SCATOLOGICAL STUDIES OF THE BIVALVIA (MOLLUSCA)
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Locality : Hiroshima Bay, Hiroshima, Japan.
Measurements when size of producer is 9.0 mm in shell length :
Length of pellet (mm)
0.45 0.38 0.39 0.41 0.41 0.40 0.35 0-45 0.38 0.39 0.37 0.43
Breadth of pellet (mm)
0.20 0.21 0-21 0.21 0-21 0.21 0.21 0.21 0.21 0.21 0.21 0.21
Ratio length/breadth
2.25 1.81 1.86 1.95 1.95 1.91 1-67 2.14 1-81 1.86 1.76 2.05
132. Nitidotellina nitidula (Dkr) (Pl. 3-25, P1. 5-61)
The pellets are usually shed in an ovoid form, circular in section.
There are several varieties ; some are discoidal and others are short rods
transversely constricted at one or two points. There is some localization
of the content ; the coarser material tends to concentrate towards the
centre and the finer to the periphery. The ratio of length/breadth
averages 1.21 (Pellet-type 1-1).
Locality : Tomioka, Kurnamoto, Japan.
Measurements when size of producer is 13.0 mm in shell length :
Length of pellet (mm)
Breadth of pellet (mm)
Ratio lengthlbreadth
0.27 0.28 0.30 0.32 0-26 0.30 0.26 0.28 0.28 0.27 0.28 0.26
0.20 0.24 0.23 0.22 0.24 0.24 0.22 0.20 0.26 0.26 0.24 0.24
1.35 1.17 1.30 1.45 1-08 1-25 1.18 1.40 1.08 1.04 1.17 1-08
133. F. minuta (Lischke) (PI. 3-26)
134. F. iridella (v. Martens) (PI. 5-59)
These two species are very much alike in pellet characteristics. The
pellets are normally rounded, but may have a small boss at one or both
ends. The lengthlbreadth ratio averages 1.62 for F. minuta and 1.48
for F. iridella (Pellet-type 1-1).
Localities : Tomioka (P. minuta) and Hiroshima Bay (P. iridella),
Japan.
Measurements when size of producer (P. minuta) is 7.0 mm in shell
length :
Length of pellet (mm)
0.23 0.17 0.30 0-24 0.23 0-24 0.29 0.23 0.30