OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 529 
The central nervous system is much as in Candiella lineata. The ganglia are 
smooth and yellowish ; the nerves white. There is a large common commissure. The 
cerebro-pleural ganglia are pear-shaped, and show signs of a division into two halves. 
~The pedal ganglia are round, and separated from the cerebro-pleural more clearly 
than in C. lineata. The eyes are black and very small. The pericardium is white, and 
as usual in the genus. 
The buccal mass is rather elongate, measuring 12 mm. by 5:5, and strongly 
muscular. The inner parts and the radula have a faint yellowish tinge. The jaws are 
yellow, about 7 mm. long and 4 broad in the widest part, somewhat curved outwards. 
The edge of the jaw and the masticatory process bear five rows of very distinct denticles 
of somewhat varying shape. The radula consists of forty-one rows. Those in front 
are much worn and incomplete. The longer rows contain forty teeth or slightly more 
on each side of the rhachis, so that the formula is about 41 x 40.1.1.1.40.. The central 
tooth (fig. 12) is tricuspid; the first lateral (fig. 13) of the usual clumsy shape; the 
shay , 
Fic. 11.—Frontal veil. ee 
/3 
3 
4 : 5 
2 
Fic, 12.—Median tooth. Fie, 13.—First lateral. Fic. 14.—Other laterals. 
Fries. 11 to 14.—T7ritonia antarctica. 
remaining laterals hamate, and slightly curved at the tip. None of the teeth bear any 
| denticles, and the bases are not large. 
The salivary glands are 5 mm. long, white and flocculent. The cesophagus is rather 
broad, 12 mm. long by 3°5 wide, with rather thin walls, irregularly laminated internally. 
It dilates into a stomach of moderate size, the greater part of which is enclosed by the 
liver. The liver is greyish, and surrounded below as well as above by a thick layer of 
the hermaphrodite gland, which consists of pale yellow bodies set in a colourless jelly. 
There is no trace of stomach plates. The stomach is filled with a yellowish mass, 
containing numerous black particles. 
The spermatotheca measures 5 mm. by 3, and is yellowish, slightly striated, and 
apparently empty. Its duct is 5 mm. long. The albumen and mucous glands are 
moderately large and both white. The vas deferens is longish, not much convoluted ; 
the verge conical, sharply pointed, unarmed, with a coiled duct inside. 
I think that this specimen may be identified with Tritonia pallida, Stimpson, from 
Table Bay, Cape of Good Hope. Differences are not wanting : the white line mentioned 
