SIR C. ELIOT—REPORT ON THE NUDIBRANCHS. ul 
PLATYDORIS INCERTA, Eliot, juv. 
(Eliot: Proce. Zool. Soc. 1903, vol. ii. p. 378.) 
One small specimen. Locality not mentioned. The notes on the living 
animal are as follows :— 
“ Found on a smooth leafy sponge of a grey-green colour. The nudi- 
branch is of very nearly the same tint, except for a slightly wavy brown line 
from between the rhinophores nearly to the gills. Gills five, small, bipin- 
nate: their pinnules are of a darker grey than the body. The perfoliated 
parts of the rhinophores are yellowish brown. 
“Foot broad: grooved and notched in front. Oral tentacles distinct and 
fairly long.” 
In the preserved specimen the rhinophores are retracted and the pockets 
are large holes with edges not much raised. The branchial pocket is stellate. 
There is no labial armature. The radula consists of 60 rows, containing 
20-30 teeth on each side of the rhachis. The teeth are hamate, colourless, 
and increase in size as they are further from the rhachis. The outermost are 
degraded but not denticulate. The vas deferens bears a thick armature of 
spines on stout bases, of the type characteristic of the genus. 
These specimens seem to belong to Pl. incerta aescribed by me from 
Zanzibar, which is probably the young of some other species. 
DISCODORIS AMBOINENSIS (?), Bergh, juv. 
(Bergh: Mal. Unters. in Semper’s Reisen, Heft xvii. 1890, p. 895.) 
One specimen unaccompanied by notes. It is flat, 21:5 mm. long, 18 mm. 
broad, and the shape and external characters are as usual in the genus. The 
rhinophore pockets are slightly raised and the branchial pocket is crenulated. 
The branchiz are five or six. The back is granulate or papulate, yellowish 
brown with darker mottlings. The coloration of the under side is similar, 
but the mottlings are concentrated in more distinct purplish spots. The 
labial armature is an incomplete ring composed of yellow rods. The formula 
of the radula is about 26x 40.0.40. The teeth are of the ordinary hamate 
type: the outermost are small and slender but not denticulate. The genitalia 
are not armed in any way. 
This appears to be an immature Jiscodoris, perhaps D. amboinensis. 
Another small Discodoris from Dongonab was received, in a slimy and 
semi-decomposed condition. The entire mantle-margin had been cast off 
by autotomy and remained as a separate complete ring. The animal is 
perhaps a young specimen of Liiscodoris fragilis, Alder & Hancock. 
