OPISTHOBRANCHIATA FROM THE ABROLHOS ISLANDS, 559 
fold, which is rounded at the anterior end, much wider posteriorly, and 
terminates in a median tongue-shaped projection. The dorsum and sides oi: 
the body are quite smooth. 
Colour. The colour of the preserved specimen is a uniform dull j'ellowish 
brown. Basedow and Hedley (8, p. 143) give a full account of its coloration 
and some excellent figures (8, pi. i.), and Professor Daldn informs me that 
the present specimens agree with them. The general colour is shaded pinkish 
buff and pinkish brown ; the darker colour is more prevalent towards the 
margin. Along the margin of the dorsum are a series of light areas, each of 
which has a violet-purple spot surrounded by a ring of reddish purple. The 
mid-dorsal region is strewn with scattered circular spots of a light violet- 
purple colour, in some cases surrounded by a rim of light j-ellow, and some 
of these lie in front of the rhinophores. The postero-median projection of the 
dorsum is covered with a network of brown lines. The sides of the body are 
similarly coloured to the dorsum, and have a number of small spots approxi- 
mately arranged in three bands : — the upper and lower are of a rich purple 
and the median spots of a light violet-purple. The rhinophores and the 
branchiae are of a rich reddish-orange colour. 
TJimensions. The larger specimen, preserved in spirit, measured : 92 mm. 
along the foot from the tip of the tail to the front end ; breadth of the body at 
the widest part 22 mm. ; height of the body 26 mm. ; breadth of the dorsum 
and mantle at the anterior end 22 mm.; at the posterior end 36 mm.; 
length of tail on dorsal side from the end of dorsum to tip 38 mm. Basedow 
and Hedley's measurements are "length 111, breadth 25^ height 31 mm.," 
so that, allowing for shrinkage, the present specimen was almost the same 
size. 
Head. The head is small and inconspicuous, and is completely overhung. by 
the anterior end of the mantle. The mouth is small and in the form of a 
longitudinal slit running vertically. On each side of the mouth is a short 
sub-conical oral tentacle, which can be retracted into a sort of sliallow pit. 
Foot. The foot is linear, rounded at the anterior end^ passes off to a blunt 
point posteriorly, and its margin is wavy. 
Rhinophores. The club-shaped rhinophores are perfoliate, and the clavus, 
which is a little more than half the total length, bears a number of closely 
packed leaves. Each is completely retractile within a cavity, which has the 
margin of its aperture slightly elevated. 
Branchice. The branchial plumes are twelve in number and incompletel}- 
surround the anal cone. The bases of the plumes show a marked tendency 
to fusion, and the posterior five on each side almost appear to arise from one 
ridge. Each plume is somewhat dendritic in arrangement. 
They are all retractile together with the anus within a cavity that has the 
margin produced into a short tube. 
Raclula. The radula is strong and when removed and flattened measured 
12 mm. by 9*5 ram. The number of rows of teeth is 74-76 and the number 
