254 OVULA. 



0. SECALIS, Sowb. PL 5, figs. 28-30. 



Purplish white, extremities rather blunt, lip-margin yellowish 

 white. Length, 15 mill. 



Eastern Seas, Friendly Isles. 



The distinction between this and the preceding species is so 

 slight that I think they will prove identical. 0. seminulum, 

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



0. 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. 



O. SPELTA, Linn. PL 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 Sowerbyana, 

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

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



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



Yellowish red to purplish, smooth, extremities obtuse. 

 Length, 12 mill. 



Coast of Africa? Philippines. 



Differs subgenerically from the species which Sowerby and 

 Reeve have figured under this name, and which Weinkauff calls 

 0. Semperi. O.formicaria, Sowb. (figs. 37, 38), may be included. 



0. UNIPLICATA, Sowb. PL 5, figs. 39-50. 



Yellowish white to purplish, rather thin, transversely very 

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



