1H OLTVA. 



O. MUSTELLINA, Laiii. PI. 22, figs. 6-14. 



Cylindrical, the aperture long and narrow, the spire very short, 

 sharp-pointed; pale ^^ellowish, covered with light chestnut ful- 

 gurations, interior deep violet. Length, 1-1-25 inches. 



Singapore ; Japan. 



Distinguished at once by its cylindrical form, light coloring, 

 and violet interior. The following ma}^ be considered synony- 

 mous, being mostly slight variations in form, or dead and faded 

 specimens: 0. caroliniaim^'Dviclos (fig. 7), 0. anguf<tata, Marr. 

 (fig. 8), 0. Isevis, Marr. (fig. 9 , probably, 0. scitula, Marr. (fig. 10), 

 0. grata, Marr. (fig. 11), 0. Paeifica, Marr. (fig, 12), 0. arctata, 

 Marr. (fig. 13), and 0. cana, Marr. (fig. 14). Possibly 0. neostina, 

 Marrat, not Duclos, and 0. Jayana, Ducros, also belong here. 



O. NEOSTINA, Duclos. PI. 22, figs. 15-20. 



Somewhat less cylindrical than 0. mustelUna and larger; color 

 varying from light yellowish white to chocolate, the lighter 

 varieties with zigzag brown lines ; aperture white or slightly 

 bluish within. Length, l-25-l'5 inches. 



Anstralia ; New Guinea. 



This bears some resemblance to the preceding, and is more 

 closely related to the following species, of which it may possibly 

 be a minor variety. I am not at all satisfied as to its claim to 

 distinctness. 0. Octavia, Duclos (fig. 15), is usually considered 

 synonymous. 



0. MAURA, Lam. PI. 23, figs. 21-26 ; PI. 1, fig. 5 ; PI. 34, fig. 54. 



Light olivaceous, orange-brown, chestnut or chocolate, some- 

 times nearly black, often more or less distinctly banded with 

 lines of dilferent shades of the same color, the lighter-colored 

 specimens especially, frequently marked with chestnut zigzag 

 lines and spots; interior of aperture and columella white; fasciole 

 mostW colored with the prevailing tint. 



Length, l"75-2'25 inches. 



Indo-Pacijic and Austro- Pacific Provinces. 



One of the commonest and most variable species of the genus. 

 It may be distinguished from 0. tigrina, which it often resembles 

 greatly in painting, by its larger size and more cylindrical form. 

 Fig. 26 represents 0. 3Iacleai/a, Duclos. 



