818 



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

 and the whorls are rather flattened and longitudinally striated. 

 (Mus. Cumiug.) 



5. MoNOPTYGMA AMCENA (pi. clxxii. f. 21), A. Aclmns, Pro. 

 Zool. Soc. 1851. 



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

 dinaliter substriata; anfractibus convexiusculis, trausversim sul- 

 catis, sulcis valde distantibus, interstitiis eleganter puuctatis ; 

 aperturu oblonga, anticc 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. 



BoHnao, 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, trausversim 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, convexiuscuhs ; sutura profunda, cingillis transversis 

 elevatis, interstitiis concinne cancellatis ornata ; 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 



