66 OLIVELLA. 



O. PETIOLITA, Duclos. PI. 14, figs. 61-63. 



Yellowish white, fasciculated and reticulated with chestnut- 

 color, and with a narrow chestnut revolving band upon the 

 fasciole. Length 12-18 mill. 



West Coast of America, from Panama to Mazatlan. 



Much resembles large specimens of 0. mutica, Say, var. 

 nitidula, from the West Indies ; but the markings in the typical 

 specimens are irregularly reticulated instead of zigzag. I unite 

 with it O.intorta, Carpenter (fig. 62), and 0. mica, Marrat, not 

 Duclos (fig. 63). 



Yar. AUREOCINCTA, Carp. 



Having an orange zone beneath the suture, appearing purplish 

 within the aperture. 



This zone is probably made up of fasciculations worn yellowish 

 on a beach-rolled specimen. I have not seen an authentic 

 example of it and it has not been figured. 



O. TERGINA, DUCIOS. PI. 14, fig. 67. 



Marked like Q.petiolita, but more vividly ; distinguished from 

 it by its swollen, blunt spire, and by being somewhat more effuse 



at the base.. Length, 12-15 mill. 



Acapulco, Mazatlan. 



O. PLANA, Marrat. PL 14, fig. 64. 



Shell white, solid, with a heavy callous deposit on the inner 



lip. Length, 7 mill. 



Habitat unknown. 



This may be a white variety of the last species, perhaps ; it 

 has no distinctive characters and might readily enter several 

 species. 



O. ESTHER, Duclos. PL 14, figs. 65, 66. 



Shell heavy, with short spire, and strong callus on the upper 

 part of the columella. Yellowish white, fasciculated with chest- 

 nut at the suture, with a chestnut band upon the fasciole, and 

 minute longitudinal zigzag markings of the same color upon the 



body-whorl. Length, 6 mill. 



Habitat unknown. 



A shorter, heavier form than O.petiolita, judging from the 

 figure, yet doubtfully distinct : the shells usually known under 



