1916. | F. H. Stewart: Indian Helminthology. 297 
exact lower connection cannot be determined. A uterus is not 
recognisable apart from the cavity of the ovary. The tissues of 
the animal are, however, so loose that it is impossible either to 
prove or to disprove the homology of some of the spaces with the 
uterus of larger forms. On passing from the unfertilised to the 
fertilised segments (fig. 12) the egg-mass broadens out. This may 
be due to a change of situation of the eggs or merely to an increase 
in size. . 
The present writer has not been able to recognise a shell-gland. 
The yolk-gland atrophies at the 65th segment, having decreased 
in size from the 63rd. 
Development of the ova.—The ova in the 50th segment have 
no cell outlines, the nuclei being embedded in a syncytium (fig. 
6). At the 53rd segment irregular cell outlines appear (fig. 7). 
In the 54th segment yolk granules occur in the protoplasm (fig. 
8), which increase markedly in size up to the 60th segment (fig. 
g). Fig. 10 shows the segmented egg of the 62nd segment. The 
embryos develop double-contoured shells in the goth segment and 
embryonic hooks in the gIst. , 
Male reproductive organs in the 60th segment.—The three testes 
lie near the posterior margin of the segment close to the dorsal 
surface (fig. 1). The vas deferens (figs. 2 and 3) leads forward to 
the base of the seminal vesicle. The seminal vesicle (fig. 4), a 
sausage-Shaped thin-walled structure, runs from the midline to- 
ward the left side to become continuous with the cirrus pouch. The 
walls of the latter (fig. 5) are markedly thicker than those of the 
former and contain muscle fibres. A definite cirrus has not been 
recognised by the present writer. 
The seminal vesicle can first be observed to contain sperma- 
tozoa in the 44th segment. The testes are progressively com- 
pressed behind the 63rd segment and disappear about the 67th or 
68th. 
Fig. 11 represents the 57th segment of an undissected prepa- 
tation seen from the ventral surface. It shows the three testes, 
the vas deferens and seminal vesicle, the ovary, yolk-gland and 
receptaculum seminis. 
LITERATURE REFERRED TO IN THE TEXT. 
1. Grassi.—Die Taenia nana und ihre medecinische Bedeutung. 
Centralbl. f. Bakt. und Parasitol., 1887, p. 97. 
2. Grassi and Calandruccio.— Weitere Nachrichten ueber Taenia 
nana. Ibid., 1887, p. 282. 
3. Grassi and RovelliimEmbryologische Forschungen an Cesto- 
den. Ibid., 1889, p. 370. 
Leuckart.—Menschliche Parasiten. 
Linstow.—Ueber Taenia nana, Sieb. und T. murina, Duj. 
Jenaische Zeit. }. Naturwiss., 1896, p. 570. 
6. Miura and Yamasaki.—Ueber Taenia nana. Mitth. a. d. med. 
Fac. d. kats. Jap. Univ. Tokio, 1897, p. 239. 
gk 
