Qt 
O2 
(34) 
of type H. liguloides Gerv. (1., p. 308) and are evident from the 
adjoined drawings (Fig. 7—9). Here may only be eited, that the 
ring of the transversal external musele fibers in the posterior part 
of the proglottis (Fig. 7.. m. t. ex.) is so thin, that it can be easily 
overlooked. — and, that the muscle retractor penis (Fig. 8, m. r. 
p.) is fastened immediately under the layer of diagonal muscle fibers 
in the middle part of the ventral side of the proglottis. Longer 
diameter of oval embryo —0:0265 mm, its books — 0:0088 mm. long. 
Hymenolepis parvula M. Kowalewski 1904. 
This very small tapeworm (Fig. 10—11) lives in the duodenum 
of the common duck (Anas boschas L. domestica) and it was also found 
by the author in Dublany (Galieia; March 1903). Maximal length 
of body —1'7 mm, its maximal breadth —0'25 mm. Number of 
proglottides 35 —40. The last 3—5 of them. including ripe onco- 
sphaeres, generally fall off. Head —0:16—02 mm. long, by 0:13— 
—0'15 mm. broad. Suckers slightly oval; their longer diameter 
0:08 mm. long. Rostellum thick, 0:25—03 mm. long. Number of 
hooks (Fig. 12) -—10. their length —- 0:038—0:039 mm. Neck absent. 
In the internal anatomy is also this species similar to the type 
mentioned above. The more important details are the following 
ones: 
The 8 inner longitudinal bundles of muele fibers (Fig. 13, m. 
l. in.) are here excessively strong by developed. The very long eirrus- 
s of the transversal diameter of the pro- 
2 
pouch oceupies above 4/ 
glottis. Its external end is divided into two small branches. Through 
one of them, viz the ventral, passes the cirrus. through the 
second, the dorsal branch. — an interesting organ, very similar 
to the eirrus. This organ, called by the author organ „A“, can also 
be protracted, like the eirrus, however not for so long a distance, 
as the last one (Fig. 13—17, p., A.). Ou aceount of its position on 
the dorsal side of the eirrus and also its probable funetion, the 
author considers it as homologous to the „saceullus accessorius“ 
in many other species of the same genus, for instance in H. sinu- 
' osa Zed. As the organ in question does not possess its own museu- 
lature, which we always find in the ,sacculus accessorius“, it is 
drawn into the eirrus-pouch for being taken there under the action 
of the museles of the latter. It does also not possess spines, and for 
to elose better the eloacal opening, around this opening exists 
