332 
Entozoci of Fishes 
Laurer’s canal is given off directly from the reeeptaculum seminis and 
is of no great length. The shell-gland lies a little to the left of the 
ovary, between it and the yolk-reservoir, which is situated almost in the 
middle of the body. 
The yolk-glands are very voluminous especially in the posterior 
half of the body. Their disposition is mainly lateral but they extend 
well to the inner side of the intestinal diverticula. They completely 
fill the post-testicular space. Further forward they overlap the margins 
of the testes and ovary to a variable extent. At the level of the 
veutral sucker they are as a rule sparse and may even be absent. In 
front of the sucker they increase again hut are much less voluminous 
than in the posterior region. The glands from the two sides rarely if 
ever- cross the middle line to unite in front of the ventral sucker as 
they do m L. alacris. Occasionally however a few stray follicles may 
he observed dorsal to the ventral sucker or cirrus-pouch. The anterior 
limit of the glands is subject to some slight variation. In most cases 
they stop a little behind the posterior border of the pharynx, but in 
a few specimens they reach the pharynx, in others they terminate at the 
level of the intestinal bifurcation. This, however, does not represent 
the full extent to which variation may proceed, for in at least one case 
the glands were entirely absent on the left side in front of the ventral 
sucker, although they were present to the normal extent on the right. 
The follicles are usually of large size with a diameter of 0'055 mm. 
The uterus is very restricted in extent, being closely packed between 
the ventral sucker, the ovary and the anterior testis and containing 
only a small number of ova, never exceeding 20 in my specimens. The 
ova are almost exactly elliptical except that the opercular pole is blunted, 
almost battened in fact. At the anopercular pole the shell is thickened, 
forming a slight knob but not nearly so pronounced as in L. idonea. 
They are of considerably larger size than in the latter species being 
0’085—0'092 mm. in length and 0’038—0051 mm. in breadth. The 
average size is about 0 - 088 x 0015 mm. 
This species must for the present be regarded as peculiar to 
Callionymus lyra. Its occurrence in Pleuronectes platessa can only 
be considered as accidental or at least very rare. 
Species 2. Lebouria alacris (Looss 1901). 
What I must now x’egard as the species actually described by Looss, 
was met with only once at Millport in Labrus berggylta. On the 
