Maddox, on Parasites of the Commori Haddock. 93 
well as the two smaller contain a mass of particles apparently 
nucleated. From the two larger 1 have only been able to see 
faint traces of what appeared to be ducts, passing in the 
direction of the smaller masses and towards the neck of the 
pyriform sac. Whether these convoluted bodies be ovaries or 
convoluted oviducts, and the pyriform sac a uterus, or 
whether the former be testes and the latter the female organ, 
as in the arrangement discovered in the other distomas, or 
whether they be reproductive organs at all, I have failed in 
satisfying myself, in consequence of the delicacy of their 
texture and the comparatively dense integument of this part 
of the animal.” Thus it appears he did not notice the double 
row of small globular bodies. We have now the large oblong 
albuminous (?) sac crossing the body and terminating below, 
whilst at the lower third, situated rather to one side, is 
a curious and constant organ much denser in the larger than 
in the smaller animals. It is an elongated body slightly 
curved on itself at its upper part, containing a central canal, 
in which in living specimens can be seen minute particles in 
motion ; the sides of the upper half consist of highly refrac- 
tive parts, apparently set at an angle to the canal, the upper 
end being united by a cord or duct to the two large circular 
bodies ; the lower part of the organ is surrounded by circular 
fibres, a few longitudinal also being visible. At this part is 
a peculiar twisted arrangement, of which I could not deter- 
mine the real nature ; traced further downwards the widened 
contorted portion appears to terminate in a funnel-shaped 
cavity, this having a distinct exit to the side and near 
the outlet of the large dark sac , — vide fig. 4. In some 
positions I noticed a small projecting hody near its centre, 
which I am led to suppose connects this at about its middle, 
with either the tubes of the globular bodies, or of the terminal 
duct of the convoluted nucleated tubes. Is this both a male 
organ and oviduct combined, — the minute particles seminal 
matter, the upper part of it the testis, the medium size cir- 
cular body a seminiferous receptacle, the two large globular 
bodies ovisacs, containing fecundated ova, and the two smaller 
globular bodies as receptacles of the sixteen, more or less, 
yelk masses, preparatory to impregnation ? There are still 
to be described four rapidly vibrating or pulsating points, at 
the lower third of the body, as in the fig. 4, indicated by 
the letters p. o, they are seen as narrow, bright, rapidly 
quivering lines in one position. When examined with a 
power of 445 diameters they appear -A-th of an inch in 
length, and in another aspect as a small circular spot. The 
pulsations were not equal, some being quicker at one than 
