108 MARINE BIOLOGY OF THE SUDANESE RED SBA. 
much the same size: 7:3 cm. long, 2 em. broad, and 2 cm. high. In one 
specimen the gills are quite regular, long, unbranched plumes with minute 
white pinnee, 12 in number. In another specimen, most of the gills bear 
small branches near their tips. In the grey specimen they are very 
irregular and there are numerous small ones at the turned-in ends of the 
line.” (I understand this to mean that the branchiz are set in an incomplete 
circle and that those at the point nearest the gap turn inwards. At this 
point there are numerous small plumes.) 
The specimen from Engineer Island, which is preserved in formol, has the 
branchiee and rhinophores of a brilliant orange, and a line of the same colour 
round the mantle and foot. The other specimens have become black and 
white. They are all remarkably large. 
CHROMODORIS MACULOSA, Pease. 
(Pease: Amer. Journ. of Conchology, 1872, vol. vii. p. 16, pl. 7. fig. 1 *.) 
The notes on the living animal are as follows :—‘‘ Dorid from coral nulli- 
pore reef at the Beacon, Khor Dongola. Elongated and rather flat : mantle 
broad, especially over head. Foot ends in sharp point projecting behind 
mantle. Rhinophores long and erect. Gills small and thick, seven in 
number, simply pinnate, the two hindmost smaller. Foot grooved in front, 
and the groove has thickened edges. Tentacles finger-like. 
“(Colour in the centre a translucent greyish pink. Round this a broad 
undefined band of opaque white, and outside, bordering the mantle, a broad 
transparent orange-yellow line interrupted by opaque white spots along the 
edge. The gills have yellow tips, but the rhinophores are colourless at the 
base and translucent white in the perfoliate parts. Over the central area 
extend clear-cut lines of opaque white, running longitudinally but not quite 
regularly or quite continuously. Round spots of dark crimson-lake are 
sparsely distributed over the same area. The foot &c. are quite white but 
for a row of these spots along the side.” 
The preserved specimen is high and rectangular in shape, 6°5 mm. long, 
3 mm. broad, and 2°7 mm. high. The ample mantle-margin, long tail, and 
lines on the back are still noticeable. The other markings have disappeared. 
The labial armature consists of a ring (which is broken or incomplete) formed 
of bifid, slightly bent rods. The formula of the radula is about 33 x 35.0.35. 
The innermost teeth almost meet across the rhachis; they are stout and 
rather flat, with about 6 denticles outside, and on the inside a shoulder 
bearing 2-3 denticles. The second and third teeth are also stout and flat. The 
subsequent teeth become more slender and erect, with 8-10 distinct denticles. 
The outermost are small and degraded with 4—5 denticles on the tip. 
Tf allowance is made for the fluctuation in colour which is so common in 
Chromodoris, it seems permissible to regard this specimen as a rather pale 
=e 
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