274 
Cladorchis subtriquetrus Rud. 
at once pierces the shell gland, becoming continuous with the much 
broader ootype. The shell gland is median, posterior to the ovary, and 
contiguous to the acetabulum; it measures 0-184 x 0-21 mm. and 
0-220 mm. dorso-ventrally; it is irregular in shape, deeply indented 
sinistro-ventrally by the ootype and is suddenly attenuated posteriorly 
and anteriorly, the latter process extending well to the right and slightly 
overlapping the ovary. The ootype lies embedded between the shell 
gland dorsally and the acetabulum ventrally, slightly to the left of the 
median line; within it there is a finely granular and reticular blue 
material (sections stained by haematoxylin and eosin) female germ cells, 
vitelline granules and spermatozoa; it measures 0-07 mm. broad, 0-14 mm. 
long and has very thin walls. Lamer’s canal begins at about the 
mid-point of the oviduct as above described, it follows the latter closely 
anteriorly, extending directly to the ovary where it suddenly bends 
dorsally, makes one or two easy spirals and ends dorso-median at the 
level of the origin of the oviduct and 0-448 mm. anterior to the excretory 
pore. It does not cross the excretory vesicle or duct and is not provided 
with a receptaculum seminis. 
The uterus passes from the left side of the ootype, in contact with 
the dorsum of the. acetabulum and slightly left of the median line; 
it coils intricately in this region, passing anteriorly and dorsally to the 
ovary, showing its closest turns in this region; it now passes anteriorly 
with a few easy turns in the dorsum of the worm, dipping ventrally 
once between the testicular branches and the caeca on either side. 
Just above the level of the cirrus pouch it turns sharply ventrally and 
arches over the anterior testis; here it runs closely parallel to the vas 
deferens, lying to the left of the same; it passes now slightly posteriorly 
and ventrally to the right side of the cirrus pouch, uniting with the 
ejaculatory duct to form the hermaphroditic canal. This is very fine 
and lies in a broad, low genital papilla situated in a single genital atrium. 
The genital pore shows no trace of a sphincter, much less a sucker. 
At numerous positions, and in practically all parts of its course, the 
uterus dilates into aneurysm-like structures three to eight times the 
diameter of the rest of the tube. Here the cuboidal epithelium is 
replaced by a flat squamous type and the lumen contains a blue granular 
material, sometimes a few pink (vitelline) grannies or vitelline cells 
and occasionally a primitive germ cell. Nowhere are fully developed 
ova found, from which it follows that the specimen described was im¬ 
mature. This absence of ova, or at most the presence of but a solitary 
undeveloped one, is opposed to the view of Otto who believed that the 
