218
MARINE MOLLUSCS AS HOSTS FOR SYMBIOSES
9. Cercaria (Gymnophallus) cambrensis Cole, 1938." (Fig. 125)
superfamily Fellodistomatoidea; family Fellodistomatidae)
(Superorder Anepitheliocystida; order Strigeatoidea; suborder Azygiara;
This cercaria was originally described by Cole (1938) from Cardizm
edule brought t o the Conway Mussel Cleansing Station, collected on
the Menai Straits, and collected by W. J. Rees from the Dovey estuary,
FIGS. 125-128.
Larval gymnophallids. (12.5) Cercaria (Gymnophallus) cambrensis
showing arrangement of flame-cells on one side (redrawn after Cole, 1938) ; (126)
sporocyst of Cercaria (G.) fulhrighti with snout-like projection and enclosing
daughter sporocyst and developing cercariae ; (127) young fork-tailed cercaria of
Cercaria ( G . ) fulbrighti; (128) fully developecl tailless cercaria of Cercaria (G.) fulbrighti. (Redrawn after Hutton, 1952.) A S , Anterior (oral) sucker; CG, cephalic
gland; DS, daughter sporocyst,; DT, developing testis; E V , arm of excretory
vesicle ; V S , ventral sucker.
Cardigan Bay, Wales. Within the host, the sporocysts appear as brown
masses located immediately beneath the hinge within the small wedgeshaped cavity found a t that site.
Descriptim of stages in mollusc. Sporocyst more or less oval, thickwalled, colorless or slightly straw-colored, non-motile, containing
* See note 011 p. 390.