250 OVULA. 



moderately thickened ; aperture curved, rather broad, columella 

 scarcely plicated. Length, 8 mill. 



New Caledonia. 



A delicate, rather inflated bubble-shaped shell, elaborately 

 sculptured with engraved stride. The foregoing is Reeve's 

 diagnosis, the species being unknown to me. It is 0. marginata 

 of A. Ad., not Sowerby, and changed by Eeeve as above. 



0. BULLATA, Ad. and Reeve. PI. 3, figs. 67-70. 



Pinkish or purplish or yellowish white, somewhat gibbous on 

 the back which is smooth or transversely incisely striated ; lip 

 strongly margined, flesh-brown, somewhat squarely produced at 

 the extremities. Length, 8 mill. 



Singapore, Japan, New Caledonia. 



0. scitula, Ads. (figs. 69, 70), is a synon} r m. 



0. STRIATULA, Sowerby. PI. 3, figs. 75-80. 



Back strongly angularly gibbous in the middle, attenuately 

 produced at the extremities, striate or smooth ; lip strongly 

 margined ; pinkish- or yellowish-white. Length, 10 mill. 



Straits of Malacca, Loo Choo Is., Philippines, Japan. 



I unite with this 0. dorsuosum, Hinds (figs. 77, 78), and 

 0. dentata, Ad. and Reeve (figs. 79, 80). The following species 

 is also probably a synonym. 



0. FRUMENTUM, Sowerby. PL 3, figs. 71, 72. 



Smaller than the preceding, of which it may be a variety ; the 

 form is similar, but the back does not show the angle, although 

 evidently gibbous. Length, 6 mill. 



Hab. unknown. 

 Subgenus CYPHOMA, Bolten, 1798. 



0. GIBBOSA, Linn. PI. 3, figs. 81, 82. 



Rather thick, smooth, polished ; pale straw-color or whitish, 

 stained on the sides with fawn-color; extremities obtuse; lip 

 callously margined, scarcely dentate. Length, 1-1 '25 inches. 



Florida, West Indies. 



Lamarck probably confounded 0. intermedia, Sowb., with this 

 species in giving Brazil as habitat, and Cuming in referring it to 

 Panama very likely mistook the next species for it. It is 

 0. pharetra of Perry and 0. dorsata, Bolten. 



