orisTHOPORUS. 27 



4. O. tiabuliferiis Pfi*. 



T. late umbilicata, depressa, striatula, opaca, albida, flam- 

 mis angulosis fuscis picta; spira vix elevata, fusco-violacea, 

 vertice subacute prominente; sutura subprofunda; anfr. 4'/2 

 convexiusculi , ultimus teres, antice breviter solutus, vix de- 

 scendens, 2 mill. pone aperturam tubulo brevi a sutura antror- 

 sum subascendente munitus; apertura diagonalis, circularis; 

 perist. duplicatum: internum continuum, porrectum, externum 

 marginibus supero et dextro breviter patens, sinistro obsole- 

 tum. — Operc? — Diam. maj. IGi/o, min. 13, alt. 6^/3 mill. 

 Ap. diam. G mill, (Mus. Cuming.) 



Cyclostoma tuhuUferum (Cyclotus) Pfr. in Proc. Zool. Soc. 1853. p. 5l. 



Cydotus tuhulifcrus Pfr. m Malak. Bl. 1854. p. 81. 



Opistkoporus tubulifcrus Jic7is. in Ann. and Mag. 2d. ser. XV. p. 14. 

 _ _ H. et J. Adams Gen. rec. Moll. II. p. 277. 



Habitat . . .? 



5. O. birostris Pfr. 



T. umbilicata, depressa, subdiscoidea, solidula, irregula- 

 riter striata, fulvo-lutea, fascia peripherica castanea et superne 

 strigis latis angulatis ornata; spira plana, vertice subtili, vix 

 prominulo; anfr. fere 5 convexiusculi , rapide accrescentes, 

 ultimus teres, subtus obsolete maculatus, antice solutus et 

 tubulo antrorsum curvato munitus ; umbilicus latus , anfractus 

 onines latiores et convexiores monstrans quam superne; aper- 

 tura diagonalis , circularis ; perist. duplex : internum breve, 

 rectum , externum expansum et inflexum , superne in rostrum 

 apertum , anfractum ultimum tangens , productum. — Operc. 

 album, arctispirum, extus concavum. — Diam. maj. 26, min. 

 19, alt. 7 mili. Ap. intus 7 mill. diam. (Coll. Nr. 35.) 



Cyclostoma biroslrc (Cyclotus) Pfr. in Proc. Zool. Soc. 1854. p. 300. 

 Habitat Sarawak, Borneo. 



6. O. |»terocycloi«l«s Pfr- 



T. umbilicata, depressa, subdiscoidea, solidula , striatula 

 et striis spiralibus sub lente decussata, lutea, strigis angulatis 

 castaneis picta; spira plana, vertice mucronatim prominulo; 

 anfr. 5 rapide accrescentes, parum convexi, ultimus depresso- 

 rotundatus, antice solutus et spiraculo antrorsum vix ascen- 

 dentc munitus; umbilicus profundus, '/3 diametri superans; 

 apertura diagonalis , circularis ; perist. duplex : internum vix 

 porrectum, superne leviter emarginatum, externum dilatatum, 

 rectangule patens, limbo subinflexo, superne subangulatim pro- 



