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25 0 jj 
Fig. 6. Lagotia expansa. Ventral view of partially 
contracted animal showing: a, delicate flare of collar; 
b, longitudinal stripes; c, peristomal lobe; d, spiral 
whorl; e, lorica; f, spherical nucleus; g, rounded, 
proximal end of lorica; h, non-spatulate foot. 
Because of the overlying pigment, the nucleus 
(^) though up to 20p in diameter is difficult to 
see. The foot (/) is non-spatulate. The color of 
the lorica and animal is a deep blue-green. 
Lagotia gigantia (Dons, 1913), Dons 1934 
gen. (Hadzi, 1951:81). 
Although this may prove to be a form of L. 
expansa, certain characteristics of the Tatoku- 
shima material taken June 19, 1965 seem to set 
it apart. The sac (Fig. 8 e) although 3 5 Op 
long seems too small for the long, almost per- 
pendicular neck which may be up to 1038p 
long and 138p wide. Although as many as 4 
spiral whorls ( d ) may be present, they are 
usually indistinct. Both the neck and its exten- 
sion (c) possess wide, delicate flaring collars 
(a) up to 188p in diameter, and light and dark 
longitudinal stripes (b) . The peristomal lobes 
(/) vary widely. They are of equal size and may 
possess a single, almost median finger (/), a 
lateral finger (/), or a combination of one large 
and two or three small projections ( k ), or two 
large, finger-like projections (/). 
The nucleus (g) is a spherical mass 15-20p 
in diameter and again, because of intense over- 
lying pigment, is difficult to see. The foot (b) 
is non-spatulate. 
The color, so far as I could ascertain, was 
precisely like that of L. expansa — a very deep 
blue-green. 
Lagotia spirorbis (Dons, 1927:7) (see Hadzi, 
1951:96). 
Folliculina spirorbis Dons, 1912:73, figs. 
A-B, pi. 5; Faure-Fremiet, 1936:1155, fig. 
11 . 
An gusto folliculina spirorbis (Dons) (see 
Silen, 1947:63, figs. 77-82). 
Representatives of this unique species (Fig 
9 A and B) were first taken at Tatokushima, 
September 13, 1965 on the shells of Spirorbis 
sp. Later, they were taken from many different 
habitats : P. martensii, Pinna attenuata, and 
Chlamys nobilis. These folliculinids are placed 
in the genus Lagotia simply because of the 
shape and form of the lorica (/) and the 
spherical nucleus (e). Otherwise, there is con- 
siderable doubt whether the absence of a collar 
( b ) and the presence of but one peristomal lobe 
(a) justifies this determination, especially when 
other Lagotia characters are lacking, i.e., color 
and longitudinal stripes, etc. 
The necks of the specimens from Ago Bay, 
unlike those described and figured by Silen 
(1947:62, figs. 77-81), narrow gradually from 
