210 
ternal deposit, so that numerous fragments are found from 
3 mm. upwards in length, and with the appendix projecting, 
resemble candle-ends. When the appendix is absent in the 
early stages of growth the shell is not unlike juvenile D. 
lubricatum, Sowerby, but does not increase quite so rapidly, 
and has more marked transverse striation. 
Dentalium lubricatum, Sowerby. Pl. xxvi. figs. 4 and 4u. 
Dentalium lubricatum, Sowerby, Thes. Conch., vol. iii., 1860, 
p. 97. sp. 3, pl. cev., fig. 56. Type locality——Australia ; Reeve, 
Conch. Icon., vol. xviii., 1872, pl. vii., fig. 55; Brazier, Proc. 
Linn. Soc., N.S.W., vol. ii., 1878, p. 370; Lesson, Conch. Cab. 
(Ed. Kiister), Band. vi., Abt. 5, 1896, p. 14, sp. 22, pl. iv., 
fig. 3; Filsbry, Tryon, Man. Conch., vol. xvii., 897, p. tho, pl. 
xix.. fig. 22; Hedley, Memoirs Austr. Museum, vol. iv., 1903, p- 
328: Pritchard and Gatliff, Proc. Roy. Soc., Vic., vol. xv. (N.S.), 
1903, part 2, p. 222. 
Sowerby’s definition in full is “‘shell polished, elongate, 
white, subpellucid, slightly curved, scarcely fissured, gradually 
increasing.”” Brazier adds “off Port Jackson Heads, 45 
fathoms, hard sand bottom. This fine shell was obtained 
when H.M.S. ‘Challenger’ dredged one day off Sydney 
Heads.’’ Lesson says the apex is whole and is not incised, 
but gives no authority, whereas Sowerby defines it as “scarcely 
fissured.’ Pilsbry supplies the dimensions of Sowerby’s 
figure, ‘length, 64 mm.; greatest width, 6 mm.,”’ but it is 
not known whether the figure was only life size. 
Hedley records the species: —‘‘Several specimens were 
obtained from 63-75 fathoms off Port Kembla, of which the 
largest is 32 mm. long; and from 41-50 fathoms off Cape 
Three Points; Pritchard and Gatliff extend the locality te 
Cowes, Port Phillip Island, Western Port.” 
Dredged in 40 fathoms off Beachport, 6 good; in 55 
fathoms off Cape Borda, 7 good and 7 poor; in 60 and 62 
fathoms off Cape Borda, 30 good of varying size and 93: 
immature; in 90 fathoms off Cape Jaffa, 6 good and 8 poor: 
in 104 fathoms 35 miles south-west of the Neptune Islands, 
2 good and 18 poor and immature; in 110 fathoms off Beach- 
port, 3 good and mature; and in 150 fathoms, 1 moderate. 
No hving examples were taken. 
With reference to the slit my material shows that in the 
very early stage of growth there is no slit, but a central: 
posterior aperture ; the length of the slit may vary from a mere 
notch to a fissure of 2°5 mm. in length in a shell of 365 mm.. 
or of 8 mm. length in an individual of 265 mm. It is always 
on the convex or ventral aspect. It is sometimes a mere 
crack, the two sides of which seem in apposition. At others 
it is an open slit of nearly 4 mm. in width; or the posterior 
