209 
Dentalium zelandicum, Sowerby. 
Dentalium zelandicum, Sowerby, Thes. Conch., 1860, vol. jii., 
p. 101, sp. 31, pl. cexxiii., fig. 18. Type locatity—New Zealand ; 
Reeve, Conch. Icon., 1872, vol. xviii., pl. ii., fig. 8;. Lesson, 
Conch. Cab. (Hid. Kiister), 1896, Band. vi., Abt. 5, p. 15, sp. 23, 
pl. iv., fig. 4; Pilsbry and Sharp, Tryon, Man. Conch., 1897-8, 
vol. xvii., p. 70, pl. vi., fig. 81; Murdoch and Suter, Trans. New 
Zealand Institute, 1905, vol. xxxviii., p. 304, 110 fathoms off 
Great Barrier Island. It is from one of these specimens kindly 
given me by Mr. Suter that mine are identified. 
Dredged in 130 fathoms off Cape Jaffa, 5 good and 12 
fragments; in 110 fathoms off Beachport, 1 dead; and in 
200 fathoms, 1 fragment large but eroded. 
The radula, pl. xxvii., fig. 7, has the formula 1.1.1.1., 
with a wide low central cusp, a lateral provided with several 
small denticles at its inner lower part, and an oblong rhom- 
boidal marginal. 
My largest specimen attains a length of 55 mm., with a 
width of 6 mm., and has 32 axial ribs, the smaller of which 
arise by intercalation. A specimen of 20 mm. in length, 
with about 2 mm. of the apical end unsculptured, has a dis- 
tinct fissure of 4°75 mm. long on the convex surface; another 
of the same size and age shows none; a third younger still 
has 4 mm. unsculptured and no fissure. The fissure in this 
section of Dentalinm appears to be only occasionally and not 
always present; just as does the appendical tube in another 
section. 
Dentalium virgula, Hedley. 
Dentalium virgula, Hedley, Memoirs Austr. Mus., vol.. iv., 
1903, p. 828, fig. 62. Type locality—‘“Numerous examples were 
taken in 63-75 fathoms off Port Kembla, in 41-50 fathoms off Cape 
Three Points, in 54-59 fathoms off Wata Mooli, and in 50-52 
fathoms off Botany Bay.’’ 
Dredged in 60 and 62 fathoms off Cape Borda, 43 moder- 
ately good; in 90 fathoms off Cape Jaffa, 23 alive and many 
dead and pieces; in 104 fathoms south-west of the Neptune 
Islands, 7 good, 44 moderate; in 110 fathoms off Beachport, . 
4 alive, 21 dead; in 130 fathoms off Cape Jaffa, 3 moderate ; 
in 150 fathoms off Beachport, 93 moderate; in 200 fathoms 
off Beachport, 4 poor. 
Some examples have slight annular constrictions at 
intervals of 3 mm. Here the shell is less opaque-white, and 
the opacity gradually increases anteriorly, as though at the 
constriction the shell were thinner, representing a more rapid 
growth after a period of lessened activity or of rest. The 
appendix is visible in very early life, when the shell is 
extremely narrow. There seems to be a great tendency to 
transverse fracture when the shell is nearly filled up by in- 
