436 WILLIAM NICOLL. 
to have any constant direction. In Br. delphini and Br. 
rochebruni they are regularly ovoid. In a specimen of 
5°5 mm. length the sizes of the testes are: Anterior, length 
54 mm., breadth 1:20 mm., thickness ‘55 mm.; posterior, 
length ‘93 mm., breadth 1:02 mm., thickness 52mm. Thus 
the diameter of the posterior testis is two elevenths of the 
body length. 
The ovary is median or very slightly to the right side, 
directly in front of the anterior testis and close to the ventral 
surface of the body. It is separated from the ventral sucker 
by a very short space. Braun is not quite correct in saying 
that the ovary is globular in shape, for I find it constantly 
slightly elongated transversely. The mean of three measure- 
ments gives the length *30 mm., breadth 37 mm., thickness 
28 mm. The ovarian ova are largest towards the anterior- 
dorsal surface, and measure ‘0155 x ‘0087 mm. ‘They are 
fusiform in shape, with large, round nuclei, measuring 
‘0077 mm. Looss has figured and described the correspond- 
ing cells of Br. palliatum, and it is evident that our 
observations agree fairly closely, except that I find the cells 
constantly rather more elongated. It is true, however, as Looss 
remarks, that these cells undergo various changes in shape. 
The shell-gland complex (fig. 6) in this species differs in 
more than one respect from that of Br. palliatum, as 
described by Looss, and particularly in the greatly reduced 
size of the receptaculum seminis and the presence of a distinct 
yolk-reservoir. The oviduct (diameter ‘029 mm.) arises from 
the dorsal surface of the ovary. Not far from its origin it 
describes a complete circle upon itself and then passes on in 
a straight course. About midway between the ovary and the 
dorsal surface of the body it dilates sightly and then turns 
at right angles towards the left. At this point there is 
a small sacculation, on the right side, no wider than the ovi- 
duct itself, and not differentiated from it by any marked 
constriction. This is all that remains of the receptaculum 
seminis, and in all probability it no longer functions as such, 
for it never contains sperms and its lumen is almost entirely 
