SIR C. ELIOT—-REPORT ON THE NUDIBRANCHS. 117 
1-3.cm. Of the typical shape, neither flat nor high, soft but firm in texture. 
Gills six, rather small, tripinnate, completely retractile ; pockets drawn out 
transversely and anterior lip trilobed. Foot in crawling moderately broad, 
but becomes very narrow when the beast is laid on its back. 
“Of somewhat varying colour. One specimen is on the whole brown ; 
another grey with but little brown ; the third intermediate between the two. 
The back is quite covered with warts, round and of different sizes. They are 
light brown, mottled with opaque white or light drab. The narrow spaces 
between the warts are brown, with more or fewer chocolate marks. The 
depth of this colour varies in different parts, so that the body is mottled grey 
and brown.” 
The preserved specimens correspond fairly well with this description. 
The anterior margin of the foot is grooved and the upper lamina notched. 
The rhinophore pockets are protected by two not very conspicuous valve-like 
tubercles, between which on both sides are a number of small tubercles. 
There are also tubercles on the rim of the branchial pocket, but though 
distinct they are not specialiy modified. 
The integuments are not very hard, but full of white spicules, fairly 
straight but often jointed or broken. The liver and other internal organs 
are brown or grey of various shades. The blood-gland is large, thick, and 
greyish white. The central nervous system is granular and somewhat 
concentrated, the two sides as well as their component ganglia being close 
together. The division between the cerebral and pleural gazglia is not clear. 
The pedal ganglia are set on a distinctly lower level. somewnat at the sides of 
the cesophagus. 
In the two specimens dissected no trace of a labial armature was found. 
In both the radula is somewhat crowded and disordered. It consists of 25 
rows in one specimen and of 27 in the other. In the first the number of 
teeth on each side of the row does not much exceed 40 ; in the other it is as 
much as 55 in some rows. There is no central tooth. The first lateral is 
rather broader than the others and bears three or four denticles on both sides. 
These denticles are rather irregular and extremely difficult to see, as the tooth 
stands vertically and I was not successful in obtaining a side-view, but their 
presence is certain. About the ten outermost teeth bear a variable number 
(5-12) of very irregular small denticles on the lower side of the hook. The 
remaining teeth are apparently smooth and simply hamate. The outermost 
six teeth or so are thinner than the others and sickle-shaped, with smaller 
bases. This formation is more conspicuous in one specimen than in the 
other. 
On issuing from the buccal mass the cesophagus is about 1 mm. broad, but 
it expands shortly afterwards into a dilatation about 4 mm. long and 3 mm. 
broad. After this it again contracts to its original dimensions and runs into 
the liver. There is no stomach outside the liver, and it would appear that 
