818 



at Bolinao, Philippines, by Mr. Cuming ; the outline is subulate, 

 and the whorls are rather flattened and longitudinally striated. 

 (Mus. Cuming.) 



5. Monoptygma amcena (pi. clxxii. f. 21), A. Adams, Pro. 

 Zool. Soc. 1851. 



M. testa ovato-acuminata, tenui, subpellucida, albida, longitu- 

 dinaliter substriatfi; anfractibus convexiusculis, transversim sul- 

 catis, sulcis valde distantibus, interstitiis eleganter punctatis ; 

 apertura oblonga, antice dilatata ; columella recta. 



Ovately acuminated, thin, rather pellucid, white, longitudinally 

 somewhat striated; whorls rather convex, transversely sulcated, 

 grooves very wide apart, interstices elegantly punctate ; aperture 

 oblong, anteriorly dilated ; columella straight. 



This is a most exquisite species both in form and sculpture ; 

 the whorls are rounded and punctate-striate, and the shell is nearly 

 pellucid. 



Bolinao, Philippines; ten fathoms. (Mus. Cuming.) 



6. Monoptygma casta (pi. clxxii. f. 22), A. Adams, Pro. 

 Zool. Soc. 



M. testa ovato-turrita, alba, tenui, semipellucida ; anfractibus 

 convexiusculis, transversim sulcatis, sulcis subconfertis, interstitiis 

 pulcherrime striatis ; apertura oblonga, antice producta ; columella 

 obliqua, subtortuosa. 



Ovately turreted, white, thin, semipellucid ; whorls rather 

 rounded, transversely grooved, grooves rather close together, 

 interstices very beautifully striated; aperture oblong, anteriorly 

 produced ; columella oblique, somewhat tortuous. 



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

 lected by the writer during the voyage of H.M.S. Samarang. 

 The whorls are grooved, with the interstices striated. (Mus. 

 Cuming.) 



7. Monoptygma speciosa (pi. clxxii. f. 24, 25), A. Adams, 

 Pro. Zool. Soc. 1851. 



M. testa turrita, subulata, albida, tenui, semipellucida ; anfrac- 

 tibus octo, convexiusculis; sutura profunda, cingillis transversis 

 elevatis, interstitiis concinne cancellatis oruata ; apertura oblongo- 

 ovali, columella subrecta, superne plica, obliqua, subobsoleta, in- 

 structa. 



Turreted, subulate, white, thin, semipellucid; whorls eight, 

 rather convex ; suture deep, with transverse elevated ridges, with 



