7fi OLTVA. 



The markings are similar to varieties of the preceding species, 

 from which it is somewhat doubtfully distinguished by its less 

 inflated form, spire not so much sunken, fasciole without the 

 callous ridge, etc. As in inflata, the color varies, but not so 

 frequently, perhaps; I figure a dark-hued specimen (fig. 78). 

 0. glandiformis, Marr. (fig. 80), is at least identical as to the 

 figure I copy ; the two additional figures given by Marrat appear 

 to be more similar to 0. elegans, Lam. 



0. ELEGANS, Lam. PL 20, figs. 81-83 ; PI. 21, figs. 84-88. 



Shell olive, or brownish yellow, closely covered with zigzag 

 lines or punctations, or both, varying from chocolate to nearly 

 black, and frequently shaded with orange, and bluish ash ; some- 

 times there is an overlaid darker series of crowded zigzags 

 forming two irregular bands, or even almost cavering the shell ; 

 fasciole tinged with saffron-color. Length, 1'5-1'75 inches. 



Indian Ocean to Central Polynesia. 



Generally smaller, darker-colored and not so much inflated as 

 0. tigrina, but I have hesitated long whether to treat it as a 

 synonym of that species or as distinct ; its characteristics are 

 certainly insufficient. I am compelled to place here as synonyms 

 several so-called species which have heretofore been considered 

 distinct, but the large number of specimens before me covers 

 every grade of variation between them ; the tinted fasciole 

 appears to be a feature common to all. These synonyms are 

 0. flava, Marr. (fig. 83), 0. infrenata, Marr. (fig. 84), and 

 0. Hemiltona, Duclos (fig. 85). 



Var. TRICOLOR, Lain. Figs. 85-88. 



The zigzag painting is more or less broken up into spots, and 

 is blue, olive or chocolate shaded with orange, disposed upon a 

 light ground. This has usually been considered a distinct 

 species, but is connected with the type by insensible gradations. 

 0. tringa, Duclos (fig. 88), is probably the young state. 



0. CALOSOMA, Duclos. PI. 21, fig. 89. 



Pure white, or with slight indications of three bands composed 

 of occasional triangular brown markings. Length, 27 mill. 



China. 



