218 
figured, and shows an initial elliptical section “$5 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 sheil. ; 
As this example so beautifully reveals the beginning of 
a Dentalium TI have iad it figured. 
Type in Dr. Verco’s collection. 
Dentalium lubricatum, Sowerby. 
Dredged off Hopetoun in 35 fathoms, 5 good, dead. 
Cadulus occiduus, n. sp. Pl. 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, antec. 
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. 
