133 
measurements agree fairly well with those given by RAILLIET who, 
in the Saigoon specimens, found the oral sucker to vary in diameter 
from 075 to 0'93 mm., the ventral sucker from 07 to 0*9 nun. The 
distance between the centres of the two organs which RAILLIET give 
as i‘3 to 2‘4mm. is in the four above mentioned specimens, 27, 2-97, 
27 and 272 mm. ; the suckers are therefore, in Eurytrcma coelo- 
maticum, proportionately much nearer to each other than 
they are in E. pancreaticum , for the ventral sucker lies in the former 
species with the greater part of its mass still in the anterior third of 
the body and the distance between the two always remains than 
a third of the total length. The size and relative position of the 
suckers represent, apart from the general shape of the body, the mu-u. 
conspicuous of the specific characters of Eurylrema coelomaticum. 
The internal anatomy has been so fully described by RaILLIEI 
and MAROTEL that I have nothing of importance to add ; it is more 
over essentially the same as that of E. pancreaticum , as may be seen 
by a comparison of the data given above with the description of the 
French authors. There are nevertheless the following differences 111 
detail which 1 am inclined to consider as of specific value, although 
some of them are not absolutely constant. In E. coelomaticum, the 
genital glands never present the lobed appearance of those ol 
E. pancreaticum , but always show a compact shape with irregular 
bulgings of their surface instead of lobes; the apparent rule that one 
testicle has four the other five bulgings seems however to be preserved 
here too. The yolk-glands which, in E. pancreaticum, were composed 
of ten to twelve groups of follicles, show in E. coelomaticum , only >i.\ 
to eight; the glands are therefore as a whole shorter than in the 
preceding species and they also begin somewhat farther backward-, 
viz. at the same level with the posterior margin of the testicles In 
spite of that, their posterior terminations appear much more distant 
from the end of the body than in E. pancreaticum, a fact due to tIn¬ 
considerable difference in the relative position of ventral sucker and 
genital glands in the two species. In E. coelomaticum, finally, it . - 
not so uncommon to see one or the other uterine coil pass beyond the 
intestinal branches laterally. 
I he eggs, in shape, aspect and structure of the miracidium, closely 
resemble those of E. pancreaticum , but are somewhat smaller, namely 
