530 SIR CHARLES ELIOT ON THE NUDIBRANCHIATA 
by Srumpson is not visible, and the arrangement of branchie is not quite the same. But_ 
though Srimpson’s description is very slight and superficial, the similarity m colour and — 
in the structure of the frontal veil seems suthciently great to warrant identification m 
specimens from the same coast. 
This form offers resemblances to Tritonia (candiella) australis and imgolfiana, but — 
both of these have the first lateral tooth denticulate, and differ in other details. 
Tritonvopsis, gen. nov. 
The teeth of this form seem to differ from those of Tritonia too decidedly to allow 
of its being included in the same genus. Whereas in Tritonia the median tooth is broad, 
and the first lateral lower and of a more clumsy form than the others, in Tritoniopsis 
the median tooth is narrow and pointed, without wings or accessory cusps. The first 
lateral does not differ markedly from the others, but the outer laterals are very long and 
almost filamentous in appearance. 
In the only known species there is one longitudinal and several transverse ridges 
on the back; the rhinophore sheaths bear appendages resembling branchie. 
I have dedicated the species to Mr Brucz, leader of the Expedition. 
Tritomopsis brucei, gen. et spec. nov. 
Three specimens. The label says “ April 22, 1904. Fathoms 10. Temperature 
55 H ‘Gough Island.” 40> 200559" S6OW: 
The animals are of a innispanen white (in one specimen with a slightly bluish 
tinge), allowing the yellow viscera to be seen through the integuments. 
Fie. 15.—Branchia. Fic. 16.—Frontal veil from below. 
Fias, 15 and 16.—Tritoniopsis brucei. 
The largest specimen is much bent, but would measure about 22 mm, in length if 
stretched out. The breadth is 8 mm., the height 8:5. The others are slightly smaller. 
In all the shape is high and rather narrow, rising up from the head to the centre of the 
back, and then sloping down to the tail. 
On the dorsal margin, which does not project, are twelve to fourteen branchial tufts 
(fig. 15), of which the alternate ones are larger and set more inward, whereas the smaller 
are directed outwards. The longest do not project more than 2 mm. from the body and 
are stout, but not at all arborescent or foliaceous. They consist of two or three stems, 
arising from a prominence which hardly amounts to a common stalk. Hach of these 
