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



spiral ridges, subequidistantly placed, of a rich reddish-brown 

 colour. The operculum is typically fusoid, having a terminal nucleus, 

 and differing in this respect from that of -S. cassidaricefornm, thus 

 showing how yariable and unreliable the operculum is as a divisional 

 character. 



56. EuTHRiA FERREA, Rceve. (Plate XX. figs. 39, 39a.) 



Buccimim ferreum. Reeve, Conch. Icon. iii. 18-17, p. 102. 



Tvsus viridulvs, Dunker, Moll. Japon. 1861, p. 3, pi. 1. f. 16 ; 

 Lischke, Jap. Meer.-Conch. i. pi. 5. f. 5, 6 ; Smith, Ann. & Mag. 

 Nat. Hist. 1875. 



Ilab. Stations 8* and 28. " Tsu-Sima, 0-Sima, and Nagasaki 

 {A. Ad.) ; Decima and Nagasaki (Lischke). 



The type of this species is in a worn condition, and entirely desti- 

 tute of the olivaceous epidermis exhibited by fresh specimens. How- 

 ever, there is not a shadow of doubt that it is identical with the 

 shell described by Dunker as Fusiis viridnlus. It is a species subject 

 to considerable variation in fornij some examples being considerably 

 more robust than others. Its operculum is typically fusoid, with an 

 apical nucleus. 



57. Tritonidea subrubiginosa. (Plate XX. fig. 40.) 



Shell ovate, dark brown, with a luteous band around the middle 

 of the last whorl, wliich is also partly seen upon the upper whorls 

 just above the suture ; tip of the body- whorl luteous. Volutions 6^, 

 the one and a half at the apex smooth ; the rest very convex, 

 obliquely plicated and spirally ridged ; plicae or costee large, swollen, 

 broader than the interstices, ten in number on the penultimate 

 whorl ; transvcre lira3 four or five on a whorl, with finer intermediate 

 ones, a trifle thickened upon the plicae ; the latter become obsolete 

 upon the last whorl about the periphery. It is encircled throughout 

 hj spiral ridges, some of which at the basal extremity and between 

 the strong ones above are very fine. Aperture occupying rather less 

 than half the entire length, livid blue within ; labrum thickened ex- 

 teriorly witli a large tumid varix, thin and crenulated at the margin, 

 armed within with about eight lirre, which are thickest at the end 

 towards the lip ; columella covered with a thin callus, arcuate above, 

 with a somewhat dentiform prominence at the middle, and one or 

 two tubercles close to it, and another small elongate one above close 

 to the termination of the outer lip ; canal oblique. 



Length 17 millims., diam. 7. 



Hab. Station 8*. 



This interesting little shell might, at first glance, be mistaken for 

 a diminutive form of Buccitium rubiginosum. Reeve. It is, how- 

 ever, distinguished by fewer Avhorls, whereof the nuclear ones are 

 actually larger than those of T. rubif/inosa, and also by difference of 

 coloration and the shorter aperture. The operculum is fusoid, with 

 the nucleus terminal. 



