212 MR. E. A. SMITH ON MOLLUSCA FROM JAPAN. [Feb. 18, 



Adams's description is far too brief and vague for identification of the 

 species, I am induced to retain the name tenuis imposed upon it by 

 myself in the Annals of 18/5. 



74. Nassa (Hima) AcuriDENDATA. (Plate XX. fig. 46.) 

 Shell ovate, acuminated above, thick, reddish brown v?ith a white 



zone round the middle of the upper whorls and two on the last, and 

 again pale at the extremity. Volutions 7 ; two embryonal smooth, 

 mamillar, convex ; the rest a httle convex, divided by a deep and 

 almost channelled suture, ornamented with longitudinal ribs (18 on 

 the penultimate whorl) and transverse Urse, which are granuliferous 

 upon the costae ; they are usually four in number upon the upper 

 whorls ; but in some instances a fifth finer one is observed just be- 

 neath the suture ; on the last whorl there are nine or ten granulous 

 ones, then about five simple oblique ridges on the extremity or short 

 Cauda, whereof the uppermost is the stoutest and carinseform. 

 Aperture small, ovate, whitish, with three dark brown bands with- 

 in, one central, one superior, and the other at the basal extremity 

 corresponding to the exterior banding of the whorl ; labrum with 

 an exterior varix, and armed within at a little distance from the 

 extreme edge with 5-6 denticles, whereof one, the fourth from the 

 base, is conspicuously larger than the rest and rather acute, and the 

 one or two above that are more or less obsolete ; columella much 

 arcuated, coated with a small thin callus, thickened at its edge, bear- 

 ing at the upper part a lirseform tubercle and four or five smaller 

 ones beneath it. 



Length 10 millims., diam. 4 J. 



Hab. Stations 5 and 8*. 



This species is painted very much in the same manner as N. tenuis. 

 It differs, however, from that species in the smaller number of the 

 whorls, in form, and the character of the aperture and its armature. 

 Twelve specimens were examined. 



75. Nassa (Hima) luteola. (Plate XX. fig. 47-) 



Shell small, elongate, yellow ; whorls 6 ; the two nuclear 

 globose, the rest convex, costate, and transversely lirate ; coslse 

 twenty in number on the penultimate volution, a little oblique ; lirse 

 nodulous on the ribs, four to five on the upper whorls, six on the 

 penultimate, and about eleven on the last, the cauda of which is 

 grooved. Aperture small, ovate, yellow ; lip exteriorly variced, thin at 

 the margin, and lirate within ; columella considerably arched, covered 

 with a callosity, bearing a tubercle above and exhibiting traces of 

 another below. 



Length 7 millims., diam. 3^. 



Hab. Station 7. 



This little shell, of which there is but one in the collection, is 

 chiefly characterized by its diminutive proportions and the unifor- 

 mity of coloration. The tuberculation upon the columella is hardly 

 definable, and probably has been absorbed by the little Payurus in- 

 habiting the shell. 



