526 SIR CHARLES ELIOT ON THE NUDIBRANCHIATA 
Tritona appendiculata, sp. n. 
One specimen marked “9 Fathoms. April 1903. Harbour S Orkneys.” (Station 
325. Scotia Bay.) 
The animal has the usual shape of Tritonia: on the left side is a large blister, prob- 
ably accidental. The length is 51°5 mm., the maximum height and breadth 12 and 16 
respectively. The colour is a uniform dirty greenish-yellow. The back is thickly 
covered with small round flat warts. The oral veil is 12°7 mm. wide. It does not 
project much from the head, and bears twelve simple digitate processes, most of which 
are about 2 mm. long, but two are very small tubercles, At the ends of the veil and 
below the outermost process on each side is a large grooved tentacle, of the shape usual 
in the genus. The lips project on each side of the mouth as distinct ridges, prolonged 
at the top into free cylindrical processes 2°5 mm. long, resembling tentacles. 
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Fie, 6.—Branchia. Fic. 7.—Portion of edge of jaw. Fic. 8.—Median tooth. 
Fies. 6 to 8.— Tritonia appendiculata. 
The sheaths of the rhinophores are 3 mm. high and 3°5 mm. broad ; the margins are 
jagged. The rhinophores are thick clubs, surrounded by about ten simply pinnate or 
bipinnate plumes, white, with greenish tips, and hard to separate from one another. 
The dorsal margin is distinct, 3 mm. broad, and starts from the back of the rhinophore 
sheaths, to which it is attached, giving them a somewhat elongated appearance 
behind, 
On each side are nineteen branchie (fig. 6) of various sizes, but those on the left are, 
on the whole, rather larger than those on the right. ‘They are scanty, and not foliaceous. 
The smaller are simply bifid; the larger consist of three processes set on a common 
prominence; each process is twice bifurcate. The anus is 22 and the genital orifice 
15 mm. from the anterior end of the body. The former is just under the dorsal 
margin, the latter half-way up the side of the body and surrounded with ample folds. 
There is no tail separate from the body. The foot is rounded and grooved in front, 
where it is thickened by a layer of what appear to be glands. 
The pericardium and heart are as usual. The central nervous system is large, but 
no eyes were found. The ganglia are yellow and smooth, showing no signs of grannla- 
