118 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
the liver-cavity acts as a stomach. The liver, though, as usual in Dorids, 
forming one mass, is very loose and easily falls to pieces. 
The hermaphrodite gland forms a very thin layer spread over the liver. 
The penis is armed with hamate spines arranged in rows but apparently not 
extending to the vas deferens. 
I do not see how this form can be identified with Bergh’s A. rubida on 
account of the very distinct difference in the inner teeth. There are also 
minor discrepancies, e. g. in A. rubida the anterior margin of the foot is said 
not to be clearly grooved. But the two species are nearly allied. 
Four more specimens from Dongonab were subsequently received from 
Mr. Crossland in February 1898. They are about 35 mm. long and 17 mm. 
wide. Three are flat, rather soft, with broad feet expanded into thin margins ; 
the fourth is harder, more convex, and the foot is narrower. ‘The colour of 
all is orange-brown of various shades. The pigment is distributed chiefly 
between the warts in a reticulate pattern and is darker in some places than 
others, producing an impression of blotches. The warts are sometimes plain 
grey and sometimes bear 1-3 brown dots. The branchie are 6-7, rather long 
and thin and usually only bipinnate, though tripinnate plumes also occur. 
No labial armature was found, but in one specimen the labial cuticle bears a 
patch of granules or very minute rods not connected intoa plate. The radulee 
are about 60 x 30.0.30. The three or four denticles on the innermost teeth 
are very clear and distinct, but the small denticles on the outer teeth are 
inconspicuous and seem to be reduced to minute ridges. 
Doripopsis RuBRA (Kelaart). 
(See Eliot, in Proc. Zool. Soc. 1904, vol. ii. p. 279.) 
The notes on the living animals are as follows :— 
““(a) In tidal stream of salt water near the canal. Exactly like a Dorid 
in shape, but rhinophores are not retractile into pockets but merely shrink 
inte shallow depressions when touched. There is a shallow gill-pocket, but 
the gills are not retractile into it. They are five, bipinnate, and set in a 
circle open behind. There are no proper oral tentacles; in their place is a 
pair of dull yellow, slightly projecting flaps. Colour, a transparent pink, but 
dorsally this is hidden except at margin and tips of rhinophores by sooty 
pigment evenly distributed, but also found in denser irregularly scattered 
blotches. Under surface of foot pink. 
‘““(b) Later from the same locality, two more specimens ; more pink, e. g. 
rhinophores quite red with white tips. Rhinophores and gills can be retracted 
a good deal when the animal is lively, but far from being put out of sight. 
Largest specimen measures 3°8 cm. x 1°7 em. and foot projects a little behind 
the mantle. 
