50 HIMA. 



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

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

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

 lunate, columella thickened but not spreading, tubercular, outer 

 lip very thick, with a thin edge near the aperture ; 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. incrassata, Mull., but I 

 have not seen any varieties 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. '3 inch. 



Southern Coast of E. Florida, West Indies. 



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

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

 identified by later investigators. Unfigured. 



N. TENELLA, Reeve. PI. 15, figs. 268, 273. 



Semitransparent orange, tinged with rose towards the apex, 

 transversely grooved, longitudinally flexuously ribbed, aperture 

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



Length, -5 inch. 



Cascaes Bay, Portugal. 



Possibly a variety of N. incrassata, vnr. pt/ytnara, which it- 

 appears to connect with the next species. 



N. CochmensiK, Thorpe, appears to be an unpublished species, 

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

 received from Mr. Sylvan us Hanley, are before me they do not 

 differ essentially from the figure of N. ienella, Reeve. -The 

 description of N. aryentea. Marrat (fig. 273 s from W. Africa, 

 agrees very well with .N. ten ell a. 

 N. DESHAYESIT, Drouet. PI. 15, fig. 209. 



Violaceous, with brown revolving, lines. Length, 15 mill. 



A 2 ore*. 

 See remark under preceding species. 



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



Yellowish brown, lower part of body-whorl and sutures 

 usually chestnut-colored. Length, 13 mill. 



Panama to Mazatlon. 



