ON THE NUDIBRANCHTATA. 21 



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 



FIG. 11. Frontal veil. 



FIG. 13. Median tooth. FIG. 13. First lateral. FIG. 14. Oilier laterals. 



FIGS. 11 to 14. Tritonin anlarctica, 



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 ossophagus 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 pall/da, Stimpson, from 

 Table Bay, Cape of Good Hope. Diiferences are not wanting : the white line mentioned 



(ROY. soc. EDIN. TRANS., VOL. XLI., 529.) 



