218 



figured, and shows an initial elliptical section '35 mm. in 

 length by '22 mm. in greatest width, and having a round 

 hole in its end of about 15 mm. in diameter with a simple 

 border; a second curved cylindrical section of "36 mm. long 

 by '20 wide; a third slightly conical section of '60 mm. long 

 by '35 mm. wide in its greatest diameter ; and a fourth 

 section of '65 mm. long by '40 mm. wide. The second sec- 

 tion has its walls slightly corrugated, so as to give them a 

 faintly undulating outline, with broad shaded transverse 

 bands, which are visible also in the anterior half of the first 

 section. The third segment is smooth but for very fine 

 accremental transverse scratches. The fourth shows the com- 

 mencement of the axial ribs, which gradually enlarge with 

 the growth of the shell. 



As this example so beautifully reveals the beginning of 

 a Dentalinm, I have had it figured. 



Type in Dr. Verco's collection. 



Dentalium lubricatum, Sowerby. 

 Dredged off Hopetoun in 35 fathoms, 5 good, dead. 



Cadulus occiduus, n, sp. PI. xxvi., fig. 7. 



Shell rather solid ; ventral curve nearly uniformly 

 slightly convex, more at the posterior part; dorsal side 

 nearly straight in the anterior fourth, slightly convex in the 

 next quarter, and slightly concave in the hinder half. It 

 is cut off perpendicularly to the axis behind, rather obliquely 

 in front, where the slope is backward toward the convex side. 

 There is a slight dorso- ventral compression of the tube, so 

 that both the apertures are slightly flattened, especially on 

 the convex side. Surface smooth but for scanty transverse 

 microscopic scratches. Colour white, more opaque anteriorly, 

 and in transverse lines. 



Dimensions. — Length, 9'6 mm. ; anterior diameter, 1 

 mm. ; posterior, '5 mm. ; greatest diameter, 1*4 mm. 



Locality. — Geographe Bay, off Bunbury, in 15 fathoms, 

 type with 7 others; off Fremantle in 10 to 12 fathoms, very 

 many. 



Among the many specimens taken considerable variety 

 obtains. Some full grown may measure only 5 mm. in length 

 and be proportionally narrow, and the inflation on the con- 

 cave side may be less in all degrees, almost to disappearance. 



Cadulus angustior, Verco, antea. 

 Dredged in 35 fathoms off Hopetoun, 3 good ; in King 

 George Sound in 12-14 fathoms, 40 good ; in Geographe 

 Bay in 15 fathoms, 30 good. 



