152 Mr. G. B. Sowerby on the 



plicatO'denticulato ; columelld supernk dente pliciformi valido, prope 

 basin depressd, infrd unipUcatd ; marginibus exiemis lahiorum au- 

 rantiaco-marginatis; long. \^, lat. y%, poll. 

 Hah, . Mus. nost. 



Desc. Shell of a rather oblong oval form, and obtuse at both extre-' 

 raities, white, particularly the front ; the back with a number of slightly 

 raised transverse lines ; border of the outer lip rounded, denticulated on 

 the inner edge, depressed and plicato-denticulated near the lower end ; 

 upper part of the columella with a strong pliciform tooth ; near the base 

 it is depressed, and below it has a prominent fold or tooth ; outer bor- 

 ders of the lips with an orange margin. 



An interesting species, much resembling O. pyriforme in general ap- 

 pearance ; by attention to its peculiarities noticed in the description, it 

 will be easy to recognize it. A single specimen was found in Mr. G. 

 Humphrey's collection, without any information respecting its locality. 



OVULUM LACTEUM, 



Lam., Anim. sans. vert. VII. 388. 



O. testd ovatd, subgibbosd, IcBvi, Candida; lahii extemi margine intei'- 

 no plicato-denticulato ; columelld ad basin compressd ; long. |^, lat. 

 U^polL 

 Hah. ad littora Insularum Oceani Pacifici. Mus. Goodall, Mawe, nost. 



Desc. Shell ovate, slightly gibbose, smooth, white, back with a few 

 slight transverse angular lines ; edges thickened ; inner edge of the outer 

 lip denticulated, the teeth somewhat extended outwards in the form of 

 short plicae ; inner edge of the columella rather compressed, particularly 

 near the base ; canals very short, that at the base produced by a phciform 

 tooth at the base of the columella. 



Rather a rare species which has occasionally been brought from the 

 Islands of the South Seas, as well as from Haynam and Timor. It sel- 

 dom reaches the size of our specimen, but its proportions are not subject 

 to variation. 



OvULUM BREVE. 



0,lestdovali, utrinque ohtusd, hrevi, alhd; lahii externi margine inti^s 

 denticulato; columelld superne unipUcatd, extils marginatd, prope 



