata discreti, regulariter sed celeriter accrescentes, ultimus ad peripheriam 

 subangulatus, ad angulum lira distincta niunitus, 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 subrefiexum, lutescens, sulco perprofundo ab externo discre- 

 tum; externum 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 

 & Möilendorff, 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. Pterocyclus cetra Benson. 



Taf. 105. Fig. 10-12, 



Testa late umbilicata, orbiculato-depressa, capillaceo-striatula, luteo-cornea, 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 subaequanteni 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. 



