564 FUNAFUTI ATOLL. 
AGADINA STIMPSONI, A. Adams. 
Pelseneer, Joc. cit., p. 31, pl. i., figs. 11 — 14. 
A few specimens dredged off Tutaga Islet in 45 —52 and 200 
fathoms and north of Pava in 36 fathoms. 
PELECYPODA. 
ARCA PTEROESSA, Smith. 
Smith, Chall. Rep., Zool., xiii., 1885, p. 262, pl. xvii., fig. 4. 
Two small .separate valves were dredged at 200 fathoms off 
Tutaga Islet. 
ARCA CONGENITA, Smith. 
Smith, Joc. cit., p. 264, pl. xvii., fig. 6. 
One small valve from 50 - 60 fathoms off Tutaga Islet. 
LIMOPSIS DAVIDIS, sp. nov. 
(Fig. 80.) 
Shell small, suborbicular, flattened, 
scarcely inequilateral. Colour white, 
with a few, small, scattered brown 
dots. Posterior margin truncate ; 
ventral and anterior margins rounded. 
Umbo prominent. Epidermis de- 
nuded. Sculpture—about twenty- 
four, prominent, radiating ridges 
sharply crenulate the margin and 
fade away before reaching the umbo, 
these are separated by flat interstices 
of about twice their breadth. Theyare 
more prominent and closer together 
at the posterio-ventral side, but for a 
space in the posterior slope one or 
two seem missing. The whole valve 
is covered with close concentric 
wrinkles, which become coarser as 
the ventral margin is approached. 
Hinge area very broad and rather 
curved, teeth three on each side. 
Internal margin crenulate. Height 
1:22, length 1:22 mm 
One valve from 45—52 fathoms 
off Tutaga Islet. 
Named in honour of Prof. T. W. E. David, B.A., under whose 
auspices it was secured. 
