366
KOHMAN -Y. ARAKAWA
-
of only one continuous sheet, wrapped around the central cavity. The
innermost layer is wider and less firmly consolidated than the others.
The layers bend toward the concave side of the central cavity, and the
spiral line on the outside seems to correspond to this also. At higher
magnification, the particles of the outer shell of the pellet all seem to be
inorganic, angular granules, rarely as large as 3p. No Brownian movement could be seen in a squash preparation in sea water, possibly because the mucous matrix was too viscous. The granules of the central
cavity are irregular spheres, from 10 to 14 p in diameter. These are
hyaline, golden brown and bright in reflected light. Also present were a
few glassy angular flakes, colorless and polygonal, with sharp edges and
angles. These are about 0.30 mm in maximum dimension. I was unable
to find any organismal remains in the pellets, such as diatoms, even a t
970x magnification.” (Harry, 1969, pp. 5-6, Fig. 4.) (Pellet-type 1-2).
Solenidae
Pellets of the representatives of this group belong either to Pellettype IA-3 or 11-4 or to 1-2, which may be interchangeable.
152. Xolen roseomaculatus Pilsbry (PI. 3-35)
Faecal rods are segmented at regular intervals, the length of each
segment being approximately 1.4 times the breadth. The segmentation,
a t times, is replaced by separate ovoid pellets with truncate ends. The
colour and the consistency of pellets appear to vary in relation to the
dietetic condition and growth-stage of the animal, viz., pellets are
greyish-yellow and coarse in mature specimens, while in immature ones
they are fine and yellowish-brown (Pellet-type IA-3).
Locality : Chijiwa Bay, Kumamoto, Japan.
Measurements when size of producer is unknown :
Length of pellet (mm)
0.20 0.21
Breadth of pellet (mm)
0.14 0.14
Ratio lengthlbreadth
1.43 1-50
Measurements when size of producer is 30.0 mm in shell length :
Length of pellet (mm)
0-35
Breadth of pellet (mm)
0.24
Ratio lengthlbreadth
1-46
Measurements when size of producer is 10.0 mm in shell length :
Length of pellet (mm)
0.16 0.15 0.15 0.18 0.15 0.13 0.13
Breadth of pellet (mm)
0.11 0.11 0.11 0.13 0.11 0.11 0.09
Ratio length/breadth
1.45 1-36 1.36 1-38 1.36 1.18 1-45
KOHMAN -Y. ARAKAWA
-
of only one continuous sheet, wrapped around the central cavity. The
innermost layer is wider and less firmly consolidated than the others.
The layers bend toward the concave side of the central cavity, and the
spiral line on the outside seems to correspond to this also. At higher
magnification, the particles of the outer shell of the pellet all seem to be
inorganic, angular granules, rarely as large as 3p. No Brownian movement could be seen in a squash preparation in sea water, possibly because the mucous matrix was too viscous. The granules of the central
cavity are irregular spheres, from 10 to 14 p in diameter. These are
hyaline, golden brown and bright in reflected light. Also present were a
few glassy angular flakes, colorless and polygonal, with sharp edges and
angles. These are about 0.30 mm in maximum dimension. I was unable
to find any organismal remains in the pellets, such as diatoms, even a t
970x magnification.” (Harry, 1969, pp. 5-6, Fig. 4.) (Pellet-type 1-2).
Solenidae
Pellets of the representatives of this group belong either to Pellettype IA-3 or 11-4 or to 1-2, which may be interchangeable.
152. Xolen roseomaculatus Pilsbry (PI. 3-35)
Faecal rods are segmented at regular intervals, the length of each
segment being approximately 1.4 times the breadth. The segmentation,
a t times, is replaced by separate ovoid pellets with truncate ends. The
colour and the consistency of pellets appear to vary in relation to the
dietetic condition and growth-stage of the animal, viz., pellets are
greyish-yellow and coarse in mature specimens, while in immature ones
they are fine and yellowish-brown (Pellet-type IA-3).
Locality : Chijiwa Bay, Kumamoto, Japan.
Measurements when size of producer is unknown :
Length of pellet (mm)
0.20 0.21
Breadth of pellet (mm)
0.14 0.14
Ratio lengthlbreadth
1.43 1-50
Measurements when size of producer is 30.0 mm in shell length :
Length of pellet (mm)
0-35
Breadth of pellet (mm)
0.24
Ratio lengthlbreadth
1-46
Measurements when size of producer is 10.0 mm in shell length :
Length of pellet (mm)
0.16 0.15 0.15 0.18 0.15 0.13 0.13
Breadth of pellet (mm)
0.11 0.11 0.11 0.13 0.11 0.11 0.09
Ratio length/breadth
1.45 1-36 1.36 1-38 1.36 1.18 1-45