206 Records of the Indian Museum. [Vor Soir. 
conclusive. It is, however, of considerable value in consideration 
of the statement of Grassi and Rovelli that they obtained infec- 
tion in every rat employed which was between the ages of one 
and three months. 
On the roth of January two young white rats (Mus decu- 
manus albino) were obtained which were stated to be twenty days 
old and which appeared to be about that age. Their faeces were 
examined and no eggs of parasites found. On the 1oth of Febru- 
ary they were presumably 42 days old. Five specimens of H. 
nana were obtained on that day from an Indian soldier after the 
administration of Ol. Chenopodii. One specimen was stained and 
mounted and proved to contain onchospheres. The remaining four 
were given, two each, to the two young rats and were actually 
swallowed by them. On the toth of March and 5th of April the 
faeces of these animals were examined and found not to contain 
any ova. One rat died on the 12th of April, the second was killed 
on the 17th. No tapeworms were found in their intestines. 
The experiment! therefore tends to prove that Hymenolepis 
nana and H. murina are two distinct species and that the rat is 
not the source of infection of man. 
On THE SECTIONAL ANATOMY OF HYMENOLEPIS NANA, SIEB. 
The anatomy of Hymenolepis nana, Sieb., has been described 
by Leuckart (4, pp. 832, 995), Linstow (5), Miura and Yamasaki 
(6), Railliet (g), and other authors. A full account of the litera- 
ture is given by Ransom (10). None of the authors mentioned 
above have illustrated their papers with figures of sections except 
diagrammatic figures. The present writer therefore considers it 
desirable to publish drawings of the actual sections together with 
some pictures of the undissected animal and a short account of 
the anatomy of the reproductive system. 
The female reproductive organs are fully developed from the 
50th segment; fertilisation takes place between the 62nd and 
66th (fig. 12). It takes place abruptly; thus in the 61st segment 
all the eggs are unsegmented; in the 62nd, if this is the first 
fertilised segment, the left lateral and ventral half of the egg-mass 
is segmented, the right lateral and dorsal half unsegmented; in 
the 63rd segment all the eggs with the exception of one or two 
near the yolk-gland are segmented. Fig. 12 shows this transition 
between the 62nd and 63rd segments, it also shows the commenc- 
ing atrophy of the yolk-gland in the fertilised segments and the 
testes, seminal vesicle and cirrus sac. - 
Figs. 1-5 are drawn from sections of the 60th segment. They 
show the yolk-gland, the bilobed ovary, the receptaculo-ovarian 
duct, the receptaculum seminis’ and vagina. The receptaculo- 
ovarian duct has not been described previously in this species. It 
leads from the receptaculum in the direction of the ovary, but its 

1/1 understand that the experiment was carried out at Hong Kong.—Ed. | 
