OLIVELLA. 07 



this name are certainly 0. petiolita. 0. columba, Duclos (fig. 

 66), may be considered an uncolored variety of this species. 



O. ZONALIS, Lam. PL 15, fig. 69. 



White, with three chestnut revolving bands, about same width 



as the interspaces. Length, 5-6 mill. 



Mazatlan . 



0. zanoeta, Duclos (fig. 69), appears to be a larger specimen or 

 magnified figure of this species. 



O. COLUMELLARIS, Sowb. PI. 15, figs. 70-73. 



Acuminately ovate, the spire exserted, base broadly effused ; 

 columellar lip with heavy callus extending to the top of the 

 body-whorl ; commencing at the suture are a number of close, 

 fine, longitudinal striae, which extend longitudinally to near the 

 centre of the body-whorl, where they become obsolete, and the 

 rest of the whorl is polished ; spire and fasciole white, body- 

 whorl almost covered by three broad chestnut or plum-colored 

 bands, the two dividing interspaces of yellowish white being 

 quite narrow. Length, 12-15 mill. 



Payta, Peru, in fiue sand at low water (Cuming); 



W. Columbia; Panama. 



0. semistriata, Gray (fig. 71), O.attenuata, Reeve (fig. 72), and 

 0. affinis, Marrat (fig. 73), are synonyms. 



0. NIVEA, Gmelin* PI. 15, figs. 74-88. 



Acuminately oblong, the spire much exserted ; body-whorl 

 fasciculated with pink at the suture and at the border of the 

 broad fasciole, with pink maculations, more or less distinct 

 upon the intermediate surface. Length, *6-'9 inch. 



Bahamas ; West Indies ; Brazil. 



Distinguished from 0. mutica, Say, by its larger size, more 

 elevated spire, and (usually) maculated instead of zigzag mark- 

 ings. The synonymy is enormous, including 0. eburnea, Lam., 

 0. parvula, Mart. (fig. 75), 0. oryza, Lam. (founded on immature, 

 colorless examples), 0. Guildingi, Reeve (fig. 76), 0. monilifera, 

 Reeve (fig. 77), '0. pulchella, Reeve (fig. 78), 0. dealbata, Reeve 

 (fig. 79), 0. rubra, Marrat (fig. 80), 0. fulgida, Reeve (fig. 81), 

 0. inconspicua, Marrat (fig. 82), 0. JReevei, Ducros (fig. 83), 

 0. diadocus, Ads. and Reeve (fig. 84), 0. cuneata, Marr. (fig. 85), 

 having a more than usually produced spire, O. scurra, Marr. 



