SCATOLOGICAL STlTDIES O F THE BIVALVIA (MOLLUSCA)
349
well consolidated. The ratio of length to breadth of the ovoid pieces
averages 1.65 (Pellet-type IA-3).
Locality : Tomioka, Kumamoto, Japan.
Measurements when size of producer is 10-5 mm in shell length :
Length of pellet (mm)
Breadth of pellet (mni)
Ratio of lengthlbreadth
0.51 0.53 0.75 0.89 0.64 0.46 0.46 0.46 0.53 1.00 0.44
0.34 0.34 0.34 0.34 0.34 0.34 0.34 0.34 0.34 0.34 0.34
1.50 1.56 2.21 2.62 1.89 1.35 1.35 1.35 1.56 2.94 1-30
Measurements when size of producer is 7 . 5 mm in shell length :
Length of pellet (mm)
Breadth of pellet (mm)
Ratio of length/breadth
0.36 0.44 0.29 0.29 0.31 0-35 0.31 0.35 0-39 0.38 0.35
0.24 0.26 0.22 0.20 0.20 0.22 0.22 0.22 0.22 0.27 0-20
1.50 1-69 1.32 1.45 1.55 1.59 1.41 1.59 1.77 1.41 1.75
102. Trigoniocardia medium L.
" 1 animal. This specimen, 20 mm long, released pellets with two
distinct shapes. The first of these pellets was ovoid in shape, and had a
maximum length of 0.55 mm and a width of 0-37 mm. The second
type of pellet was much more elongate. It was 1.0 mm long and 0.22 to
0.38 mm wide. Both of the pellets were smooth in consistency, and the
smaller ones were slightly smoother than the larger." (Manning and
Kumpf, 1959, p. 303.) (Pellet-type 1-1.)
Ueneridae
I n most of the representatives of this family, pellet-type 11-4 is of
common occurrence.
103. Circe scripta (L.)
Pellets are oval and uniform in shape with fine surface texture. The
ends of pellets are dissimilar; one is normally rounded, the other
bluntly pointed. Pellet-colour varies from pale greyish-yellow to
greyish-white (Pellet-type 1-1, 1-2).
Locality : Mukaishima, near Onomichi, Hiroshima, Japan.
Measurements when size of producer is 37.0 mm in shell length :
349
well consolidated. The ratio of length to breadth of the ovoid pieces
averages 1.65 (Pellet-type IA-3).
Locality : Tomioka, Kumamoto, Japan.
Measurements when size of producer is 10-5 mm in shell length :
Length of pellet (mm)
Breadth of pellet (mni)
Ratio of lengthlbreadth
0.51 0.53 0.75 0.89 0.64 0.46 0.46 0.46 0.53 1.00 0.44
0.34 0.34 0.34 0.34 0.34 0.34 0.34 0.34 0.34 0.34 0.34
1.50 1.56 2.21 2.62 1.89 1.35 1.35 1.35 1.56 2.94 1-30
Measurements when size of producer is 7 . 5 mm in shell length :
Length of pellet (mm)
Breadth of pellet (mm)
Ratio of length/breadth
0.36 0.44 0.29 0.29 0.31 0-35 0.31 0.35 0-39 0.38 0.35
0.24 0.26 0.22 0.20 0.20 0.22 0.22 0.22 0.22 0.27 0-20
1.50 1-69 1.32 1.45 1.55 1.59 1.41 1.59 1.77 1.41 1.75
102. Trigoniocardia medium L.
" 1 animal. This specimen, 20 mm long, released pellets with two
distinct shapes. The first of these pellets was ovoid in shape, and had a
maximum length of 0.55 mm and a width of 0-37 mm. The second
type of pellet was much more elongate. It was 1.0 mm long and 0.22 to
0.38 mm wide. Both of the pellets were smooth in consistency, and the
smaller ones were slightly smoother than the larger." (Manning and
Kumpf, 1959, p. 303.) (Pellet-type 1-1.)
Ueneridae
I n most of the representatives of this family, pellet-type 11-4 is of
common occurrence.
103. Circe scripta (L.)
Pellets are oval and uniform in shape with fine surface texture. The
ends of pellets are dissimilar; one is normally rounded, the other
bluntly pointed. Pellet-colour varies from pale greyish-yellow to
greyish-white (Pellet-type 1-1, 1-2).
Locality : Mukaishima, near Onomichi, Hiroshima, Japan.
Measurements when size of producer is 37.0 mm in shell length :