4 EDGAR A. SMITH. 



shoulder of the whorls into erect hollow spines. Whorls 5, the two apical, forming the 

 protocouch (fig. 4b), smooth, globose ; the rest slopingly tabulated above, almost straight 

 at the sides, but a little contracted below towards the suture, sculptured between the 

 lamellae with fine spiral striae, which are crossed by very fine lines of growth, producing 

 a textured appearance. The body-whorl is contracted below the middle and terminates 

 in a slender oblique recurved snout. The aperture is elongate-pyriform, with the canal, 

 exceeding half the entire length of the shell. Columella contorted, covered with a 

 smooth, glossy, pellucid callus. 



Length, 13 millim. ; diam., 7 ; aperture and canal, 7 millim. long, 2'50 broad. 



Off Coulman Island, 100 fathoms. 



Only a single specimen of this species was obtained. In general form it is very like 

 the var., gunneri of the northern T. clathratus (see Sars, Moll. Eeg. Arct. Norvegiae, 

 pi. xv., figs. 11, lla). It may be separated on account of its much larger protoconch, 

 and more distinct sculpture between the lamellae. The latter are rather more erect and 

 spine-like at the upper part of the whorls, and the aperture is entirely devoid of colour. 



THESBIA? INNOCENS. 

 (PI. I. figs. 1-lb.) 



Shell small, moderately elongated, turreted, dirty-whitish within and without, 

 rather thin, not glossy, finely, yet distinctly, spirally striated ; whorls 5, considerably 

 convex, the first l| forming the smooth glossy protoconch; suture oblique, deep; last 

 whorl contracted anteriorly, more closely striated upon the cauda than above ; aperture 

 occupying about f of the entire length of the shell ; labrum thin, prominent and curved 

 at the middle, broadly and shallowly sinuated above ; columella slightly arcuate, 

 covered with a thin callosity which is joined to the upper end of the labrum ; 

 anterior canal short, rather broad, oblique, scarcely recurved. 



Length, 7'5 millim. ; diam., 3'5 ; aperture, 3 '25 millim. long, 1'5 broad. 



Operculum (fig. Ib) minute, horny, thin, yellowish, roundly ovate, with a sub- 

 terminal nucleus and exhibiting lines of growth, and also some radiating lines or striae. 



Hole 12. In 25-30 fathoms; also Hut Point, Feb. 13, 1904. 



The genus, or sub-genus, Tkesbia is said to have no operculum, but the present 

 species has a very minute one which might easily be overlooked. It agrees, however, 

 so closely in other characters with the type of the genus ( T. nana Loven *) that I do 

 not feel inclined to separate it from this group only on that account. 



ADMETE DELICATULA. 



(PI. I., figs. 5, 5a.) 



Shell fusiformly ovate, minutely rimate, very thin, dirty white, ornamented with 

 numerous fine thread-like spiral lirse, and excessively delicate close-set lines of growth. 



* Forbes and Hanley, Brit. Moll., vol. iv., pi. cxii., fig. 8; Jeffreys, Brit. Conch., vol. v., pi. Ixxxviii., fig. 4 ; 

 Sars, Moll. Beg. Arct. Norv., pi. xvi., f. 2. 



