211 
third may be a slit and the anterior two-thirds a crack; and 
this crack may seem to be wider inside the shell, as though 
it were absorbed from within; and sometimes the crack con- 
nects two or three holes where the erosion has come through. 
In two examples there project from the posterior end on each 
side a short lamina about } mm. long, a continuation of the 
internal layer of the shell. The largest individual dredged is 
365 mm. long and 3°25 mm. at its widest part. In some 
examples the dorsal part near the posterior end is spotted 
or blotched with opaque-white. 
I was fortunate enough to dredge two specimens which 
show the extreme posterior end, figured in pl. xxvi., fig. 4a. 
It is an elliptical bulb, and has a very short, slightly- 
contracting, round tubular posterior prolongation set some- 
what obliquely to the axis of the bulb, and directed toward 
the convex side of the shell. ‘Transverse rings of varying 
opacity are visible in the first 1} mm. of the shell. The 
figure represents the earliest 2 mm. of the shell. 
Cadulus acuminatus, Tate. 
Cadulus acuminatus, Tate, Trans. Roy. Soc., S.A., 1887, vol. 
ix., p. 194. In 1904 vol. xxviii. , p. 188, I discussed it fully. 
Dredged since then in 26 esate 30 miles south-east of 
Newland Head, 2 alive; and in 28 fathoms close by, 6 alive ; 
in 62 fathoms north-west of Cape Borda, 2; and in 90 
fathoms off Cape Jaffa, 67 in good condition. 
Cadulus angustior, n.sp. Pl. xxvi., figs. 5, 5a, 5b. 
Shell thin, slightly curved, chiefly in the posterior half, 
cylindrical, very gradually increasing from behind, and very 
slightly narrowed at the front, scarcely compressed laterally. 
Fractured at the posterior end at right angles to the 
curve, and with a small triangular spine, “1 mm. long, pro- 
jecting backwards from the convex side. Anterior end open, 
sloping obliquely forwards from the convex side. Margins 
simple and smooth. Shell smooth, diaphanous. 
Dimensions.—Length, 46 mm.; breadth, ‘6 mm. 
There is a transverse milky line near the front; other 
specimens want this, and some may have one near the pos- 
terior end. 
Locality.—Twenty-six fathoms 18 miles south-east of 
Newland Head, outside Backstairs Passage, type with several 
scores alive ; 62 fathoms north-west Cape Borda, 8 good. 
Diagnosis. —It differs from C. acuminatus, Tate, in being 
narrower and more cylindrical, with less bulging about the 
middle. 
