SIR C. ELIOT—REPORT ON THE NUDIBRANCHS. oe 
crinkled when crawling and are carried upright. Large specimen 3 cm. long, 
sonalllledi= 7 2 
Three specimens are preserved. They are whitish, with a plain grey 
border to the wings and rhinophores, and a few grey spots scattered over 
the upper and under surface, and in one specimen especially numerous on 
the pericardium. In some specimens there are also traces of yellow 
coloration. 
The largest specimen, which is leaf-like and somewhat crumpled, is about 
27 mm. long and 22 mm. broad. Could it be spread out flat, the dimensions 
would be rather greater. The anterior genital mass is blackish and is visible 
through the skin, as are also the follicles of the hermaphrodite gland which 
extend almost to the edges of the wings and give the dorsal surface a mottled 
appearance. ‘The veins on the back are very prominent and distinct. The 
pericardium is considerably prolonged in two specimens, as in Kelaart’s 
figure. In the third this prolongation is less noticeable and the organ is 
constricted in the middle so that its shape is that of an hour-glass. 
The radula in the specimen dissected consists of 5 teeth in the ascending 
portion, 18 in the descending, and about 15 in the heap. The teeth are of 
the usual shape. The tip is not very pointed and the anterior part of the 
lower edge is minutely serrulated. This serrulation is visible only under the 
highest powers and then with difficulty, but still it can be detected on ali 
the teeth, even the small ones. 
It is doubtful if many of the described species of Llysia will ultimately 
prove valid. Kelaart’s names (grandifolia, punctata, and caerulea) have 
priority. The last of these (= LE. lineolata, Bergh) is clearly distinguished 
by its brilliant coloration. In the others the coloration (especially the 
borders and spots) is very variable, and there are few other definite specific 
characters. The teeth of E. grandifolia are serrulate and those of other 
species smooth, but since the serrulation is only visible under the highest 
powers its absence cannot be assumed unless a very thorough search has 
been made. 
HEXABRANCHUS. 
The animals of this genus are very variable in shape and colour, and few 
of the described species can be regarded as certain and well characterized. 
‘the species or variety noticed below is undoubtedly the H. pretextus of 
Ehrenberg (1831), but there can be equally little doubt that it is also the 
Doris sanguinea of Riippell & Leuckart (1828), and this specific name must 
therefore have priority. 
The HZ. punctatus recently described by Bergh (‘ Siboga’ Expedition, 1905, 
p- 92) is, I think, the same as the animal described by me under the name of 
HH. adamsii (?) in the Proceedings of the Malacological Society, 1905, p. 235. 
The species is probably the animal figured by Adams, though as we have 
