OVULA. 251 



0. EMARGINATA, Sowb. PI. 3, figs. 83, 84. 



Flesh-white or whitish, the ridge sharper than in the preceding 

 species and white, lip heavily margined, also white, extremities 

 rostrate, narrower. Length, 1 inch. 



Panama. 



The back is often finely transversely striate. 



O. INTERMEDIA, Sowerby. PL 3, figs. 85, 86. 



Rather solid, smooth, polished, whitish or tinged with yellow- 

 ish brown ; back gibbous, with faint indication of a transverse 

 ridge or angle, and often showing a still fainter anterior one; 

 extremities narrowly produced ; lip strongly margined, scarcely 

 dentate ; columella with a callous posterior plication. 



Length, 1-1-5 inches. 



Brazil, West Indies. 



Smaller specimens show the angle very plainly; sometimes in 

 these it is consp'cuously slrtrp. The shell connects this group 

 with Neosimnin in such manner that it is difficult to decide where 

 it ought to be placed. 0. oblonga of Martini, and 0. spelta, 

 Dillwyn, are synonj'ms. 



0. OBTUSA, Sowb. PL 3, figs. 8*7-89. 



Yellowish- or pinkish-white, obtusely angulated on the back, 

 extremities produced, lip callously margined. Length, 16 mill. 



China, Japan. 



Something like a miniature 0. intermedia. 0. Indica, Reeve, 

 (fig. 89), from Bombay, appears to be a minor form. 



0. TRAILLT, A. Ad. PL 3, figs. 90, 91. 



Flesh-colored, smooth, back strongly angularly gibbous, ex- 

 tremities narrowly produced. Length, 11 mill. 



Malacca. 

 0. FORMOSA, Adams and Reeve. PL 4, figs. 15, 16. 



Gibbous, slightly angnlated across the back, transversely striate, 

 purplish orange, the extremities orange-tipped ; aperture narrow, 

 but little widened below, the columella callous above, the outer 

 lip-margin conspicuously dentate. Length, 12 mill. 



Borneo, Japan. 



0. SEMPERI, WeinkaurT. PL 4, figs. IT, 18 ; PL 5, fig. 19. 



Purplish yellow or orange-red, the margin orange-red ; back 



