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 pi. xxvi., fig. 4«. 

 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 \\ 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. 138, I discussed it fully. 



Dredged since then in 26 fathoms 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. PI. xxvi., figs. 5, 5a, 56. 



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, 4'6 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 G. acuminatus, Tate, in being 

 narrower and more cylindrical, with less bulging about the 

 middle. 



