DENTALIUM-FISSIDENTALIUM. 71 



D. pacificum HUTTON, Catal. Mar. Moll. N. Z., p. 5 (1873) ; Man- 

 ual K Z. Moll, p. [130] (1880). 



It is very likely the same as D. zelandicum Sowb., as Hutton 

 surmises. 



D. HUTTONI Kirk. 



Shell white, lustrous; small, curved, rapidly tapering; ribbed, 

 ribs unequal, about 18 at the anterior end but diminishing in num- 

 ber towards the apex. Length 0*63, breadth at anterior end O'l inch 



=15-75, 2-5 mill. (Kirk}. 



Wellington, New Zealand. 



D. huttoni KIRK, Annals and Mag. Nat. Hist. (5),vi,p. 15 (July* 

 1880) ; Trans. N. Z. Institute, xii, p. 306 (May, 1880). 



Three specimens from the stomach of a trumpeter (Latris heca- 

 teia). 



D. AMPHIALUM Watson. PL 8, fig. 37. 



Shell long, conical, nearly straight, what curve there is very equal 

 throughout, of a dirty brownish-yellow, chalky on the surface, por- 

 cellanous beneath. Both specimens are very much eroded, especially 

 on the convex curve, and show a prodigious number of layers of 

 shell, which is, however, thin and slight. There is a short, irregular 

 anal fissure on the convex curve. Sculpture: There are about 50 

 very slightly raised, rounded, longitudinal ridges, the furrows be- 

 tween which are very much like the ridges reversed, being very 

 shallow and open. These vary a good deal at different parts of the 

 shell, and tend to disappear toward the mouth ; they are crossed by 

 fine, close-set, sharp, but very superficial, irregular scratches, which 

 run elliptically round the shell, advancing on the concave and re- 

 treating on the convex curve. As the shell grows, these lines of 

 growth become harsh and broken. Length 2 inches, nearly ; 

 breadth '3, nearly ; least length 0*05 inch. (Watson). 



Animal small for the shell, of a pale, ruddy color, which is deeper 

 and browner on the foot and liver, the latter very large : two large 

 masses of long, fine, equal captacula fill the mantle cavity ; they 

 spring from the front of the pedestal out of which the buccal mass 

 and the foot arise, and of these, two large bunches project through 

 the mantle orifice ; buccal palps very small (Watson). 



Off mouth of La Plata River, 1900 fms. (Challenger). 



D. amphialum WATSON, Journ. Linn. Soc. Lond., xiv, p. 510; 

 (1879) ; Challenger Rep., p. 3, pi. 1, f. 3. 



