418
KOHMAN Y . ARAUAWA
TABLE VI. FREQUENCY DISTRIBUTION OF VARIOUS TYPES OF FAECAL PELLETS PRODUCED BY THE
BIVALVE ORDERS AS CLASSIFIED BY PURCHON (1963)
Pellet -types
I
IA
I1
I I A
I11
1 l a
Classi$cation
. . . . . . . . . . . . . . . . . . . . .
1
la
2
3
4
5
6
7
7a
7b
8
8a
9
9a 10
10a 11
Purchon (1963)
PROTOBRANCHIA
Order
(NO.) -
(%) -
(NO.) -
(%I
-
(%I
-
(Yo)
3.1
SEPTIBRANCHIA
GASTROTRITEIA
(NO.) -
GASTROTETARTIKA
(No.)
1
GASTROPEMPTA
(No.) 21
(yo) 28.0 8.0
3.1 -
21.9 - - - - -
12.5 12.5 21.9 3.1 15.6 3.1 -
3.1