50 HIM A. 



whorl, the other near the canal at the base, whorls ratlier flattened, 

 ribbed to the liase in front and not more than half-way down 

 behind, raised into blunt nodules at the sutures, aperture semi- 

 lunate, columella thickened but not spreadino-, tu1)ercular, outer 

 lip very thick, with a thin edge near the ajjcrture ; throat with 

 rather strong and somewhat distant ridges, canal very short, 

 stained on each side of the base with brown. This may be only 

 a variety of that interminable shell. N. incraasata^ MiilL, but I 

 have not seen any A-arieties that are likely to connect them. 



The above is Marrat's description ; no figure, dimensions or 

 locality. 

 N. ALBA, Say. 



Shell white. L. -45. lat. -8 inch. 



Southern Coast of E. Florida, West Indies. 



The sculpture of this species is said to be similar to that of 

 N. incrassain, with which Say compares it. It has not been 

 identified l)y later investigators. I'nfigurcd. 



N. TENELLA, Recvc. IM. l.T, tigs. 268, 273. 



Semitransparent orange, tinged with rose towards the apex, 

 transversely grooved, longitudinally flexuously ribbed, aperture 

 small, columella callous, lip thickly varicose, varix white. 



Length. •') incli. 



Cascues Brtt/, Portugal. 



Possibly a variety of N. vicrasnata, var. pi/finiHO., which it 

 appears to connect witli the next species. 



N. Cochinensifi, Thorpe, appears to be an unpublished species, 



although alluded to by Mr. Marrat ; sjiecimens under that name 



received from Mr. Sylvanus Hanley, are before me — they do not 



differ essentially from the figure of N. tenella, lleexe. The 



description of X. ariientt'o, Marrat (fig. 273), from W. Africa. 



agrees very well with X. toieJId. 



N. Deshayesii, Drouct. I'l. In, fig. 2(U». 



Violaceons, with l>ro\vn revolving lines. I^ength, 15 mill. 



Azores. 

 See remark under preceding species. 



N. VERSICOLOR, C. B. Ad. PI. 15, figs. 270-272, 275. 



Yellowish brow^n, lower part of body-whorl and sutnres 

 nsually chestnut-colored. Length, 18 mill. 



Panama to Mazatlan. 



