SCATOLOGICAL STUDIES OF THE BIVALVTA (MOLLUSCA)
319
7. Nucula sp.
“ A second and iiwre complexly sc.ull)t,ured type of rod-shaped
pellet was found abundantly a t St. WS 144, and consisted of a rod up to
0.16 mm in diameter with a series of longitudinal grooves on the surface.
I n transverse section (Fig. lb) this also appeared to be formed almost
entirely from diatom remains and may also therefore be classed as a
probable selective feeder. So few pellets have as yet been described that
it would be unreasonable to attempt to identify an unknown pellet with
any given animal without a considerable knowledge of the fauna of the
locality. But this pellet in all respects resembles those at present
known for the genus Nucula, and it is at least reasonable to advance the
possibility of its belonging t o this genus.” (Moore, 1933, p. 23, Fig. lb.)
(Pellet -type 11-7. )
Nuculanidae
Faecal pellets produced by the members of this family which have so
far been studied are in the form of a rod with a single longitudinal
groove (Pellet-type 6). They are extremely fine in surface-texture.
8. Nuculana minuta (Muller) (wig. 3A)
Moore (1939) has figured the pellet of this species by the name of
Leda minuta and has noted that the pellet is rod-shaped with a single
longitudinal groove (Pellet-type 11-6).
9. Portlandia (Portlandella) japonica (Adams and Reeve)
Pellets are rod-shaped with a narrow shallow longitudinal groove,
very fine and homogeneous in surface-texture and fulvous brown in
colour (Pellet-type 11-6).
Locality : Suruga Bay (80 m in depth) and Sagami Bay (90 m in depth),
Japan.
Measurements: For an animal with shell 12.0 mm long the faecal rods
average 0.26 mm in breadth and for one with shell 19.0 mm long,
0-40 mm.
10. Portlandiella beringii (Dall) (Fig. 5 ~ )
Faecal rods bear a single longitudinal sculpture. They are very fine
in texture and greyish-green in colour. They are cut into by numerous
fine cracks (Pellet-type 11-6).
Locality : Off Kinkazan, Japan.
319
7. Nucula sp.
“ A second and iiwre complexly sc.ull)t,ured type of rod-shaped
pellet was found abundantly a t St. WS 144, and consisted of a rod up to
0.16 mm in diameter with a series of longitudinal grooves on the surface.
I n transverse section (Fig. lb) this also appeared to be formed almost
entirely from diatom remains and may also therefore be classed as a
probable selective feeder. So few pellets have as yet been described that
it would be unreasonable to attempt to identify an unknown pellet with
any given animal without a considerable knowledge of the fauna of the
locality. But this pellet in all respects resembles those at present
known for the genus Nucula, and it is at least reasonable to advance the
possibility of its belonging t o this genus.” (Moore, 1933, p. 23, Fig. lb.)
(Pellet -type 11-7. )
Nuculanidae
Faecal pellets produced by the members of this family which have so
far been studied are in the form of a rod with a single longitudinal
groove (Pellet-type 6). They are extremely fine in surface-texture.
8. Nuculana minuta (Muller) (wig. 3A)
Moore (1939) has figured the pellet of this species by the name of
Leda minuta and has noted that the pellet is rod-shaped with a single
longitudinal groove (Pellet-type 11-6).
9. Portlandia (Portlandella) japonica (Adams and Reeve)
Pellets are rod-shaped with a narrow shallow longitudinal groove,
very fine and homogeneous in surface-texture and fulvous brown in
colour (Pellet-type 11-6).
Locality : Suruga Bay (80 m in depth) and Sagami Bay (90 m in depth),
Japan.
Measurements: For an animal with shell 12.0 mm long the faecal rods
average 0.26 mm in breadth and for one with shell 19.0 mm long,
0-40 mm.
10. Portlandiella beringii (Dall) (Fig. 5 ~ )
Faecal rods bear a single longitudinal sculpture. They are very fine
in texture and greyish-green in colour. They are cut into by numerous
fine cracks (Pellet-type 11-6).
Locality : Off Kinkazan, Japan.