76 
THE VOYAGE OE H.M.S. CHALLENGES. 
wall, to which is fixed the aorta. The chamber commences at the hinder end of the liver, 
and extends a little in front of its anterior boundary ; it is covered on either side by the 
masses of renal tissue (fig. 3, dd ), which do not exceed l'5-2 mm. in breadth, except 
in the anterior and posterior extremities, and are of a yellowish colour within, changing to 
white upon the outside ; they are traversed from within outwards by prolongations of the 
clefts lying on the side walls of the urinary chamber ; the cavities appear more or less 
distinctly through its walls, and are round or somewhat angular in form. Behind is the 
simple opening of the duct of the renal syrinx (fig. 3), just beside the ascent of the vena 
hepatica magna to the branchia, and of the intestine to the anal papilla, and the con- 
tinuation of the urinary chamber ascends as a urethra to the renal groove. The renal 
syrinx (fig. 3) is bulb-shaped, of ‘75 mm. greatest diameter; the folds of the interior 
can easily be seen from the outside ; the ciliated cells are as usual. The duct of the 
renal syrinx is about 1 '5 mm. long, opening into the chamber ; in the interior are the 
usual villi and papillary outgrowths. 
The sexual products in the hermaphrodite gland were hardly developed. Thus the 
anterior genital mass was not large, 4’5 mm. long, l - 5 mm. broad, and 3'5 mm. high; 
the main efferent ducts, moreover, projected 1 mm. The whole genital mass is yellowish 
in colour. The ampulla of the hermaphrodite duct lies in many coils, when unrolled 
it is about 1 cm. long by ‘4 mm. diameter. The long vas deferens is considerably 
thinner than the ampulla, and covers it for the most part with numerous windings ; 
its length, when unrolled, is about 1 '4 cm. ; below it is much thinner and passes into 
the penis, which is thicker, and reaches a length of 2 mm. The last-mentioned organ 
(praeputium) is provided with a small papilla at the bottom of its cavity. The spherical 
spermatheca (fig. 4, a) is about 1*5 mm. in diameter ; the vaginal duct (fig. 4, b) is about 
a half longer than the receptaculum seminis, below it is somewhat enlarged, and 
forms the vagina; the uterine duct (fig. 4, c ) is much thinner; close by its origin is the 
short-stalked sausage-shaped spermatocyst (fig. 4, d), which has a length about equal to 
that of the spermatheca. Both receptacula seminis were filled with detritus. The mucous 
gland is heart-shaped, somewhat compressed ; on its outside, at the posterior end, a part 
of the yolk-yellow albuminiparous gland was laid bare. The duct of the mucous gland 
is provided with the usual fold. 
Chromodoris runcinata, Bergh (PI. VI. figs. 1-4). 
Chromodoris runcinata, Bergh, Malacolog. Untersuch., loc. cit., Heft xi., 1877, pp. 479-481, Taf. 
li. figs. 32-33, Taf. liii. figs. 5-12. 
Habitat . — Pacific Ocean (Port Jackson). 
A single specimen was dredged in company with Rizzolia australis at Port Jackson, 
od the 17th of April 1874, from a depth of 2 to 10 fathoms. 
