OVULA. 247 



Fig. 17 represents the typical 0. i><it"la; iigs. 1(1, 18, the 0. 

 Adriatic a, Sowb. Additional synonyms are Bulla virginea, 

 Cantr., and Nicaenxis, Risso. 



The typical 0. patula, is the typo of the genus Simnia, Risso, 

 a liadl}* characterized group (see p. 243). 



0. LACTKA, Lam. PL 2, figs. 23-28. 



Rather solid, white, back finely transversely ribbed, with 

 several more or less distinct angles. Length, 20-25 mill. 

 East Africa, Mauritius, Japan, 



Philippines^ N. Caledonia. 



0. semistriata, Pease (figs. 25, 26), from central Polynesia, 

 appears to be only a variety having the striae a little stronger, 

 obsolete on the middle of the back. The type is a smaller and 

 more solid shell, but I have before me authentic specimens 

 which are larger, less solid and with the angles of 0. lactea. 



0. cristallina, Kiener (figs. 27, 28), is smaller and narrower 

 than the 0. lactea, but may be only a variety thereof. The 

 species has 1 not been identified by any author, and the habitat is 

 unknown. 



0. PUDICA A. Ad. PL 2, figs. 29-31. 



Pinkish white, smooth ; columella plicate below, callously 

 ridged above. Length, 18 mill. 



N. Caledonia. 



0. Caledonica, Crosse (fig. 31), appears to be a synonym. 



0. NUBECULATA, Ad. and Reeve. PL 2, figs. 41, 42. 

 Pinkish, with three clouded pink-brown bands. 

 Length, 18 mill. 



Isl. of Basilan. 

 May be only a banded variety of the preceding species. 



0. PYRIFORMIS, Sowb. PL 2, figs. 43-45. 



Yellowish white or pinkish, with three clouded darker bands, 

 extremities a little produced. Length, 21 mill. 



Australia, Japan. 



Distinguished (perhaps not sufficiently) from the preceding 

 species by its more pyriform contour and produced extremities. 

 Reeve's figure (fig. 45), probably from a worn specimen, has no 

 bands. 



