SCATOLOGICAL STUDIES OF THE BIVALVIA (MOLLITSCA)
353
118. Meretrix lusoria (Roding) (Pl. 4-49)
“ This species gives off the rods that are cylindrical and marked
with a slight longitudinal groove presumably printed by the typhlosole.
Occasionally, the rod contains a single constituent filament spirally
coiled (Fig. 52, middle), or rarely it may be made mostly of a simple
very long constituent filament derived from the liver string folded and
compacted to form a rod (Fig. 52, below). The diameter of pellets
voided by an animal with shell 6.5 cm long fluctuates in the range
1.3 mm-2-0 mm and that of constituent filaments is 0-26 mm.” (Arakawa, 1965, p. 18, P1. V, Fig. 52.) (Pellet-type 11-4 (16)).
119. Dosinia (Phacosoma) japonica (Rve) (Pl. 4-50)
“ The faeces are of a typical cylindrical rod and without external
sculptures. They are rather coarse in texture, firm in consistency, dark
greyish-green in colour, and formed of rather fine detrital matter containing some coarse unidentified organisms. The pellet-diameter fluctuates between 0.51 and 0.53 mm for an animal with shell 4.7 cm
long ” (Pellet-type 11-4).
Remarks : “The anatomical examination of the alimentary tract shows
that the circular cross-section of the tract coincides exactly with the
section of the faecal pellet (Pl. 6, Fig. 7).” (Arakawa, 1965, pp. 18-1 9,
PI. V, Fig. 53, P1. VI, Fig. 7 . )
120. Saxidomus purpuratus (Sowerby) (PI. 5-57)
colour (Pellet-type 11-4).
Locality : Ondo, Hiroshima, Japan.
Measurements: For an animal with a shell 68.0 mm long, pellets fluctuated in breadth between 1.20 and 1.30 mm.
Faecal rods of this species are very fine in texture and dark grey in
Petricolidae
12 1. Claudiconcha juponica (Dkr)
“ The pellets are rod-shaped, circular in section and greyish-brown
in colour. The surface is smooth and fine in texture. They are formed of
unidentified fine materials and some diatom frustules. The pellets
voided from an animal 1-09 em long range from 0.19 to 0.20 mm in
diameter.” (Arakawa, 1963, pp. 206-7, Text-Fig. 7 , B.) (Pellet-type
11-4).
353
118. Meretrix lusoria (Roding) (Pl. 4-49)
“ This species gives off the rods that are cylindrical and marked
with a slight longitudinal groove presumably printed by the typhlosole.
Occasionally, the rod contains a single constituent filament spirally
coiled (Fig. 52, middle), or rarely it may be made mostly of a simple
very long constituent filament derived from the liver string folded and
compacted to form a rod (Fig. 52, below). The diameter of pellets
voided by an animal with shell 6.5 cm long fluctuates in the range
1.3 mm-2-0 mm and that of constituent filaments is 0-26 mm.” (Arakawa, 1965, p. 18, P1. V, Fig. 52.) (Pellet-type 11-4 (16)).
119. Dosinia (Phacosoma) japonica (Rve) (Pl. 4-50)
“ The faeces are of a typical cylindrical rod and without external
sculptures. They are rather coarse in texture, firm in consistency, dark
greyish-green in colour, and formed of rather fine detrital matter containing some coarse unidentified organisms. The pellet-diameter fluctuates between 0.51 and 0.53 mm for an animal with shell 4.7 cm
long ” (Pellet-type 11-4).
Remarks : “The anatomical examination of the alimentary tract shows
that the circular cross-section of the tract coincides exactly with the
section of the faecal pellet (Pl. 6, Fig. 7).” (Arakawa, 1965, pp. 18-1 9,
PI. V, Fig. 53, P1. VI, Fig. 7 . )
120. Saxidomus purpuratus (Sowerby) (PI. 5-57)
colour (Pellet-type 11-4).
Locality : Ondo, Hiroshima, Japan.
Measurements: For an animal with a shell 68.0 mm long, pellets fluctuated in breadth between 1.20 and 1.30 mm.
Faecal rods of this species are very fine in texture and dark grey in
Petricolidae
12 1. Claudiconcha juponica (Dkr)
“ The pellets are rod-shaped, circular in section and greyish-brown
in colour. The surface is smooth and fine in texture. They are formed of
unidentified fine materials and some diatom frustules. The pellets
voided from an animal 1-09 em long range from 0.19 to 0.20 mm in
diameter.” (Arakawa, 1963, pp. 206-7, Text-Fig. 7 , B.) (Pellet-type
11-4).