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193 
one-sixth of the body length. The oral sucker has a transverse diameter 
of 0'19 mm. but it is almost invariably elongated, and especially in 
extended specimens. The long diameter is about 0'23 mm. The 
ventral sucker is almost globular and was never found so markedly 
oval as Odhner represents it. Its dimensions are 0'28 x 0'29 mm. 
The ratio of the transverse diameter is therefore approximately 2:3 
and the diameter of the ventral sucker is about one-ninth of the body 
length. 
The pharynx measures 025 x O'lO mm. The intestinal bifurcation 
is not quite so far back as Odhner represents it, but usually occurs 
about the posterior border of the ventral sucker. In other respects 
my specimens agree with Odhner’s description, though it is worthy of 
note that the position of the lateral cuticular folds is not constant in 
relation to the phar’ynx. In the state of extension the pharynx is 
drawn forwards, the space between the folds is increased and three or 
even four may come to be situated behind the pharynx. 
The specimen from Aberdeen exceeded the limit assigned by Odhner 
for the maximum size of the species, as it measured 4 - 6 mm. in length. 
The sucker ratio is the same but the suckers are relatively smaller, the 
ventral being only one-thirteenth of the body length. The yolk glands 
again extend only half-way between the ovary and the ventral sucker. 
The oesophagus is not straight but is twisted into the form of an S and 
is much dilated. 
Lecithoehirium rufoviride (Rud.). 
In the stomach of Conger conger, amongst a large number of 
specimens of Lecithoehirium rufoviride, two specimens were conspicuous 
by their creamy-white colour, in striking contrast to the blood-red hue of 
the others. It seemed almost certain that they must belong to a distinct 
species, but on close examination no features of difference could be 
detected anyl the specimens must therefore be regarded as albino 
individuals of L. rufoviride. They were rather large specimens, the 
body in one measuring 6'4 mm. and the appendix T6 mm. The oral 
sucker had a diameter of 0 - 7 mm. and the ventral 082 mm. In the 
other specimen the body measured 7'3 mm. in length. 
