— 34 — 



Nur ein Exemplar von Halmahera, tot gesammelt und ohne Deckel, aber doch wohl 

 zweifellos ein Pteroojdus, der erste Vertreter dieser Gattung von den Molukken. 



2. Pterocyclus tenuilabiatus Metcalfe. 



Cyclostoma tenuilabiattmi Metcalfe, Proc. Zool. Soc' London 1851, p. 71. — Pterocyclus t. 

 Pfeiffer, Monogr. Pneum. I, p. 45. — Reeve, Concholog. icon. sp. 5. — Martens, Ostas. Zool. 

 Moll., p. 114. 



Nur ein verbleichtes Exemplar aus der Minahassa. 



3. Pterocyclus niahe?isis God win-Austen, var. baramensis m. 



Tafel 4, Figur 1. 



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

 incrementi subcostiformibus obliquis sculpta, sub epidermide crassiuscula fusca strigis ful- 

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

 sutura i)rofunda discreti, regulariter sed celeriter crescentes, ultimus ad peripheriam sub- 

 angulatus, ad angulum lira distincta munitus, supra liris 4 obtusis, aperturam versus dis- 

 tinctioribus cinctus, infra lineis elevatis nonnullis minus distinctis, dein laevis, ad aperturam 

 leniter descendens. Apertura perobliqua, circularis; peristoma duplex, internum continuum, 

 porrectum, leviter expansum et subreflexum, lutescens, sulco perpi'ofundo ab externo discretum ; 

 externum magis obliquuni, album, tenue, ad suturam sinulum perprofundum fere tubuliformem 

 formans, dein depressum, ad dextram valde expansum et reflexum, ad columellam angustatuni. 



Diam. maj. 26, min. 21, alt. 10 mm. 



Pterocyclus niahensis Godwin-Austen, ' Proc. Zool. Soc. London 1889, p. 340, t. 35, fig. 3. 



Gehäuse sehr weit und perspektivisch genabelt, niedergedrückt, fast scheibenförmig, 

 festschalig, dicht und schief rippenstreifig, unter einer dicken, braungelben, leicht gefältelten 

 Epidermis braun mit schmalen, weifsen, ziemlich regelmäfsig gestellten Zickzackstriemen, 



' Shell dextral, discoid, very widely perspectively umbilicated; sculpture a tliick epidermis, crossed 

 by streng lines of growth; colour umber-brown, with narrow ziczac markiugs crossing the whorls at regulär 

 intervals; apex not raised above the succeeding whorls; suture shallow; whorls 5, subangulate at the 

 perlphery, with a raised rib upon it. two similar less defined ribs above and three on the underside; aper- 

 ture circular, very obliciue; peristome double, inaer continuous simple, the outer much expanded and reflected, 

 particular on the upper margin, where it forms one strong sutural fold, which a very slight further deve- 

 lopment would convert into a tube, it then falls over in front foriuing a frontal läppet, with sinuate edge. — 

 Size: maj. diam. 27,75, min 23, alt. axis 5,5, body whorl 11,5 mm. 



