EEPOET OH THE NUDIBEAHCHIATA. 
83 
breadth, and is situated upon the anterior genital mass. The gut arises from the 
anterior part of the stomach, and immediately bends backwards, lying in a superficial 
furrow at the right margin of the liver; its length is about 2'5 cm., its diameter 2*5 mm . 
in front, about 1 mm. behind ; in the interior were fine longitudinal folds, which could 
be followed as far as the anal papilla. The digestive tract contained, here and there, 
white soft masses of food, which consisted of indistinguishable animal remains and 
numerous broken teeth from the radula of the animal itself ; the cavity of the liver con- 
tained a similar mass. 
The liver is some 14 mm. long by 10 mm. in height and 7 mm. in breadth; the 
posterior end rounded ; the anterior end oblique, inclined downwards and forwards, with 
a deep median furrow for the oesophagus ; its colour was yellowish ; the cavity wide, with 
large crypts. There seemed to be a pear-shaped gall-bladder, about 2 ’5 mm. long. 
The pericardium is large, 8 mm. broad by 5 mm. in length ; the yellowish-coloured 
ventricle of the heart is 1'5 mm. long. The anterior blood gland of roundish angular 
contour, of a greatest diameter of 1’2 mm. ; the posterior one longish oval, 3 '5 mm. long ; 
both were very much flattened and whitish in colour. The Tddney is made up of 
short club-shaped acini, in which were numerous concrementa. The renal syrinx is 
yellowish and bulb-shaped, of about '8 mm. in diameter, of the usual structure. 
The hermaphrodite gland is made up of numerous, mostly roundish, whitish-yellow 
lobules, and covers the liver everywhere as far as the origin of the bile duct ; the 
ovarian follicles are few in number, round and pear-shaped, and surround the testicular 
part ; the gonoblasts well developed. The thin white hermaphrodite duct takes its 
origin at the right side of the cardia. — The anterior genital mass is three-sided, the 
anterior surface being somewhat excavated to receive the bulbus pharyngeus ; its height 
is 8 '5 mm., length 6‘5 mm., breadth 5’5 mm. ; the main efferent ducts project 1 ‘2 mm. 
The opaque yellow ampulla is strongly bent, and placed in a deep cleft on the hinder 
margin of the genital mass ; when extended it measured 1 cm. long by mm. broad. 
The very long prostatic portion of the vas deferens forms a whitish coil upon the upper 
surface of the ampulla ; its diameter is about ‘5 mm. ; it passes into the much thinner 
yellowish muscular part (PL II. fig. 16, a), which too lies rolled into a flattened coil at 
the anterior margin of the genital mass ; when unrolled the length of this last part is 3 '3 
cm. ; its last part passes downwards from the anterior margin of the genital mass into 
a prolongation (penis) bent in the middle and directed first downwards then upwards 
(fig. 16, b), and about 8 mm. in length ; this prolongation was about two or three times as 
thick as the vas deferens, and through it the seminal passage wound its way to the very 
short prseputium (fig. 16, c). The spermatheca (fig. 17, a) is yellowish in colour, and lies 
behind the ampulla, quite enclosed by the mucous gland ; it is spherical in shape, and 
has a diameter of 3*5 mm. ; it was filled with semen and detritus; the vaginal (fig. 17, b) 
and uterine (fig. 17, d) ducts pass near each other out of the spermatheca. On the root 
