254 OVULA. 



0. SECALTS, Sowb. PI. 5, figs. 28-30. 



Purplish white, extremities rather blunt, lip-margin yellowish 

 white. Length, 15 mill. 



Easlc.ru Xf.iis, Friendly Isles. 



The distinction between this and the preceding species is so 

 slight that 1 think they will prove identical. (>. wimmilum, 

 Sowerby (fig. 30), from Friendly Islands, is a synonym. 



O. BORBONICA, Desh. PI. 5, fig. 31. 



Rosy white, ventricose in the middle, thin, translucent, trans- 

 versely striate, aperture very narrow. Length, 7 mill. 



Isle of Bourbon. 

 I am not acquainted with this species. 



0. ACUMINATA, Ad. and Reeve. 



Rather stout, yellowish white, lip thickened. Length, 8 mill. 



East Indies, Japan. 

 Perhaps a small variety of the preceding species. 



0. SPELTA, Linn. PI. 5, figs. 32, 33. 



Whitish or flesh-color, smooth, polished, aperture rather wide 

 anteriorly, lip-margin and extremities of shell callously thick- 

 ened. Length, 15-20 mill. 



Mediterranean Sea, Canary Is. 



This is not 0. spelta of Sowb. and Reeve (see Sowerbymm, 

 above). The synonymy includes 0. hordacea, Costa; 0. pur- 

 purea, Risso, and 0. Leathesi of Wood's Crag Mollusca. 



0. HORDACEA, Lamarck. PI. 5, figs. 34-38. 



Yellowish red to purplish, smooth, extremities obtuse. 

 Length, 12 mill. 



Coast of Africa? /V//7 //>/>/ m-s. 



Differs subgenerically from the species which Sowerby and 

 Kceve have figured under this name, and which Wcinkaulf calls 

 0. Semperi. O.jormicariu , Sowb. (ligs. :>7, 38), may be included. 



O. UMIM.H ATA, Sowb. PI. 5, figs. 39-50. 



Yellowish white to purplish, rather thin, transversely very 

 minutely incised, or smooth, polished ; narrow, with the cxtivm- 



