184 CADULUS-GADILA. 



equal to the diameter of the latter. There is no thickening of the 

 shell wall toward the aperture, and no appearance of striae under 

 considerable magnification. 



The greatest diameter of the tube is contained about 5 times in 

 the length of the shell ; that of the aperture is contained about 7 

 times. 



This species is considerably like the North Atlantic C. subfusifor- 

 mis in contour. C. simillimus Wats., is a more swollen species. 



C. COLUBRIDENS Watson. PI. 26, fig. 71. 



Shell like an adder's fang, long, sharp, bent, very slightly flat- 

 tened, swollen near the broader end. The swell, which is faintly 

 angulated and is at one-fourth of the length, is chiefly on the con- 

 vex curve, but is visible on the concave curve too. From the angu- 

 lation the curve is very equable in either direction till about two- 

 thirds along toward the apex, where it bends a little more. The 

 shell is thin, brilliant, semi opaque, white. Sculpture: Very faint 

 and fine scratches on the lines of growth. Mouth large, oval, very 

 slightly flattened on the ventral side, from which the thin, sharp 

 edge is obliquely cut off upwards towards the convex curve. The 

 posterior opening is much smaller, nearly round, and the edge is 

 thin and chipped. Length 0'58 inch, breadth at mouth 0'067, 

 greatest (H, at apex 0'033 inch. (Watson). 



Lat. 37 34' &, long. 179 22' E., N. E. point of New Zealand, 

 in 700 fms. (Challenger). 



C. colubridens WATSON, Journ. Linn. Soc. London, xiv, p. 523 

 (1879) ; Chall. Rep., Scaphopoda, p. 18, pi. iii, f. 1 (1886). 



This is twice the size of C. gadus Montagu, but it resembles that 

 in the angulation, which, however, is here more marked at the sum- 

 mit of the swelling ; its expansion from the smaller end is more 

 gradual, and its contraction from the angulation to the mouth is 

 more rapid. (Wats.}. 



C. VIPERIDENS Melvill & Standen. PI. 33, fig. 55. 



Shell of medium proportions, somewhat curved, very smooth, a 

 little tapering towards the apex as well as at the aperture ; delicate, 

 pellucid, milk white. Aperture rounded, the margin thin ; poste- 

 rior orifice very small, the margin acutely cut into two lobes, thin. 

 Length 6*5, diam. of aperture 1, of apex 0'5 mill. 



Lifu, Loyalty Is. (Mr. & Mrs. Hatfield). 



