282 ONTSCIA. 



t 



marbled and reticulated with chestnut or chocolate and white, 

 interior white or sometimes bright saffron-colored. 



Length, 1-25-1-5 inches. 



Galapagos Js., Mazatlan, La Paz, L. C. 



0. xanthostoma, A. Ad., is a synonym, being the variety with 

 yellow aperture. 



0. STROMBIFORMIS, Reeve. PI. 4, fig. 70. 



Spire elevated, pointed, whorls angulated above, encircled by 

 numerous narrow nodulous ridges ; columellar lip minutely 

 granulated, outer lip ridged within, with a short interrupted rib 

 in the interstices ; white, dotted and spotted with chestnut, lips 

 white. Length, 22 mill. 



West Indies. 



I have not seen this species. 



Section II. ONISCIDIA, Swainson, 1840. 

 O. DENNISONI, Reeve. PI. 10, fig. 20. 



Whorls angulated above, longitudinally compressly plicated, 

 crossed and cut into short spines by numerous revolving riblets; 

 columellar lip minutely granulated, outer lip irregularly denticu- 

 lately ridged ; whitish, obscurely three- or four-banded with 

 chestnut, lips orange-red, with the granules and plications 

 whitish. Length, 2 inches. 



Guadeloupe, W. I. (Beau). 



I find no other authority for the habitat of this very beautiful 

 species. 



O. CANCELLATA, Sowb. PI. 10, fig. 21. 



Whorls rounded above, longitudinally narrowly plicated, 

 decussated by regular equidistant revolving riblets, the inter- 

 stices spinose ; whitish or brownish white, three-banded with 

 light chestnut, aperture white. Length, 1-5-2-5 inches. 



China. 

 0. EXQUISITA, Ad. and Reeve. PL 8, fig. 100. 



Whorls shouldered, encircled by rows of papillary tubercles, 

 with intervening ridges; whitish, sparingly dotted, and behind 

 the lip three-spotted with orange-brown, lips pink, the granules 

 and plications white. Length, 1*5 inches. 



Sooloo Sea; Australia. 



0. ponder osa, Hanley (PI. 10, fig. 22), is a synonym. 



