96 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
Rhinophores and cerata short and simple. Rhinophores not perfoliate ; eyes 
just behind them, conspicuous. Foot broad, especially in front, but no pedal 
tentacles. Oral tentacles fairly long. 
“ Body translucent, but ends of rhinophores whitish and the greater part 
of their length orange-red. A V-shaped (inverted) mark behind them of the 
same colour, and two broad marks running forward from the base of the 
rhinophores. There are faint sprinklings of the same pigment over cerata 
and body. ‘There are on the back whitish marks as shown in the sketch, and 
a very faint brown tinge (due to the liver) in the bases of the cerata.” 
A rough sketch shows a A between the eyes, and behind them a pattern 
having somewhat the shape of a Greek vase without handles extending down 
the centre of the back. 
The largest of the preserved specimens is 9 mm. long and 2°5 mm. broad. 
The others are rather smaller. The cerata are not arranged in any visible 
groups, but are set three or four deep all along the sides of the body, as far 
as the tip of the tail. On either side there are about 30 cerata of moderate 
size, and outside, in the outermost line, ten or twelve minute ones. The 
cerata are fusiform in shape but occasionally dilated at the tips. 
The jaws are yellow; the edge is undulated but no denticles were seen. 
The radula consists of only twelve teeth. The shape of the smaller teeth is 
much as in Bergh’s plates (/. c.), but in the larger ones the central part is 
much more developed and more conspicuous, so that the whole looks like a 
shield with two pectinate wings. The median denticle is fairly strong with 
a minute denticle on either side. The wings bear from 14 to 20 denticles. 
No armature was found on the genitalia. 
In spite of some slight differences of coloration this seems to be Bergh’s 
Molidiella orientalis, which is distinguished from the other species by having 
the anterior margin of the foot rounded and not produced into pedal tentacles. 
In Bergh’s specimen the lateral denticles of the teeth were more numerous 
and the radula longer, but the animal was also considerably larger (23 mm., 
whereas these specimens are only 9 mm.). As the radula grows the teeth 
become more numerous, and it is clear from the present specimens that the 
later teeth grow broader and bear more denticles. 
ELYSIA GRANDIFOLIA, Kelaart. 
(Kelaart: Ann. & Mag. Nat. Hist. 1859 (8), iii. p.493 ; Eliot: “ Nudib. of S. India & 
Ceylon,” Proc. Zool. Soc. 1906, p. 689.) 
The notes on the living animal are as follows :—‘“ Under stones, reef- 
edge N.H. boundary of Shabul Shubuk. Rather a dull green, mottled 
with darker spots. Hdges of lateral expansions with a thin clear black 
line, within which'is a rather broader yellow line. Rhinophores edged in 
the same way but neck is green all over. The lateral expansions are much 
