106 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
described .by Bergh, J. c. (“ Lippenplatte. ... nur aus héckerartigen 
Verdickungen der Cuticula bestehend ’’). 
The formula of the radula is about 24x 1+1.0.1-+1, and the teeth are as 
usual in G. castanea. The large tooth has a broad base and a kink in the 
back. It bears no denticles. The small tooth is hard to see. It is little 
more than a plate with a mark which may be a jag or a vestigial hook. ‘The 
ingluvies bucealis is small with a very short thick stalk. 
The vas deferens is armed with spines set on flat plate-like bases. 
This form does not appear to be identifiable with any of the known tropical 
species of Goniodoris. It cannot be G. modesta, which has a long thin tail, 
or G. citrina, which has a lobed mantle margin and denticulate teeth. 
G. aspersa, which is more like it, is said to have rudimentary jaws, like 
Acanthodorts pilosa, and also a smooth back and a reflexed mantle-margin. 
On the other hand, the present specimens agree in most points with the 
descriptions of G. castanea, though the labial armature is perhaps even less 
definite than as described by Bergh. ‘The distribution of this species is 
very remarkable. It is recorded from the N. Atlantic, the Mediterranean, 
and New Zealand (Bergh, in Semper’s Reisen, vi. il. p. 89), where it was 
found on the keel of a ship which had been sixteen months in Otago Harbour. 
It may be wondered whether its presence at Suez is due to natural distribu- 
tion or to artificial importation from the Mediterranean. 
(HROMODORIS DIARDI (Kelaart). 
= Chr. sempert, Bergh. 
(Eliot: “ Nudibranchs of 8. India & Ceylon,” Proc. Zool. Soc. 1906, p. 648.) 
Nine specimens found on sponges dredged at Port Tewfik and Suez. 
The following are Mr. Crossland’s notes on one of the Port Tewfik speci- 
mens :—‘“‘ Elongate, high body with a narrow mantle, which however is 
kept down in crawling. Length 1:6 em., breadth 0°35 cm. Gills 11, small, 
the anterior ones largest, set in a circle open behind. Pinnules very small ; 
a vermilion band on outer and inner edges of gills: the rest white. Both 
the rhinophores and gills are retracted with difficulty and soon reappear : 
the rhinophores are taller than the gills. Colour creamy white with bluish- 
grey mottlings. Both colours have deeper tints on raised blotches, the 
former becoming rich cream and quite yellow towards the mantle-edge, the 
latter like blue-black ink with pure vivid dark blue at the margins in some 
cases. In front of the rhinophores are three black and two cream-coloured 
blotches. The foot is very ight blue with blue and blue-black spots. There 
is little cream-colour except near the edges. The foot projects behind the 
mantle when the animal is crawling.” 
The preserved specimens are of a greyish colour with markings (which 
take the form of dots as well as of larger blotches) of dark blue and 
