646 Proceedings of Royal Society of Edinburgh. [sess. 
lidium Leuckarti , Roboz * found on the vessels of Solenophorus 
a feeble stratum of circular and longitudinal fibres. The vessels 
which bind the ventral vessels are without muscles. I only saw 
the two powerful longitudinal nerves which are situated on the 
outside of the water- vascular system. 
As the segments are separated by a deep incision, the opening 
of the genital cloaca is situated on the left and anterior side of 
the proglottis. The genital cloaca itself is wrinkled, and lined 
by the continuation of the cuticula of the body. On the walls of 
the cloaca are fixed numerous muscles descending from the 
transverse musculature. These muscles have the function of 
fiattening out the cloaca; they are therefore expanders of the 
genital cloaca. At the bottom of the cloaca a long canal leads 
to the cirrus-pouch, which may be called the ‘ male cloacal canal.’ 
This canal has the same structure as the ‘ hermaphrodite canal ’ 
described by me in Taenia depressa.j This ductus has therefore 
a powerful circular and longitudinal musculature, surrounded by 
numerous nuclei pertaining to myoblasts, and parenchyma cells. 
Through this canal the cirrus passes to the outside. The cirrus- 
pouch, being spherical, has the typical shape of the Prosthecocotyle 
genus. The wall of this organ is 0*018 mm. thick. The internal 
part consists of circular, the external of longitudinal muscles. 
Inside this organ is the short vas deferens, which is enveloped 
by a feeble musculature. The penis is unarmed. The vas deferens 
passes nearly in a straight line under the nerve and between the 
two vessels of the water- vascular system. A series of circumvolu- 
tions, becoming always closer, and passing on the dorsal side of 
the median field to the middle of the segments, commences here. 
The testicles are placed on the dorsal side and are in number ca . 
50. Their diameter is in the dorso-ventral direction ca. 0*17 mm. ? 
the transverse diameter being 0*08 mm. 
The female glands are, except the uterus, situated on the ventral 
side. The ovary is well developed and deeply lobed. The egg- 
cells are very large (0*057 mm.). A protoplasmic mass containing 
* Roboz, F. von, “Beitrage zur Kenntnis der Cestoden, ” Zeitsdirift /. 
wiss. Zoologie, Bd. 37, 1882, pp. 263-285. 
f Fuhrmann, O., “Beitrag zur Kenntnis der Vogeltaenien,” Revue Suiss6 
de Zoologie , t. iii., 1895, pp. 454-458. 
