334
KOHMAN Y ARAKAWA
Measurements : Width of ribbon shed by an animal was 0.58 mm
Remarks : The material examined may be atypical.
57. 8. candidus Lam. (Fig. 5E)
Pellets are discharged in the form of a rod with an oval section.
They are occasionally chapped by transverse clefts. They are soft in
consistency, fine in texture and fulvous yellow in colour (Pellet-type
11-4).
Locality : Yoron-jima, Amami-ohshima Archipelago, Kagoshima,
Japan.
Measurements: From an animal with shell 63 mm high, width of the
pellets fluctuates between 0-55 and 0.75 mm.
Remarks : Cross-sections of rectum show an oval outline.
1v. GASTROTETARTIKA
Pellets described here for representatives of fourteen families cover
a wide range of types compared with those already described. The
pellets range from type 1-1 to 111-10 or Ila exclusive of types IA-3,
11-5, 11-6, 11-7 and its subtypes. I n general, this group displays comprehensive morphological characters of faecal pellets, which include,
besides three common rudimentary types (I-2,II-4 and 111-lo), several
modified forms (11-8, 8a, 11-9, 9a and 1la) which are peculiar to this
group. As pointed out by Purchon (1958 and 1959) from the standpoint
of his recent survey of the bivalve stomach, this order is also intermediate in general composition of pellet-types between the orders
Gastrotriteia and Gastropempta.
Plicatulidae
58. Plicatula gihbosa (Lam.)
" 1 animal. This individual was 0.7 cm long and produced a ribbonshaped pellet that formed a ' W ' in cross-section. Although the ribbon
was in fragments, the longitudinal groove was easily seen. The ribbon
was 0.3 mm wide." (Manning and Kumpf, 1959, p. 302, Pigs. Id, 4h.)
(Pellet-type 111-IOa).
Amusiidae
The pellets of this family are quite characteristic resembling a small
ball of knitting yarn (Pellet-type 11-8).
KOHMAN Y ARAKAWA
Measurements : Width of ribbon shed by an animal was 0.58 mm
Remarks : The material examined may be atypical.
57. 8. candidus Lam. (Fig. 5E)
Pellets are discharged in the form of a rod with an oval section.
They are occasionally chapped by transverse clefts. They are soft in
consistency, fine in texture and fulvous yellow in colour (Pellet-type
11-4).
Locality : Yoron-jima, Amami-ohshima Archipelago, Kagoshima,
Japan.
Measurements: From an animal with shell 63 mm high, width of the
pellets fluctuates between 0-55 and 0.75 mm.
Remarks : Cross-sections of rectum show an oval outline.
1v. GASTROTETARTIKA
Pellets described here for representatives of fourteen families cover
a wide range of types compared with those already described. The
pellets range from type 1-1 to 111-10 or Ila exclusive of types IA-3,
11-5, 11-6, 11-7 and its subtypes. I n general, this group displays comprehensive morphological characters of faecal pellets, which include,
besides three common rudimentary types (I-2,II-4 and 111-lo), several
modified forms (11-8, 8a, 11-9, 9a and 1la) which are peculiar to this
group. As pointed out by Purchon (1958 and 1959) from the standpoint
of his recent survey of the bivalve stomach, this order is also intermediate in general composition of pellet-types between the orders
Gastrotriteia and Gastropempta.
Plicatulidae
58. Plicatula gihbosa (Lam.)
" 1 animal. This individual was 0.7 cm long and produced a ribbonshaped pellet that formed a ' W ' in cross-section. Although the ribbon
was in fragments, the longitudinal groove was easily seen. The ribbon
was 0.3 mm wide." (Manning and Kumpf, 1959, p. 302, Pigs. Id, 4h.)
(Pellet-type 111-IOa).
Amusiidae
The pellets of this family are quite characteristic resembling a small
ball of knitting yarn (Pellet-type 11-8).