152 Mr. G. B. Sowerby on the 



plicato-dentieulato ; columelld superne dente pliciformi valido, prope 

 basin depressd, infrcL uniplicatd ; marginibus externis labiorum au- 

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

 Hah. . Mus. nost. 



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

 mities, 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 vdth 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 0. 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. iestd ovatd, subgibbosd, Icevi, candidd; labii externi margine inter- 

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

 \i,poll. 

 Hab. ad littora Insularum Oceani Pacific!. 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 plicse ; inner edge of the columella ratlier compressed, particularly 

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

 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. 



O. testd ovali, utrinque obtusd, brevi, albd; labii externi margine intits 

 denticuhtoj coltimelld superne uniplicatd, extiis marginatd, prope 



