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., 18Jl, p, 106 ; C. 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 ; seviiplicata 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. 

 ^aw(itosa judging 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.). 



Desmoulea japonica A. Ad. (not Nassa japonica A. Ad.). Reeve, 

 Conch. Icon., Nassa, fig, 192. 



Japan (A. Ad.). 



