262 
Larval Flakes f rom China 
C. circumstricta develops in a redia with small pharynx and a long orange- 
coloured gut. The larva has many points in common with the echinostome 
cercariae, but since it lacks the incomplete collar of spines in the neck region 
and has a complete ring in the anterior oral aspect, there is hesitancy in placing 
it in the group. It may represent a transition to some group of leptocercous 
larvae. 
Cercaria photifera nov. spec. 
(Plate XXII, Fig. 17.) 
This larva, for which the name Cercaria jphotifera is suggested, is a lepto¬ 
cercous form with pear-shaped body and a tail with fluted margins. It was found 
as a 2 per cent, infection in Viviparus polyzonatus Frfid. at Wuchang in June, 
1921. The body is completely covered with delicate spines. The anterior end 
is snout-like. On the dorsal face close to the pharynx are a pair of pigmented 
eye-spots (le) with the pigment cup posterior. The body measures 0*186 mm. 
in length by 0*114 mm. in width, while the tail is nearly a third longer. The 
oral sucker measures 30 /x and is directed anteriad. The ventral sucker which 
is 22 /a in diameter lies mesad. The pharynx is uniquely large, measuring 30/x 
in cross-section. The bladder consists of a poorly defined mid-region and large 
muscular cornua. Details of other parts of the excretory system have not been 
observed. 
Practically the entire body is filled with about 36 cephalic glands (beg) 
with fine granular contents and basophilic reaction. These empty through a 
corona of ducts (cgd) surrounding the sucker. They are tipped with sharp 
hollow spines. It is evident that these glands which occupy so large a mass of 
the larva, play an important part in the migration to or within the next host. 
They obscure the whole central region of the worm, making it impossible to 
make out the underlying or intermediate organs and tissues. The difficulty 
is further accentuated by the presence of a brown pigmentation over the 
surface (omitted in the figure). 
C. photifera develops in an irregularly branched sporocyst without any 
particular differentiating characters. 
Cercaria chromophila nov. spec. 
(Plate XXII, Fig. 18.) 
The larva, for which the name Cercaria chromophila is proposed, was found 
in a 0*6 per cent, infection of Melania ebenina Brot. collected at Iviukiang in 
August, 1921. The fluke has a long body with cylindrical contour and a heavy 
tail which is provided with dorsal and ventral integumentary folds giving a 
graceful sluggish movement to this organ. The body throughout is aspinose. 
On the dorsal side there is a pair of pigmented eye-spots somewhat posterior 
to the pharynx. The entire body is covered more or less with a mottling of 
brown pigment which is especially marked in the region around the eye-spots. 
At the distal end of the worm just lateral to the portion of the tail included 
