COUNTERCURRENTFLOW
BUCCALCAVITY
GILLFILAMENT
OPERCULUM
CAPILLARY
GILLARCH
LAMELLAE
L
R
M
H
O
R
S
M
A
Y
G
I
L
L
A
R
C
H
O
O
O
I
O
F
F
C
N
X
B
I
Y
I
W
R
U
T
N
K
U
W
B
K
U
Q
E
R
Z
W
P
Q
D
E
O
R
U
O
O
K
S
N
B
W
O
K
I
X
D
N
U
S
O
X
L
P
P
B
H
V
S
G
K
T
Z
Y
V
X
K
U
N
A
I
X
F
C
D
U
W
O
H
O
M
T
O
E
M
Y
A
J
E
O
I
Z
T
A
W
C
I
O
I
E
A
T
U
A
U
J
U
O
E
F
Z
L
N
U
K
C
L
Z
K
C
J
A
U
L
U
Q
V
V
M
I
N
E
E
L
Z
A
A
S
O
A
E
C
U
L
I
Y
I
O
U
I
L
L
R
D
U
L
O
N
G
P
H
H
X
E
D
U
S
H
U
O
X
O
R
I
I
C
P
F
A
I
R
E
O
M
W
F
E
M
U
I
I
S
U
I
A
A
M
T
W
L
A
J
E
A
P
I
F
E
I
A
P
C
C
U
A
V
U
H
K
L
I
R
O
L
B
I
M
Q
I
W
S
E
R
H
D
I
L
I
U
A
O
D
W
E
F
M
U
M
X
J
C
C
E
U
R
T
U
B
X
R
F
I
A
A
A
R
R
A
V
O
X
E
T
K
A
Y
C
U
J
Y
U
A
N
E
C
A
E
G
S
K
U
K
N
Q
C
Z
R
O
A
B
K
C
O
Z
C
H
Q
M
D
E
F
V
U
A
Z
U
E
G
Y
K
A
A
K
B
B
S
I
A
B
S
D
I
O
Q
N
N
P
X
O
M
Z
D
U
I
U
S
D
H
C
J
A
Q
C
S
W
I
O
M
S
O
Q
J
T
K
Q
D
A
G
I
L
L
F
I
L
A
M
E
N
T
W
