REPORT ON THE NUDIBRAN CHIATA. 
41 
the whole intestine is about 2 cm. The interior of the first division of the intestine is 
traversed by numerous fine longitudinal folds, one of which is much stronger than the 
rest, and passes through the small cylindrical portion which joins the anterior and 
posterior divisions of the intestine, it can be recognised from the outside. In the rectum 
the folds are not so strongly developed. The contents of the whole digestive tract form 
a brownish-black mass of unrecognisable animal debris ; in the stomach there were 
fragments of Hydroid polyps, Copepoda, and torn prickles of the stomach itself. 
The two anterior livers (fig. 9, c,c) are small, the right hand one is formed of two 
lobes, and is a little larger than the left hand one (length 5 mm.); both open into the 
first stomach, into which also opens the chief mass of the liver (fig. 9, d) by its short wide 
bile duct (fig. 9, e). The liver measures 3 cm. in length, and has a diameter of 5 mm. 
anteriorly, 2'5 mm. posteriorly, and about 7 mm. in the middle ; it was a trifle flattened, 
its colour like that of the anterior livers, brownish-blackish-grey ; it is divided into a 
number of disk-like lobes, by fewer or more superficial transverse furrows. It has no 
traces whatever of any prolongations into the papillae, nor are there any traces on the 
body-wall of cavities at the base of the papillae for the reception of such diverticula. 
The walls of the liver are thin and delicate, and show a quantity of transverse anasto- 
mosing trabeculae ; the cavity extends throughout the liver. The contents of the liver 
were precisely similar in character and appearance to the contents of the rest of the 
alimentary canal. 
The heart is like that of other species of Bornella, 1 the ventricle quite spherical, 
and about 2 mm. in size. The course of the posterior aorta has been already 
described by me. 2 Transverse sections of the dorsal papillae showed an opening on either 
side for the arteria and vena papillaris (branchialis). 
The renal syrinx was attached to the outer side of the rectum ; it was pear-shaped, and 
had a length of 2 '5 mm. Its colour was yellowish -white and the longitudinal folds were 
quite visible from the outside. The urinary chamber has been already described by 
Hancock and myself ; 3 its breadth is *4— '5 mm. ; it gives out numerous branches from both 
sides, and shows the usual knobs. The strongly branched renal tubes (fig. 12) surround 
the intestines, and contrast by their whitish colour with the liver and hermaphrodite 
gland. 
The rather pale ochre-yellow hermaphrodite gland is 14 mm. long by 7 mm. broad, 
and 3 mm. high, and covers the upper and (further back) the left side of the anterior 
half of the liver, and is somewhat sunk within its surface, but is marked out from it by 
the contrast of colour ; it consists of nine not quite equal lobes, all of which, with the 
exception of the foremost, are paired. The lobes are roundish (fig. 13), and strongly 
facetted; the free surface is finely granulated, the granulation being not so distinct upon the 
facets. The structure (PI. XVII. fig. 17) of the lobules is as usual ; the white club-shaped 
1 Bergh., loc. cit., p. 298, pi. xxxvii. fig. 8. 2 Idem. 3 Bergh, lee. cit., p. 299. 
(ZOOL. CHALL. EXP. PART XXVI.— 1884.) Cc G 
