110 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
CHROMODORIS TNORNATA, Pease. 
(Pease, Amer. Journ. of Conchol. vol. vii. 1. 1871, p. 18; and Bergh: Mal. Unters. in 
Semper’s Reisen, Suppl. i. 1880, p. 21.) 
One specimen. ‘The living animal was about 13 inches long, rather narrow 
in shape but flattish with an ample mantle-margin, behind which the foot 
projected for some distance, The texture was very soft and delicate ; the 
gills small. The colour was a rather translucent white with oval spots of 
dark violet ; the mantle and foot were edged with bright yellow, and the 
rhinophores and branchiz were also bright yellow. 
The preserved specimen is much bent, but apparently about 18 mm. lone 
and 6°5 mm. broad. The gills are 12 in number or perhaps 11, one plume 
being bifid. The labial armature is a complete distinct ring composed of 
bent rods, bifid at the tip. The radula consists of about 70 rows containing 
40-50 teeth on either side of the rhachis. The innermost and outermost 
teeth have the structure usual in the genus. The innermost bear 3-4 den- 
ticles on the side next to the rhachis. The remaining teeth are tall, erect, 
and bear six very distinct denticles rather high up. 
This seems to be the Chr. inornata of Pease and Bergh, and is possibly 
a variety of the last species. 
THORUNNA FURTIVA, Bergh. 
(Bergh: Mal. Unters. in Semper’s Reisen, Heft xiii. 1878, p. 575.) 
One specimen dredged in three fathoms, near Hngineer Island, Khor 
Dongola, on a sandy bottom yielding sponge, weed, and polyzoa. 
The living animal was shaped like a Chromodoris, and of a pinkish-white 
colour with a narrow border of bright yellow running round the mantle. 
The gills had each a strip of vermilion on the outer side, and the rhinophores 
were tipped with the same colour. 
The preserved specimen is 8-5 mm. long and 3°5 mm. wide. It is greyish 
yellow with a vivid white border, and has all the external characters of a 
typical Chromodoris. The rhinophores are exserted and very large; the 
branchize retracted into the pocket and apparently 11 in number. 
No trace of a labial armature was found, and its absence seems certain. 
The radula is very small and has a formula of about 25x20.0.20. The 
teeth are as described and figured by Bergh. The innermost are large and 
bear near the tip 4-5 denticles which are difficult to see, since in the 
preparation made of the radula the teeth present themselves vertically to the 
observer. The remaining teeth are tall and slender, bifid at the tip but not 
otherwise denticulate. The second tooth is larger than those which follow it. 
This is undoubtedly Bergh’s Vh. furtiva. Its appearance when alive is 
now described for the first time. 
