REPORT ON THE NUDIBRANCHIATA. 
23 
genus Janus, and lies transversely ; its length is about 7 mm., and its breadth 3 ’5 mm ; on 
either side it receives the long yellowish-brown-coloured bile duct ; near the left bile duct 
open the wider main bile-duct, which runs medially along the under surface of the herma- 
phrodite gland ; the hinder pyloric end of the stomach has a thicker darker brown- coloured 
wall. The intestine resembles that of Janus. 1 The posterior bile duct as well as the intestine, 
when opened, was found to contain a mass of soft yellowish calcareous and animal debris, 
the nature of which could not be recognised. The liver is probably like that of Janus, 
but I am unable to say anything with certainty about the liver-caeca in the papillae. 
The heart and the renal system appear not to differ from those of Janus. 
The hermaphrodite gland is of a beautiful reddish-yellow- ochre colour, and is of a short 
conical shape, with a slanting broad base and a slightly flattened rounded posterior end, 
its length is 11 mm., and its breadth 10 mm. The gland is made up of a small anterior 
right-hand, and a larger posterior left-hand portion ; both these portions are composed of 
a great number of rounded, facetted, and finely granular lobules, measuring 2 “2 5 mm. in 
diameter. The gland is acinous in structure ; in the ovarian follicles are the large oogene 
cells. The hermaphrodite duct lies deep down between the two halves of which the gland 
is composed, and is formed from two main branches ; the colour is whitish ; in front of the 
hermaphrodite gland it forms a delicate coiled ampulla, 2 cm. long and '5 mm. broad, which 
about the middle of the upper side of the anterior genital mass opens into it. This 
latter organ is about 11 mm. long, 7 '5 mm. broad, 7 mm. high; the under surface 
is convex, the margins of the sides quite parallel ; the upper surface, on account of the 
presence of the penis and the coiled knot formed by the vas deferens, decreases in size 
from the middle towards the anterior and posterior margins respectively. The vas deferens 
is yellowish in colour and coiled into a large roll ; when uncoiled, its length is about 6 cm. 
and its diameter through its whole length '3 mm.; it passes into the much thicker penis. 
This last, or to speak accurately the prseputium, is 5 mm. long and 4 mm. in diameter, 
and is entirely occupied by the glans. The glans consists of a cylindrical portion an cl a 
broad horizontal piece forming its anterior third. I was able to trace out the vas deferens 
to its circular opening on one of the corners of the transverse piece of the glans ; its 
diameter is uniform throughout its whole course. There is no armature either on the 
glans or in the vas deferens. The short sac-like seminal bladder has a length of 2 '25 mm., 
it was filled with semen ; its duct is about as long as the organ itself. The albuminiparous 
gland is yellowish, the slime-gland whitish ; the duct has the usual fold. 
Cuthonella, n. gen. 
Corpus elongatum vix depressum. Caput sat latum, tentaculis vix longis, rhinophoriis 
simplicibus. Anus latero-clorsalis. Papillae conicse, vix caducse, seriebus transversalibus, 
coetibus paucis aggregatis positis. Poclarium sat latum, antice angulatum. 
1 The state of preservation, of this part of the body permitted no sufficient investigation into the alimentary tract. 
