122 MR. F. J. MEGGITT ON A 
0184 mm. dia, In the centre of the proglottis, this is coiled into 
a spherical ball, in the coils of which he the spermatozoa. 
The walls appear structureless, but have occasional nuclei, 
0046 x ‘0011 mm., scattered along them. Benedict states that 
the coils are bound together by parenchymal] strands, but these 
I have not been able to see. From this coiled portion, a short 
duct leads to the cirrus-sac, but before entering it, decreases in 
diameter to ‘008-009 mm. 
The cirrus-sac itself (Pl. I. fig. 9) is oval, slightly constricted 
in the middle, and stretches about 3—-}+ across the proglottis, 
extending some distance beyond the vitellaria. Its small size 
in my specimens is surprising, since both Kraemer and Benedict 
figure it as reaching to the middle line of the proglottis, and its 
comparative size is one of the characters used for specific 
distinctions. Its walls (Pl. I. figs. 9 & 10) consist of outer longi- 
tudinal muscles, ‘0023 mm. thick, and inner circular muscles, 
0023 mm. thick, with an exceedingly delicate cuticle surrounding 
them. The basal end of the cirrus-sac is turned rather obliquely 
towards the dorsal side of the proglottis. Its walls bend back 
to form a small tube which becomes united with the wall of the 
vas deferens. This latter, just within the cirrus-sac, has a slight 
muscular coat which gradually becomes thicker and passes into 
the muscular coat of the cirrus. The vas deferens is coiled once 
before opening into the cirrus. 
The latter is an almost straight cylindrical tube, without the 
enlarged distal portion figured by Benedict. It consists of an 
outer layer of longitudinal muscles ‘003 mm. thick, an inner one 
of circular muscles (0023-004 mm. thick, and a cuticle bearing 
fine bristle-like projections externally. The lumen here is 
0046 mm. dia. The external cuticle of the body tucks in 
at the opening of the cirrus-sac and lines the inner wall of 
the cirrus for some distance. Scattered along the course of the 
cirrus-tube and opening into it are numerous pear-shaped glands, 
0034 x °0009 mm. 
The space between the inner tube and the wall of the cirrus- 
sac is filled with fibrous tissue containing many nuclei, 0023 mm. 
dia., but I have been unable to see the definite fibres figured 
by Benedict. At the posterior end of the sac are muscles 
extending from the cirrus-tube into the parenchyma, and 
probably serving for retraction. 
Female Organs. 
The aperture of the vagina is 008 mm. in diameter and is just 
anterior to that of the cirrus-sac. A circular sphincter muscle 
(Pl. IT. fig. 13) encloses the vagina a little within the aperture ; 
it is hemispherical in section, with a diameter of 008 mm. The 
vagina itself runs back to the middle line of the proglottis, tums 
at right angles to its former course, and finally opens into the 
oviduct at the posterior end of the proglottis (text-fig. 4). Its 
