OL1VA. 77 



O. AVELLANA, Lam. PI. 21, fig. 90. 



White, with short triangular reddish markings, forming two 

 interrupted bands; aperture white within. Length, 30-40 mill 



New Guinea. 

 0. LECOQUIANA, Ducros. PI. 21, figs. 92, 93 ; PL 33, fig. 30. 



Shell marked and banded with chocolate-colored triangular 

 markings, as in 0. elegans, the fasciole similarly stained with 

 saffron-color ; form somewhat more bulbous ; interior of aperture 

 violaceous. Length, 35 mill. 



China 



The colored aperture is the best distinctive character. 0. 

 x/w/h's, Marrat (fig. 92), appears to be a minor form of this 

 species; and 0. calosoma, Marr., not Duclos (fig. 30), is a still 

 smaller form; 0. stellata, Duel. (fig. 93), may also probably be 

 referred here. 



0. BULBIFORMIS, Duclos. PL 21, figs. 94-96. 



Shell short and very bulbous, colored as in 0. elegans externally, 

 but the interior of the aperture chocolate-brown, or violaceous 

 brown. Length, 30 mill. 



Solomon Is.; Moluccas. 



The form is typically very distinct from all species related in 

 external coloring, 3'et I fear that it will be found to graduate 

 into the preceding species. 



O. FUNEBRALIS, Lam. PL 21, figs. 97-99 ; PL 22, figs. 100-5. 



Shell rather more cylindrical than the preceding species, with 

 the usual color-markings of the group. It differs insufficiently 

 from 0. Lecoquiana in the lower band of the fasciole being deeply 

 strigated with chocolate ; aperture white or slightly bluish or 

 chocolate within. Length, 1-1 '8 inches. 



Ceylon; Moluccas; New Guinea; Viti Islands. 



0. leucostoma, Duclos (figs. 98, 99;,0. in ornata, Mar rat (fig. 100), 

 0. propinqua, Marrat (fig. 1) and 0. /^m,Marr. (fig. 2), probably, 

 are synonyms. 



Yar. DACTYLIOLA, Duclos. Figs. 3-5. 



Shell smaller, more regularly marked with zigzag lines and 

 spots. Length, -8-1 inch. 



To this form may be united 0. picta, Reeve (fig. 4), and probably 

 0. Nanda, Marr. (fig. 5). 



