819 



the interstices cancellated ; aperture oblong-oval ; columella rather 

 straight, with an oblique, faint plait. 



An elegant, semi-transparent species, resembling an elongated 

 Adceon, with the whorls encircled with elevated cingilli, and the 

 interstices cancellated. 



Baclayon ; Philippines. (Mns. Cuming.) 



8. Monoptygma s pi rata (pi. clxxii. f. 26, 27, 28), A. Adams, 

 Pro. Zool. Soc. 1851. 



M. testa turrita, alba, epidermide fusca obtecta ; anfractibus octo, 

 planiusculis, gradatis ; sutura canaliculata ; plicis longitudinalibus, 

 angustis, confertis, et sulcis transversis decussatim ornata; aper- 

 tura oblonga ; labio plica unica obliqua instructo. 



Turrcted, white, covered with a thin brownish epidermis ; whorls 

 white, gradate, suture channelled ; whorls with decussating longi- 

 tudinal plicfe and transverse grooves ; aperture oblong ; columella 

 with an oblique fold. 



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

 brown epidermis, and with the surface of the whorls regularly 

 and beautifully decussated with raised lines. 



Camaguan, Philippines. (Mus. Cuming.) 



9. Monoptygma stylina (pi. clxxii. f. 29, 30), A. Adams, 

 Pro. Zool. Soc. 1851. 



M. testa subulata, in medio incrassata, alba, subpellucida ; an- 

 fractibus novem ad duodecim, planiusculis ; transversim tenuiter 

 striata, longitudinaliter substriata; apertura oblonga; labio su- 

 perne plica obliqua instructo ; labro, in medio, subrecto. 



A remarkable white, subulate species, with the middle whorls, 

 especially those near the apex, enlarged. 



Catanuan ; Philippines. (Mus. Cuming.) 



10. Monoptygma suturalis (pi. clxxii. f. 31, 32), A. Adams, 

 Pro. Zool. Soc. 1851. 



M. testa subulato-turrita, subumbilicata, alba, nitidis, subdia- 

 phana; anfractibus septem, planis, sutura canaliculata, :ransversim 

 sulcatis ; anfractu ultimo subsoluto, fasciis angustis, albo-articu- 

 latis, ornato ; apertura oblongo-ovali ; labio plica evanida. 



A small, white species, with the last whorl nearly free, and 

 having the suture deeply canaliculate. 



Phibppine Islands. (Mus. Cuming.) 



11. Monoptygma concinna (pi. clxxii. f. 34), A.Adams. 



M. testa ovato-turrita ; spira producta, obtusiuscula, grisca ; 



5 o 



