328
KOHMAN Y. ARAKAWA
Locality : Tomioka, Kumamoto, Japan.
Measurements : For an animal with shell 14.5 mm long, average width of
the ribbons is 0.13 mm.
37. Brachiodontes citrinus Roding
“ 1 animal. An individual 31 mm long produced a ribbon-shaped
pellet 0.5 mm wide and 0.15 mm thick. The ribbon was broken into
pieces under 1 mm in length. It consists of two lateral longitudinal
flanges, a median ridge on one surface. This corresponds quite closely
to the description of the pellets of Mytilus edulis as given by Moore
(1931), although these appear to be intermediate between those of M .
edulis and Modiolus phaseolinus. The main difference is the longitudinal
groove on both surfaces of the ribbon of Brachiodontes citrinus. However,
this extra longitudinal groove was not observed on all of the pieces of
the ribbon.” (Manning and Kumpf, 1959, p. 301, Figs. le, 4c.) (Pellettype 111-lOa).
38. Hormomya exustes (L.)
The largest specimen, 11 mm in length, shed a Wshaped ribbon broken into pieces up to 0.96 mm in length and 0.25 mm
in width. The pellet closely resembles that shed by Volsella citrinus.
They differ in that the ends taper to a thin edge and are less recurved,
and there is no groove in the centre of the upper side.” (Manning and
Kumpf, 1959, p. 301, Figs. lc, 4e.) (Pellet-type 111-lOa).
39. Xeptifer bilocularis (L.) (Pl. 1-8)
Faecal ribbons of this species are ungrooved and crescentic in transverse section with both the edges thickened and upcurled (Pellet-type
111-lOa (210)).
Locality : Tomioka, Kumamoto, Japan.
Measurements: Width of the ribbons voided by an animal with shells
12.0 mm long fluctuates between 0-12 and 0-15 mm.
40. X. bilocularis pilosus (Rve) (Pl. 4-38)
“ The present species gives off ribbon-shaped pellets with a bicrescentic section. The dorso-median ridge is small but rather conspicuous. On the contrary, there is a shallow but wide mid-ventral
groove on the opposite side. They are greyish-brown in colour, coarse
in texture and usually made of somewhat coarse materials. For an
animal with shells 2.4 ern long, the width of ribbons is 0-36 mm.”
(Arakawa, 1965, p. 15, P1. IV, Figs. 40, 46.) (Pellet-type 111-lOa).
“ 3 animals.
KOHMAN Y. ARAKAWA
Locality : Tomioka, Kumamoto, Japan.
Measurements : For an animal with shell 14.5 mm long, average width of
the ribbons is 0.13 mm.
37. Brachiodontes citrinus Roding
“ 1 animal. An individual 31 mm long produced a ribbon-shaped
pellet 0.5 mm wide and 0.15 mm thick. The ribbon was broken into
pieces under 1 mm in length. It consists of two lateral longitudinal
flanges, a median ridge on one surface. This corresponds quite closely
to the description of the pellets of Mytilus edulis as given by Moore
(1931), although these appear to be intermediate between those of M .
edulis and Modiolus phaseolinus. The main difference is the longitudinal
groove on both surfaces of the ribbon of Brachiodontes citrinus. However,
this extra longitudinal groove was not observed on all of the pieces of
the ribbon.” (Manning and Kumpf, 1959, p. 301, Figs. le, 4c.) (Pellettype 111-lOa).
38. Hormomya exustes (L.)
The largest specimen, 11 mm in length, shed a Wshaped ribbon broken into pieces up to 0.96 mm in length and 0.25 mm
in width. The pellet closely resembles that shed by Volsella citrinus.
They differ in that the ends taper to a thin edge and are less recurved,
and there is no groove in the centre of the upper side.” (Manning and
Kumpf, 1959, p. 301, Figs. lc, 4e.) (Pellet-type 111-lOa).
39. Xeptifer bilocularis (L.) (Pl. 1-8)
Faecal ribbons of this species are ungrooved and crescentic in transverse section with both the edges thickened and upcurled (Pellet-type
111-lOa (210)).
Locality : Tomioka, Kumamoto, Japan.
Measurements: Width of the ribbons voided by an animal with shells
12.0 mm long fluctuates between 0-12 and 0-15 mm.
40. X. bilocularis pilosus (Rve) (Pl. 4-38)
“ The present species gives off ribbon-shaped pellets with a bicrescentic section. The dorso-median ridge is small but rather conspicuous. On the contrary, there is a shallow but wide mid-ventral
groove on the opposite side. They are greyish-brown in colour, coarse
in texture and usually made of somewhat coarse materials. For an
animal with shells 2.4 ern long, the width of ribbons is 0-36 mm.”
(Arakawa, 1965, p. 15, P1. IV, Figs. 40, 46.) (Pellet-type 111-lOa).
“ 3 animals.