JAPANESE MOLLUSKS, NASSID^. 37 



Jraterculus. They may indeed have no especial relationship to 

 varicifera, as I have not been able to compare typical specimens of 

 that species. 



Nassa (Zeuxis) succincta A. Ad. C. Icon., f. 80. 

 Seto-Uchi, Mososeki (Ad.). 



Nassa (Zeuxis) mioans A. Ad. P. Z. S., 1851, p, 106 ; 0. Icon., f. 140 ; Ann. Mag., 

 1870, V, p. 426. 



Uraga (A. Ad.). 



Nassa (Zeuxis) clandestina A. Ad. Ann. Mag. N. H. (4), V, p. 426. 



Seto-Uchi, Idzuma-Nada, Yobuko (A. Ad.). 



Nassa luctuosa A. Ad. C. Icon., f. 109. 

 Nagasaki (Lischke). 



Nassa hypolia Pilsbry. PI. II, figs. 13, 14. 



Shell elongated, solid and thick, purplish-black with a peripheral 

 brown or whitish girdle, not glossy ; becoming ashy on the spire and 

 with age all over. Surface dull ; sculptured with numerous rounded 

 longitudinal ribs, slightly curved, a trifle more prominent at the 

 shoulder and not extending below the periphery, sometimes subob- 

 solete on the body-whorl. No spiral sculpture, or a few faint cords 

 at the base. Aperture less than half the shell's length. Outer lip 

 with a low varix, thick, with five teeth within ; throat purple- 

 black, showing the narrow light band, which on the lip spreads up- 

 ward ; below it another light blotch on the lip. Columella with a 

 white or yellow callus below, roughened by a few weak folds, and 

 with the usual posterior fold. Alt. 12'5, diam. 7 mm. Operculum 

 oval with entire edge. 



Yesso (Stearns). 



The folds are coarser and extend further down than in luctuosa 

 and succincta ; semiplicata is more strongly varixed with different 

 denticulation of the aperture ; teretiuscula differs in texture and 

 color. This species would have been included by Tryon in N. 

 gaudiosa jud gin g from what he has considered synonyms of that spe- 

 cies ; but I am by no means prepared to endorse such wholesale 

 lumping of species as that in his monograph of Nassa. 



Nassa (Demoulia) binominata Pilsbry (n. n.). 



D esmo idea jap onica A. Ad. (not Nassa japonica A. Ad.). Reeve, 

 Conch. Icon., Nassa, fig. 192. 



Japan (A. Ad.). 



