SCATOLOGICAL STUDIES OF THE BIVALVIA (MOLLUSCA)
409
8o t
I 1
40t
I I
100
EUTAXOOONTIDA
i
401 Ord PTEROCONCHIDA
20
0
loot Ord CALLOCONCHIDA
80
60
40
20
0
1 2 3 4 5 6 7 8 9 1 0 1 1
c
ISOFILIBRANCHIDA
1
0
;
1 Ord. EUDESMODONTIDA
6 0
40
20
0
Ord. ASTHENODONTIDA
60
40
20
20
0
Pellet-types
Fig. 24. Frequency distribution of types of pellets produced hy the bivalve orders in
t,he classification of Cox (1960).