282 Zoological Society. 



6. MoNOPTYGMA CASTA, A. Adams. M. testa ovato-turritd, albd, 

 tenui, semipellucidd, anfractibus convexiusculis, transversim sul- 

 catis, sulcis siihconfertis, interstitiis pulcherrime striatis ; aper- 

 turd oblongd, antice productd, columelld obliqud, subtortuosd. 



This pure white ovate form is from the China Seas, being collected 

 by the writer during the Voyage of H. M.S. Samarang. The whorls 

 are grooved, with the interstices striated. Mus. Cuming. 



7. MoNOPTYGMA SPECTOSA, A. Adams. M. testd turritd, subu- 

 latd, albidd, tenui, semipellucidd, anfractibus octo, convexius- 

 culis, suturd profunda, cingillis transversis elevatis, interstitiis 

 concinne cancellatis, ornatd; aperturd oblongo-ovali, columelld 

 subrectd, superne plied obliqud subobsoletd instructd. 



Hab. Baclayon ; PhiUppines. Mus. Cuming. 



An elegant semipellucid species, resembling an elongated Acteeon, 

 with the whorls encircled with elevated cingilli, and the interstices 

 cancellated. 



8. MoNOPTYGMA spiRATA, A. Adams. M. testd turritd, albd, 

 epidermide fusco tectd, anfractibus octo, planiusculis, gradatis, 

 suturd canaliculatd, plicis longitudinalibus, angustis, confertis, 

 et sulcis transversis decussatim ornatd ; aperturd oblongd, labio 

 plied unicd obliqud instructo. 



Hab. Camaguin ; Philippines. Mus. Cuming. 



A small turreted species, covered, in the living state, with a light 

 brown epidermis, and with the surface regularly and beautifully de- 

 cussated with raised lines. 



9. MoNOPTYGMA TENELLA, A. Adams. M. testd ovato-turritd, 



albd, subpellucidd, anfractibus quatuor, convexiusculis, trans- 

 versim tenuiter striatd; aperturd ovali, labio subrefexo, plied 

 obsoletd instructo ; labro dilatato, margine flexuoso incrassato 

 et subreflexo. 

 Hab. Philippine Islands. Mus. Cuming. 



A small J?moa-like shell, with only a faint indication of a plait on 

 the columellar lip ; the aperture dilated, and the outer lip expanded 

 and slightly thickened anteriorly. 



10. MoNOPTYGMA STYLiNA, A. Adams. M. testd subulatd, in 

 medio incrassato, albd, subpellucidd, anfractibus 9—12, planius- 

 culis, transversim tenuiter sulcata, longitudinaliter substriatd ; 

 aperturd oblongd, labio superne plied obliqud instructo ; labro, 

 in medio, subrecto. 



Hab. Catanuan ; Philippines. Mus. Cuming. 

 A remarkable white subulate shell, with the middle whorls, espe- 

 cially those near the apex, enlarged. 



11. MoNOPTYGMA suTURALis, A. Adams. M. testd subulato- 

 turritd, subumbilicatd, albd, nitidd, snbdiaphand, anfractibus 

 septem planis, suturd canalicufofd, transversim sulcata, an- 



