OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 521 
Breadth, including 
Length. Gerata, 
mm. mm. 
(2) 108°5 33°5 
(3) 50 33 This specimen is exceptionally 
broad. 
(4) 59 19 Long and slender. 
(5) 43°5 20 
(6) broken in two, 
but about 54, 19 
All the specimens except the last were captured at Station 325, Scotia Bay, South 
Orkneys, in 9-10 fathoms. In two cases it is recorded that the temperature was 29° 
Fahr. The last specimen was found in a shore pool, Scotia Bay, South Orkneys; 
temperature, 30° Fahr. It is much damaged, nearly all the cerata being broken 
though not detached, but it probably belongs to the same species as the others, the 
anatomy being identical. 
The body, rhinophores, and tentacles are of a dirty white ; the cerata are of a faded 
pink, but this tint is stronger in the large specimens that in the smaller ones. The skin 
appears to be naturally smooth, but in some specimens is covered with wrinkles and 
blisters, apparently caused by the preserving fluid. When the integuments are held 
up to the light (but not otherwise), a network formed by intersecting bundles of fibres 
ean be seen within the skin. This pattern is much more developed in some specimens 
than in others. 
The largest specimen is 122°5 mm. long, 35 high, and 39 across the broadest part 
of the back, including the cerata. The shape and proportions of the body somewhat 
recall Tritonia, but the external characters are those of an aeolid. The foot is broad, 
with expanded margins, and measures 30 mm. at its widest part. It is rounded and 
grooved in front, with no trace of tentacular prolongations at the sides. 
There is no trace of a frontal veil, but the oral tentacles which rise on each side 
of the mouth are unusually large and stout, being about 20 mm. long and 6 wide at 
the base. They are curved upwards and inwards, so as to present the appearance of a 
erescent when seen from the front. Between them is a slight prominence. The rhino- 
phores are about 6 mm. behind the oral tentacles and close to one another, the interval 
between them being only 4°55 mm. They are 10 mm. high, and bear respectively 
fifteen and seventeen rings, most of which run completely round the stalk, though the 
last few are less regular, and interrupted here and there. 
The cerata amount to about 800 on each side, that is, 1600 in all. They are set 
upon the dorsal margin, which is sinuous as in Lomanotus, with five undulations 
outwards and as many inwards. They begin slightly before the rhinophores, but on 
the lateral, not the anterior margin of the body, and are continued until its posterior 
termination, the tail projecting only 5mm. They are of varying size, the tallest being 
about 18 mm. high, 4 mm. broad at the base, and 2 at the tip. The colour is faded 
pink. The largest are inside; the smallest, which are mere tubercles, less than 1 mm. 
