129 
smallest specimens considerably larger than in the Dis.'owa 
maticum of the same size. The ventral sucker is always found near 
the end of the anterior half of the body; the distance between tin- 
centres of the two organs varying in the larger specimens from p t. 
57 mm. and being in the two small specimens 3*9 and 3-3 nun, that 
is to say it amounts to at least a third and is usually but little less tli m 
half of the total length. The genital opening has its position about 
halfway between the two suckers and is sometimes found slightl\ 
raised above the level of its surrounding. In one of the specimen'. tin 
penis is seen everted, apparently to its full length, for the larger part 
of the seminal vesicle is located in it ; it represents an organ ;• j m , 
in length and at its base 0*37, at the free end 0-24 mm widt It 
surface is smooth. 
The internal anatomy agrees with the descriptions given In thr¬ 
eadier writers. The small pharynx of C47 mm. length and 1 mi 
width is usually so much displaced dorsally that it is not visible fn 
the ventral aspect; behind it there follows a short oesophagus v,1 1 1 
as a rule, runs straight down towards the ventral side and may tlm- 
more or less entirely disappear from view. The intestinal cae< a of 
proportionally insignificant calibre quickly diverge and follow , , v g 
course which becomes especially pronounced behind the testicles 
Their blind terminations lie about as far as the length of the tongue 
like end-portion of the body in front of the base of that portion and 
usually not quite on the same level, the left branch being ns a rule 
(but not always) the shorter. The full extent of the excretory v- ' • 
could not be made out in any of the specimens at my disposal. -uving 
to the thickness of the body and the strong development of the uterine 
coils. The main parts described in the generic diagnosis are usualh 
seen and followed without much difficulty; but, in addition to them, 
one may observe in some places isolated portions of similar tu’< 
\\ no seem to be ramifications of the anterior and post eric-r lat--r.il 
ranc es. There are two running forwards on either side of the 
ntra sucker, and two running backwards and towards the m-dun 
me amidst the uterine coils in the posterior half of the h dv 
t lough they appear as if they were parts of the excretory w I- 
cannot tell with certainty whether or not they really belong to b ‘ 
organ. The terminations of the main anterior branches of th«- v- 
ie c ose to the oral sucker at about the level of its centre, those of the 
r 
1 
