SCATOLOUICAL STUDIES OF THE BIVALVIA (n1OLLUSCA)
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146. M . crossei (Dkr) (PI. 3-34)
The pellets of this and the following species are somewhat alike.
Here they are elliptical with flattened ends. They are fine and homogeneous in texture and are compacted by fine detrital matter. The surface of the ellipsoids may, at times, be impressed by a single dextrally
coiled stria. The lengthlbreadth ratio fluctuates between 3 and 4 and
pellets voided by a fully matured animal average 0-28 mm in breadth
(Pellet-type 1-2).
Locality : Shikanoshima, Fukuoka, Japan.
Measurements : For an examined animal the pellets averaged 0.28 mm
in breadth.
147. M . pulchella Philippi
Faecal ovoids in this species are well consolidated, fine and uniform
in superficial consistency. They are formed almost entirely from fine
detritus and may have a small boss at one end. The lengthlbreadth
ratio is 1.79 (Pellet-type 1-1).
Locality : Tomioka, Kumamoto, Japan.
Measurements when size of producer is 9.8 mm in shell length :
Length of pellet (mm) 0-32 0.41 0-44 0.37
Breadth of pellet (mm) 0.23 0.19 0.23 0.22
Ratio length/breadth
1.39 2.16 1.92 1-68
148. Tressus keenae Kuroda and Habe (Pl. 5-58)
Faecal rods are constricted at rather regular intervals. The surface
is finely striated by a single spiral cord. The texture is extremely fine
and homogeneous. The lengthlbreadth ratio of separated ovoids
averages 0-82 (Pellet-type IA-3).
Locality : Unknown (Japan).
Measurements when size of animal is 97.0 mm in shell length :
Length of pellet (mm)
1-45 1.75
Breadth of pellet (mm)
1.85 1.85
Ratio length/breadth
0.78 0.95
Measurements when size of animal is 93.0 mm in shell length :
Length of pellet (mm)
1.05 1.25 1-25
Breadth of pellet (mm)
1.55 1.55 1.55
Ratio lengthlbreadth
0.68 0.81 0.81