REPORT ON THE NUDIBRANCHIATA. 
59 
hand gill tuft is the fine renal pore } The dorsal surface itself was beset here and there 
with small points, which were also present upon the sides of the body, and especially 
upon the tail, on which they formed here and there villous processes. The tail has a 
dorsal keel. The genital papilla is large and lies beneath the right dorsal appendage ; 
it has 2 two openings (prseputium, vulva), surrounded by a common margin, and beneath 
the slit-like orifice of the duct of the mucous gland. The foot is of the same breadth 
throughout its whole extent, and only narrows behind at the tail, which gradually comes 
to a point ; it stands out about 1 ‘4 mm. from either side of the body ; its anterior margin 
is straight, with projecting angles and a deepish furrow; the upper lip is split in the 
middle line. 
The intestines were indistinctly visible on the back and sides of the body from the 
outside. The cavity of the body extended as far back as the region behind the last 
dorsal appendage. The peritoneum was colourless. 
The central nervous system (PL IV. figs. 7, 8) is not much flattened ; it is enclosed as 
usual in a (not very tight) capsule. The cerebro-pleural ganglia (figs. 7, ab, 8, ab) lie 
obliquely, their length exceeds their breadth, and the anterior is broader than the posterior 
portion; they are somewhat kidney-shaped, and the two parts of which they are made up 
are distinct from each other ; the cerebral portion has a rounded contour, and is somewhat 
larger than the pleural. The pedal ganglia are oval (figs. 7, c, 8, c), and about as large as 
the cerebro-pleural. The nerve cells range up to '25 mm. in diameter. At the base of 
the eye is a small sessile optic ganglion (fig. 7). The cerebral ganglia give off a nervus 
tentacularis, two nervi labiofrontales, and several nervi retractorum bulbi. The pleural 
ganglia give off a nervus visceralis, two nervi palliales, and the right a nervus genitalis 
in addition. The pedal ganglia give off two nervi pediaei breves and a single 
nervus pediaeus longusd The common commissure (figs. 7, d, 8, d) is wide and strong ; in 
the sheath it is composed of three separate commissures. The proximal olfactory ganglion 
(fig. 7, ee) is sessile and bulb-shaped, and about as large as the buccal ; the distal ganglia 
are about the same size, oval in contour, and lie at the base of the rhinoplioria ; the 
nervus olfactorius is directed upwards, and pursues a winding course. The buccal 
ganglia (fig. 7,f) are round and planoconvex, and united with each other directly; they 
lie upon the strong band-like anterior part of the musculus transversus bulbi posterior 
superior ; from each ganglion a strong nervus lingualis posterior takes its origin, from 
the outside of the nervus lingualis superior, which bifurcates immediately from the upper 
surface the nervus oesophagealis. A gastro-cesophageal ganglion I was unable to find. 4 
At the base of the penis there was a round flattish ganglion of about ‘25 mm. greatest 
diameter. I observed here and there portions of a sympathetic system, with minute 
ganglia. 
1 Bergh, loc. cit., Taf. xii. fig. 9. 
3 Loc. cit., p. 628. 
2 Loc. cit., Taf. xiii. fig. 2. 
4 Loc. cit., p. 629. 
