310
MARINE MOLLUSCS AS HOSTS FOR SYMBIOSES
numerous smaller ones on ventral side ; first antenna of six segments,
about 0.3 mm long, basal half enlarged, basal segment with slender,
slightly curved spines, measuring 0.051 mm long, a t anteromedial
corner and four setae a t distal anteroventral part, second segment
incompletely segmented from third, approximately triangular in
ventral aspect, with about twelve simple setae, third segment with
nine setae one of which is on dorsal surface, fourth segment with four
setae, fifth with three setae, sixth with one subterminal and six terminal
FIGS. 207-209. Pseudomyicola spp. (207) Adult female P. ostreae, dorsal view (redrawn
after Yamrtguti, 1936); (208) abdomen of adult female P. glabra, dorsal view;
(209) abdomen of adult male P . glabra, dorsal view (redrawn after Pearse, 1947).
setae, with one much longer than others; second antenna of three
segments with basal segment stout, middle segment about 0.225 mm
long, arcuate, with one basal and three terminal setae, and covered
with numerous minute spines ; terminal claw comparatively short with
a false joint near middle; mandible terminating in two pectinate
blades ; first maxilla with four setae of which the outermost is long and
the two inner are difficult to see; basal segment of second maxilla
armed with numerous spines along posteroventral margin of its larger
proximal portion, terminal blade fringed with eight spines on inner