M
Ma
’\A
,
Pl. 75.
—
,
'
.
.
'
'
,
0 199.
"
'Dîagnam of Oyster, showing i‘nannev of feeding.
Whelk opening oystev shell by inserting edge
'
of shell removed
A., ingoîng currentof
of
1ts
own
shell
between
valves
of
oystev
'
'
water;
B., outgoing current;
C.M;, closing
shell (after Colton).
(p. 206).
.
.
Gç., gill laments; 'M., mouth ; Ma… meuble; S., shell;
_
.
'
Arrows show direction of currents.
(p. 198).
-