1881.] THE SURVEY OF H. M.S. ' ALERT.' 29 



dinally plicated, spirally ridged, and everywhere ornamented very 

 beautifully withvery numerous close raised lamellae or lines of growth. 

 The longitudinal folds or costse are oblique, attenuated above, and 

 rapidly widening inferiorly ; they number 9-10 on the penultimate, 

 and about one more on the last whorl, on which, a little below the 

 middle, they become obsolete. The spiral liras are for the most part of 

 about equal thickness, and vary in number from about 7 to 9 on the 

 upper volutions, and from 1 6 to 20 on the last ; the one at the extremity, 

 which, as it were, forms the cauda, is twice or thrice as thick as the 

 rest. Aperture ovate, white, together with the canal occupying 

 rather more than half the entire length. Columella arcuate above, 

 and of a pale greenish tint. Labrum frilled at the margin. Canal 

 oblique, recurved, rather shorter than the aperture. Length 30 

 millims., diam. 12 ; aperture and canal 16 long and 6 wide. 



Another specimen is 26 millims. long, 1 1 broad ; and its aperture 

 with the canal has a length of 16 millims., and a width of 6. 



Operculum brownish yellow, somewhat ovate, not acute at the 

 nuclear end. 



Hab. Station 6. 



This is a very beautiful species on account of the charming nature 

 of the sculpture, in which respect it resembles T. crispus of Couthouy, 

 which, however, is easily distinguished by the very different form 

 of the whorls. The figure in Gay's work represents the costae 

 narrower and more sharply defined than in the specimens which I 

 identify with this species. 



EuTHRiA ATRATA, sp. u. (Plate IV. fig. 5.) 



Shell ovately fusiform, purplish black. Whorls 7-8 ; nuclear 

 ones rather large, smooth ; the rest convex, with a slight depression 

 at the upper part, longitudinally strongly ribbed and finely spirally 

 striated. Costse narrow beneath the suture, and vanishing on the 

 last whorl a little below the middle. Aperture less than half the 

 shell in length, ovate, continued beneath into a short, narrowish, 

 oblique deep canal, of the same colour as the exterior. Labrum 

 arcuate, thickened by the last rib, with a small tubercle at the com- 

 mencement of the canal. Columella covered with a thin enamel, 

 which is whitish inferiorly, arched in the middle. Length 16 mil- 

 lims., diam. 7 ; aperture 7 long, 3 wide. 



Hab. Station 5 and Puerto Bueno, 2-7 fathoms, bottom rocky ; 

 also Boija Bay, 20 fathoms, on a stony and shelly bottom. 



The principal characteristic of this species is the intensity of the 

 purplish-black colouring. Four of the specimens have furnished 

 resting places for a small Hermit-crab. 



EuTHRiA MERiDiONALis, sp. n. (Plate IV. fig. 6.) 



Shell fusiformly ovate, small, brown, pale at the apex. Whorls 

 6 ; apical one smooth, whitish, convex ; the rest only slightly 

 convex, longitudinally costate, and transversely sulcate. Suture 

 scarcely oblique, rather deep. Costse a little slanting, somewhat 

 arcuate, about 14 on the last whorl, which do not attaiu quite to the 



