SCATOLOQICAL STUDIES OF THE BIVALVIA (MOLLTSCA)
341
Locality : Hiroshima Bay, Japan.
Measurement>s : Faecal pellets discharged by an animal with a shell
27.0 mm high are 1.09 mm in breadth.
75. Mantellurn amakusaense Habe (Pl. 2-14)
Faecal rods of this species are characterized by their fragility and
elaborate transverse markings. They appear to be composed of coiled
constituent filaments (Pellet-type '111-8a).
Locality : Tomioka, Kumamoto, Japan.
Measurements: For a specimen with 4.0 mm high shells, pellets fluctuate in breadth between 0.31 and 0.64 mm.
Anomiidae
This group produces ribbon-shaped pellets which may belong to
Pellet-type 111- 1 0a.
76. Anomia Zischkei Dautzenberg and Bavay (PI. 2-15 ; P1. 5-56 ; Fig.
19, p. 402)
Faecal ribbons of this species are usually shed broken into much
shorter pieces. They are coarse in texture, frail in consistency and
yellowish-brown in colour. There is a tendency for the coarse material
to concentrate in the centre with the finer particles towards the periphery. Occasionally, this species releases roughly ovoid or cubiform
faecal bodies which are hollowed longitudinally by two wide shallow
depressions and have a narrow longitudinal slit along both sides. The
faecal bodies are substantially composed of ribbon-shaped constituents
which are regularly folded in triplicate or in quadruplicate. The constituent ribbons are slightly thickened along both edges and raised in
tthe mid-dorsal line to form a longitudinal ridge, but there was no
evidence of the presence of a mid-ventral groove (Pellet-type 111-10).
Locality : Ninoshima, Hiroshima, Japan.
Measurements : The width of the ribbons fluctuates between 0.76 and
0.91 mm.
Unionidae
77. Hyriopsis schlegeli (v. Martens)
Locality : Sinki Lake (migrated from Kasumi-ga-Ura), Shimane, Japan
(Pellet -type ZIII- 10).
A . l . H . - 8
1"
341
Locality : Hiroshima Bay, Japan.
Measurement>s : Faecal pellets discharged by an animal with a shell
27.0 mm high are 1.09 mm in breadth.
75. Mantellurn amakusaense Habe (Pl. 2-14)
Faecal rods of this species are characterized by their fragility and
elaborate transverse markings. They appear to be composed of coiled
constituent filaments (Pellet-type '111-8a).
Locality : Tomioka, Kumamoto, Japan.
Measurements: For a specimen with 4.0 mm high shells, pellets fluctuate in breadth between 0.31 and 0.64 mm.
Anomiidae
This group produces ribbon-shaped pellets which may belong to
Pellet-type 111- 1 0a.
76. Anomia Zischkei Dautzenberg and Bavay (PI. 2-15 ; P1. 5-56 ; Fig.
19, p. 402)
Faecal ribbons of this species are usually shed broken into much
shorter pieces. They are coarse in texture, frail in consistency and
yellowish-brown in colour. There is a tendency for the coarse material
to concentrate in the centre with the finer particles towards the periphery. Occasionally, this species releases roughly ovoid or cubiform
faecal bodies which are hollowed longitudinally by two wide shallow
depressions and have a narrow longitudinal slit along both sides. The
faecal bodies are substantially composed of ribbon-shaped constituents
which are regularly folded in triplicate or in quadruplicate. The constituent ribbons are slightly thickened along both edges and raised in
tthe mid-dorsal line to form a longitudinal ridge, but there was no
evidence of the presence of a mid-ventral groove (Pellet-type 111-10).
Locality : Ninoshima, Hiroshima, Japan.
Measurements : The width of the ribbons fluctuates between 0.76 and
0.91 mm.
Unionidae
77. Hyriopsis schlegeli (v. Martens)
Locality : Sinki Lake (migrated from Kasumi-ga-Ura), Shimane, Japan
(Pellet -type ZIII- 10).
A . l . H . - 8
1"