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PACIFIC SCIENCE, Vol. XXII, April 1968 
HalofolUculina annulata (Andrews, 1944) 
Hadzi gen., 1951, Slovenica Biology 2: 
152-153, fig. 25. 
Parafolliculina annulata Andrews, 1944, 
Trans. Am. Microscop. Soc. 63:321-325, 
fig- 3. 
HalofolUculina annulata (Fig. 4) was first 
taken at Tatokushima, July 9, 1965 from the 
valves of P. martensii and the calcareous tests 
of the acorn barnacle, Balanus amphitrite 
Brock. The Ago Bay representatives of this 
species follow in almost every respect the speci- 
fic characteristics set forth by Andrews (1944). 
The lorica is dorso-ventrally flattened. The 
length of the sac (/) is up to 200p; its width, 
150p. The height of the sac rarely attains 50p. 
The lorica, exclusive of the neck, is well ce- 
mented to the substratum by a rather extensive 
collectoderm (/). A narrow collar {a) is all 
that marks the rather plain neck ( b ). Unlike 
the one figured by Andrews (1944:323, fig. 3), 
no rings or spiral whorls are present. The 
b~ 1 
180 p 
Fig. 4. HalofolUculina annulata, ventro-lateral 
view of left side showing: a, narrow collar; b, neck; 
c, dorsal valve; d, ventral valve; e, peristomal lobe; 
f, sac; g, spherical nucleus; h, foot; i, collectoderm. 
ventral valve ( [d ) is larger and better developed 
than the dorsal valve (c). 
The peristomal lobes ( e ) lack finger-like pro- 
jections and end rather bluntly. The nucleus (g) 
is non-moniliform and varies from lOp to 13p. 
The foot (h) is non-spatulate. 
The living animal and its lorica vary from 
colorless to a rather deep brown. Old, empty 
loricae are invariably dark. 
Diafolliculina rotunda Hadzi, 1951, Slovenica 
Biology 2:161-165, fig. 27. 
Diafolliculina rotunda (Fig. 5 A and B) was 
first taken at Tatokushima, July 10, 1965 on 
the scales of P. martensii. Not until some weeks 
later, however, was positive identification made. 
It is easily confused with the genus Halofol- 
liculina which, as previously seen, also possesses 
about the same general body shape, a spherical 
nucleus, no vestibule and well-developed valves. 
The anterior end of D. rotunda viewed ven- 
trally (Fig. 5 A) discloses a rather broad collec- 
toderm (a) and a short, almost circular neck 
(U) with valves ( c , d). However, since the 
diameter of the neck may be only 30p, valve de- 
termination (i.e., which is dorsal, which is 
ventral) is difficult. In Figure 5 B (a lateral 
view of the right side) the valves are clearly 
seen. The rather short, thick, ventral valve (/) 
lies above the thin dorsal one (g) which often 
curves posteriorly. In related species (D. simi- 
lis) the dorsal valve is often folded, but this 
condition is not seen in D. rotunda from Ago 
Bay. 
The peristomal lobes are irregular, of average 
length and breadth, and without finger-like 
processes. The nucleus is spherical and measures 
up to 2 7p in length and up to 24p in breadth — 
a very prominent nucleus for such a small 
folliculinid. 
As is true for many of the small folliculinids, 
the lorica and body vary from colorless to very 
light green. 
Lagotia exp ansa (Levinsen, 1893) Hadzi, 1951, 
Slovenica Biology 2:55-73, fig. 6a. 
Lagotia exp ansa (Fig. 6) was first observed 
at Tatokushima, June 19, 1965 on the shell of 
the large Japanese oyster, Pinna attenuata . 
Literally thousands of folliculinids together 
with other species comprise the vast epifauna of 
this oyster. The genus Lagotia here contains 
