360
KOIlMAN Y . ARAKAWA
Breadth of pellet (mm)
Ratio length/breadth
0.18 0.13 0.15 0.15 0.14 0.14 0.18 0.16 0.15
1.28 1.31 2.00 1-60 1.64 1.71 1.61 1.44 2.00
Measurements when size of producer ( F . iridella) is 17.0 mm in shell
length :
Length of pellet (mm) 1.30 1.00 1-10 0.90 0-70
Breadth of pellet (mm) 0.80 0.60 0.70 0.70 0.60
Ratio length/breadth
1-70 1.60 1.60 1.30 1.20
135. Fabulina pallidula (Lischke)
ends. Ratio length/breadth is 1.11 (Pellet-type 1-1).
Locality : Akitsu, Hiroshima, Japan.
Measurements when size of producer is 7.0 mm in shell length :
Pellets are normally shed in the form of an ovoid with flattened
Length of pellet (mm)
Breadth of pellet (mm)
Ratio length/breadth
0-20 0.20 0.20 0.22 0.20 0-25 0.24 0.24 0.22 0.25 0.21 0.21
0.20 0.18 0.19 0.19 0.19 0.21 0-21 0.22 0.20 0.20 0.20 0.19
1.00 1.11 1.05 1.16 1.05 1.19 1.14 1.09 1.10 1.26 1.05 1 . 1 1
136. Arcopella isselli (H. Ad.) (PI. 3-27)
Occasionally,
they may have a small boss at one or both ends. The superficial consistency is fine, uniform and compacted. The length/breadth ratio is
2.06 (Pellet-type 1-2).
Locality : Tomioka, Kumamoto, Japan.
Measurements when size of producer is unknown :
Length of pellet (mm)
0-34 0.38 0.38 0.38
Breadth of pellet (mm) 0.18 0-18 0.18 0.18
Ratio length/breadth
1.89 2.11 2.11 2.11
The released pellets are ovoid with flattened ends.
137. Semelangulus miyatensis (Yokoyama) (PI. 3-28)
the difference lying in the length/breadth ratio.
ratio averages 1.20, i.e. smaller than in the other (Pellet-type 1-1).
Locality : Tomioka, Kumamoto, Japan.
The pellet shapes in this and the preceding species are much alike,
I n this species the
KOIlMAN Y . ARAKAWA
Breadth of pellet (mm)
Ratio length/breadth
0.18 0.13 0.15 0.15 0.14 0.14 0.18 0.16 0.15
1.28 1.31 2.00 1-60 1.64 1.71 1.61 1.44 2.00
Measurements when size of producer ( F . iridella) is 17.0 mm in shell
length :
Length of pellet (mm) 1.30 1.00 1-10 0.90 0-70
Breadth of pellet (mm) 0.80 0.60 0.70 0.70 0.60
Ratio length/breadth
1-70 1.60 1.60 1.30 1.20
135. Fabulina pallidula (Lischke)
ends. Ratio length/breadth is 1.11 (Pellet-type 1-1).
Locality : Akitsu, Hiroshima, Japan.
Measurements when size of producer is 7.0 mm in shell length :
Pellets are normally shed in the form of an ovoid with flattened
Length of pellet (mm)
Breadth of pellet (mm)
Ratio length/breadth
0-20 0.20 0.20 0.22 0.20 0-25 0.24 0.24 0.22 0.25 0.21 0.21
0.20 0.18 0.19 0.19 0.19 0.21 0-21 0.22 0.20 0.20 0.20 0.19
1.00 1.11 1.05 1.16 1.05 1.19 1.14 1.09 1.10 1.26 1.05 1 . 1 1
136. Arcopella isselli (H. Ad.) (PI. 3-27)
Occasionally,
they may have a small boss at one or both ends. The superficial consistency is fine, uniform and compacted. The length/breadth ratio is
2.06 (Pellet-type 1-2).
Locality : Tomioka, Kumamoto, Japan.
Measurements when size of producer is unknown :
Length of pellet (mm)
0-34 0.38 0.38 0.38
Breadth of pellet (mm) 0.18 0-18 0.18 0.18
Ratio length/breadth
1.89 2.11 2.11 2.11
The released pellets are ovoid with flattened ends.
137. Semelangulus miyatensis (Yokoyama) (PI. 3-28)
the difference lying in the length/breadth ratio.
ratio averages 1.20, i.e. smaller than in the other (Pellet-type 1-1).
Locality : Tomioka, Kumamoto, Japan.
The pellet shapes in this and the preceding species are much alike,
I n this species the