I 5° 
uterus, with the exception of a few of the hindmost loops, appears 
almost black. As there is otherwise not the slightest difference 
between the examples of these two extremes neither in the size of 
the body, nor in the size of the suckers, &c. 1 do not quite know how 
to account for these variations. To a certain degree, they are 
evidently due to the number of ova contained in the roils, hut to 
another degree just as evidently to a darker shade of the egg-sheik 
themselves. Since the two extremes described above are not sharply 
separated, but connected with each other hy numerous intermediary 
tints it is perhaps not unjustifiable to assume that the shell-substance 
elaborated by the shell-glands becomes darker with the growing age 
of the parasites, and it may be noted in this connection that the latter 
live in, and feed on, a coloured substance, the bile. 
Clonorchis sinensis is chiefly a parasite of Chinese, but occurs 
rarely also in Japan— i.e. according to what we know at present. For 
it is not at all improbable that the worm will he oftener found as soon as 
attention is paid to its existence ; it appears also not unlikely that it 
may be restricted to certain localities. Up to now it does not seem to 
have been found in animals. 
Clonorchis cndcmicus (BAELZ) 1883. 
This species practically takes the place of the true Cion, sinensis 
in the literature published after 1883 and is at present the one usually 
described m text books, &c. as “ Opisthorchis sinensis." Its measure- 
are given by the authors as 10 to 13 mm. length and 2 to 
3 mm. breadth. The smallest specimen actually at my disposal (it 
comes rom the Annamite case described by BLANCHARD) is sonie- 
C ! ntr f C ‘ ed and measures 6 by 1-8 mm.; my largest and fairly 
i-he ~ en e s P ec * men (°f Japanese origin) measures 13 by 2'6 mm ; 
oraUt!!J Ining lndlvuluals ran S e in size between these extremes. The 
diameter dVera§es 0 43 to 0 45 mm. in transverse diameter ; smallest 
another ^ the smalIest specimen mentioned above and 
,ong Md ■■ 6m - 
0-5 mm. Ventral * f PeClmen 10 8 nun - loI >E and 2-3 mm. broad) 
diameters observed o-J, “ TT* °' 37 ‘° °' 4 ° ' S, " alleS, 
(in another long 8 mm h ' ^ SmalIest 5 P ec ™ en ) and o'34"®j 
°’45 mm. fin tl, Ji ’ b d 17 mm )i largest diameter observed 
argest specimen above mentioned). The ratio of the 
