SCATOLOGICAL STUDIES OF THE BIVALVIA (MOLLUSCA)
339
66. C . (Mimachlamys) nobilis (Rve) (Fig. 6, right)
rod with trilobed section.
shorter pieces.
numerous occasional clefts (Pellet-type IIA-9).
Locality : Kashikojima, Mie, Japan.
67. C. (Aequipecten) opercularis (L.)
“ The pellet is in the form of a rod, typically trefoil-shaped in section, and with the dorsal ridge slightly larger than the other two. The
depth of the gooves is variable, so that the pellet may approach the
shape of C. triradiata in section : most frequently the ventral groove is
flattened while the lateral grooves are deeply cut. The colour ranges
from dark brown to light grey. Typically the pellet is considerably
cut up by transverse clefts, although it may be fairly smooth. From
an animal of shell length 2.0 cm the pellets average 0.4 mm in diameter.” (Moore, 1931, p. 284, PI. 30, Fig. 4.) (Pellet-type IIA-9).
68. C. tigerina (Muller)
“ Very similar to the previous species, but the pellets are usually
smoother, and less cut up by transverse clefts. From an animal with a
shell 1.6 cm long, the pellets average 0.4 mm in diameter.” (Moore,
1931, p. 284, P1. 30, Fig. 4.) (Pellet-type IIA-9).
This species may defecate pellets that are in the form of a grooved
They are usually shed broken into much
The surface of the pellets is normally chapped by
69. C. (Mirapecten) squamata (Gmel.) (Pl. 2-13; Fig. 8c, 16, p. 399)
of C. vesiculosus (Dkr) (Pellet-type IIA-9).
Locality : Hiroshima Bay, Japan.
Measurements: Breadth of pellets voided from an animal of shell
length 23 mm was 0.49 mm.
Pellets of this species are very similar in nature and form to those
70. C. triradiata (Muller) (Fig. SA)
“ This also voids its pellets in the form of a long rod, but the surface
is less smooth than in Nucula, and frequently marked by transverse
clefts so that the pellet breaks into short lengths. I n section the pellet
is triangular with rounded corners, one being usually sharper than the
other two, and with slightly concave sides. From a specimen 3.5 cm
across the shell the pellets are about 0.6 mm broad and in lengths of one
to three millimetres or more.’’ (Moore, 1931a, p. 363, Fig. 5-A.) (Pellettype IIA-9a).
339
66. C . (Mimachlamys) nobilis (Rve) (Fig. 6, right)
rod with trilobed section.
shorter pieces.
numerous occasional clefts (Pellet-type IIA-9).
Locality : Kashikojima, Mie, Japan.
67. C. (Aequipecten) opercularis (L.)
“ The pellet is in the form of a rod, typically trefoil-shaped in section, and with the dorsal ridge slightly larger than the other two. The
depth of the gooves is variable, so that the pellet may approach the
shape of C. triradiata in section : most frequently the ventral groove is
flattened while the lateral grooves are deeply cut. The colour ranges
from dark brown to light grey. Typically the pellet is considerably
cut up by transverse clefts, although it may be fairly smooth. From
an animal of shell length 2.0 cm the pellets average 0.4 mm in diameter.” (Moore, 1931, p. 284, PI. 30, Fig. 4.) (Pellet-type IIA-9).
68. C. tigerina (Muller)
“ Very similar to the previous species, but the pellets are usually
smoother, and less cut up by transverse clefts. From an animal with a
shell 1.6 cm long, the pellets average 0.4 mm in diameter.” (Moore,
1931, p. 284, P1. 30, Fig. 4.) (Pellet-type IIA-9).
This species may defecate pellets that are in the form of a grooved
They are usually shed broken into much
The surface of the pellets is normally chapped by
69. C. (Mirapecten) squamata (Gmel.) (Pl. 2-13; Fig. 8c, 16, p. 399)
of C. vesiculosus (Dkr) (Pellet-type IIA-9).
Locality : Hiroshima Bay, Japan.
Measurements: Breadth of pellets voided from an animal of shell
length 23 mm was 0.49 mm.
Pellets of this species are very similar in nature and form to those
70. C. triradiata (Muller) (Fig. SA)
“ This also voids its pellets in the form of a long rod, but the surface
is less smooth than in Nucula, and frequently marked by transverse
clefts so that the pellet breaks into short lengths. I n section the pellet
is triangular with rounded corners, one being usually sharper than the
other two, and with slightly concave sides. From a specimen 3.5 cm
across the shell the pellets are about 0.6 mm broad and in lengths of one
to three millimetres or more.’’ (Moore, 1931a, p. 363, Fig. 5-A.) (Pellettype IIA-9a).