SIR C. ELIOT—REPORT ON THE NUDIBRANCHS, LES 
PERONODORIS DENTICULATA, sp. Nov. 
The notes on the two living animals are as follows :—(1) “ Regular oval 
shape ; high back. Very sluggish. The back is ridged all over, more or less 
in a network pattern, but the main lines are one longitudinal mid-dorsal and 
others running out laterally. Six gills, bipinnate, small, sparsely and irre- 
gularly branched, grey but bright light yellow in the distal parts. Rhino- 
phores of the same colour. Gill-pocket with six teeth, of which the posterior 
is much the largest. Measurements 1°3x1:0 em. General colour a cool 
grey, formed by specks on a whitish ground, and there are small white dots 
scattered about. The ridges are of a darker tint, more of the grey specks 
being present on them, and at intervals are raised into small light yellow 
warts which are especially well developed where two of the ridges meet or 
cross. Hound by diver, Suakim Harbour, one or two fathoms.”—(2) “ Picked 
up from the deck after divers had brought in a quantity of coral. In many 
respects like the preceding specimen, e. g., in having a raised network and 
warts, though the arrangement of the ridges is not so regular. The gills 
also correspond. Body rather stiff and leathery, but not harsh to the touch : 
like india-rubber. Foot narrow. Animal fairly active. Oral tentacles long. 
Ground-colour a mixture of grey, light and dark brown, and yellow, the 
brown being confined to the visceral mass ; at Junction of this and the mantle 
are large oval brown spots, four on the left, two on the right side. Under 
side yellowish white with specks of brown. The raised network and the 
warts are yellow.” 
The preserved specimens agree fairly well with the above description. 
The edges of the rhinophore pockets are slightly raised and bear short irre- 
gular processes. The branchial pocket is also slightly raised and partially 
closed by not very distinct tubercles. The anterior margin of the foot is 
grooved, but it is not clear if the upper lamina is notched. The oral tentacles 
are short, stout, and distinct. 
The blood-gland is greyish, thin and shadowy. ‘The central nervous 
system is strongly granuiated and distinetly divided into two halves, each half 
being less distinctly divided into three ganglia. The salivary glands are 
short and rather thick. The formula of the radula is in one specimen 
32 x 30.0.30 in the longest rows, and in the other 28 x 28.0.28. The teeth 
are hamate and increase in size outwards. The innermost have long bases 
and low hooks ; those in the outer third of the row are large and stout ; the 
last three are smaller but not denticulate, though sometimes jagged. A few 
of the inner teeth (in one specimen the first four counting from the rhachis, 
in the other the first six or seven) bear one minute denticle, more rarely two, 
on the outer side. The tooth next to the rhachis has also a denticle on the 
inner side. The denticles are larger in one specimen than in the other. No 
labial armature was found. The vas deferens is short and unarmed. The 
