OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. Spal 
tion. The pedal ganglia are round, the cerebro-pleural elliptical, with traces of a 
division into two parts. 
The jaws are strong, horny, elongate, yellow, with black edges. They are 10 mm. 
- long and 4°3 wide at the broadest part. The region of the hinges is straight and flat. 
The rest of the jaw curves outwards and is convex. The edge (fig. 7) itself is smooth, 
but behind it are about six rows of stout denticles, which are blackish in the jaw and 
yellowish on the short (1°5 mm.) masticatory process. Behind them are about fifteen 
rows of flatter, roundish prominences, not amounting to denticles. The radula is of the 
type usual in Tritonia, with a formula of 29 x about 50.1.1.1.50. The median (fig. 8) 
tooth is tricuspid, the central cusp, pointed, those at the side blunt. The first lateral 
(fig. 9) is of the usual clumsy shape: the rest (fig. 10) are hamate, moderately stout 
Fic. 9.—Ist lateral. Fre. 10.—Laterals. 
Fras. 9 and 10.—Tritonia appendiculata. 
and moderately curved. The tips are often broken off, particularly near the middle of 
the radula. 
The salivary glands are 8 mm. long, thin, ribbon-shaped above, slightly flocculent 
below. The cesophagus is at first narrow, but rapidly broadens out and enters the thin 
membranous stomach. About half of the stomach is surrounded by the brownish- 
yellow liver, which is itself surrounded by the hermaphrodite gland. The intestine 
leaves the stomach at the point where it emerges from this covering of liver and gland. 
lt is strong and thick, and turns to the right after a slight bend forwards. Both the 
stomach and the intestine were filled with blackish matter, with which were mixed some 
bright red spiculous animal fragments. 
The hemaphrodite gland consists of bright pale-yellow bodies set in colourless jelly. 
The mucous and albumen glands are large, both greyish-yellow. The spermatotheca is 
elongate, with a short duct. The vas deferens is convoluted. The verge is broadly 
conical at the base, with a thin pointed top. 
This species offers many points of resemblance to 7. challengeriana (Bergh, 
TRANS. ROY. SOC. EDIN., VOL. XLI. PART III. (NO. 22.) 78 
