SIR C. ELIOT—REPORT ON THE NUDIBRANCHS. 95 
yellowish jaws, about 4 mm. long. They are faintly striated and under a 
high power are seen to bear on the edge low, wavy prominences which can 
hardly be called denticles. From the mouth a tube with laminated walls 
leads into a small yellow stomach, which is armed with 19 or 20 plates and 
prolonged posteriorly into a dark-coloured tube. The plates are rather bright 
yellow in colour, hog-backed in shape, and alternately large and small. The 
larger are about 3°5 long and ‘5 mm. high; the smaller half the size. The 
liver is a flocculent and rather diffuse collection of brown tubes, spread over 
and between the globules of the hermaphrodite gland and lying behind the 
stomach. Two accessory portions of the liver open into the stomach right 
and left. The branches of the liver which go to the cerata are more compact 
than the main mass. Up to the bases of the cerata they are of a considerable 
size (about 3°5 mm. broad), but after entering the appendages they contract 
and become much narrower. They extend about two-thirds of the way up 
the cerata and divide into two or three branches. 
The hermaphrodite gland consists of a number of spherical globules which 
occupy a considerable portion of the body-cavity. There is a large, soft, 
round prostate, from which issues a strong and muscular vas deferens. The 
penis is large and distinctly hooked in both specimens. The fan-shaped 
organ described by Bergh in some species was not found, but near the end 
of the female branch is a large sac-like organ which is exserted in one 
specimen so that the orifice lies at the bottom of it. 
This appears to be the JZ. bucephala of Bergh. The shape of the hood is 
the same in both specimens, and does not look as if it were due to distortion 
or mutilation. 
Although the generic characters of JMelibe are remarkable and easily 
recognizable, the specific distinctions within the genus are very indefinite 
and few of the species can be regarded as certain. It is probable that they 
all have jaws, though the contrary has been asserted and I was unable to 
find any in a specimen of JZ. pilosa which I examined in Japan both while it 
was alive and directly after death. The jaws usually lie immediately below 
the lips, and the difficulty of finding them is probably due to the fact that in 
death the buccal parts may be abnormally protruded or retracted so that the 
jaws become situated in an unexpected place. 
AQOLIDIELLA ORIENTALIS, Bergh. 
(Bergh: Mal. Untersuch. in Semper’s Reisen, Heft xvii. p. 875; ad., Beitrage zur 
Kenntniss der Aeolidiaden, [X., in Verhand. der k.-k. zool.-botan. Gesellschaft 
in Wien, 1888, p. 673.) 
Five specimens said to have been found “in the washings of coral Kc. 
from a buoy in Suez Bay.” The notes on the living animals are as follows :— 
“Small, white with orange-red markings. Short and stumpy in form. 
