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



two fine lira? in the inframediaii space also gradually disappears or 

 attenuates on the upper whorls. 



14. Pletjrotoma TRiPORCATA. (Plate XIX. fig. 9.) 



Shell shortly fusiform, of a uniform ])ale brown or luteous tint. 

 Whorls 9, the first globular, glassy, rather large, the rest encircled 

 with three distinct keels : the uppermost is just beneath the suture ; 

 the median one (the most prominent of all) is situate in the middle 

 of the whorls, and the lowermost a little above the lower suture : the 

 interstices between the carinations are finely latticed with spiral 

 thread-like lirse and raised incremental hues ; the former are about 

 three or four in number in each of the interstitial spaces, and the 

 latter very arcuate between the central and uppermost keel, and very 

 oblique beneath the former : the body-whorl has about tvielve addi- 

 tional carinse or lirae, whereof the four uppermost are stouter and 

 further apart than those beneath. Columella a little oblique and 

 arcuate above the middle, more sloping below ; labrum thin, very 

 much produced in the middle, widely and deeply notched between 

 the terminations of the uppermost and principal keels ; canal short, 

 recurved. 



Length 14 millims., diam. 4^. 



Hab. Station 1. 



This is another species belonging to the same section of the genus 

 Plenrotoma as the three preceding. They are all sculptured with 

 the same character of ornamentation ; yet in detail it is very distinct, 

 and they also show good difTerences in the nuclear whorls. 



15. Pleurotoma PATRUELis, Smith. (Plate XIX. fig. 10.) 

 Pleurotoma ( ?) patruelis, Smith, Ann. & Mag. Nat. Hist. 



187o, vol. XV. p. 419. 



Hab. GulfofYedo, 10^ fathoms. 



The specimen from the above locality agrees precisely with the 

 tvpe in colour and sculpture, but it is rather more robust. It is 

 26J millims. long, and 8 broad. When describing this species I was 

 unable to give any account of the labrum, as, unfortunately, it was 

 broken away in the only specimen at hand. In the perfect shell 

 it is thin, prominent in the middle, and broadly sinuated at the 

 upper part in the concavity of the whorl. Columella a little oblique, 

 covered with a callosity, thickest towards the base. Operculum sub- 

 ovate, concentric, nucleus subcentral, but rather towards the inner 

 or columellar side (fig. 10 a). 



16. Pleitrotoma coNsiMiLis. (PlateXIX.fig.il.) 



Shell ovately fusiform, turreted, pale fleshy brown. Whorls 8 ; the 

 first globidar, glassy, smooth, the rest concave above, angled at the 

 middle and a little concave below the angle, longitudinally flexuously 

 obsoletely plicated ; plicse obsoletely nodulous above at the suture, 

 bearing larger nodules at the angle and two smaller ones beneath it ; 

 nodules connected by spiral lirse between the plicae, which are coarser 

 than other intermediate fine spiral lirations ; the last whorl encircled 



