ELIOT— NUDIBEANCHS. 433 



Length 58 mm. ; breadth 15 mm. ; height, exclusive of tubercles, 18 mm. 



The coloration is complicated. It may be described as a white ground * covered with 

 a reticulation which is in parts green and in parts purple. The green pigment is light 

 but not bright, and often tinges the white areas in its vicinity. In many places the 

 green is replaced by a rather bright purple, especially on the oral veil, the side-lobes, 

 the dorsal tubercles, and the sides of the body below the mantle-margin. The white 

 areas often bear opaque white spots. Much of the colouring disappeared when the 

 specimen was eviscerated. 



The whole animal, sides as well as back, is covered with low smooth pustules, as much 

 as 3 mm. in diameter. Besides these there is a ridge running down the centre of the back, 

 bearing a small prominence in front of the rhinophores, a rather larger one behind them, 

 and a much larger one (8 mm. high) in the middle of the back in front of the branchiaj. 

 Behind the branchige the ridge is not continued, but there are two prominences of 

 considerable size. Very indistinct ridges seem to run from the central ridge to the 

 side-lappets, and above each lappet is a rather large tubercle. The oral veil is distinct, 

 but not ample, and not divided. It is continued on either side as a pallial margin, and 

 passes behind the branchiae. At this point there is a tubercle, but no prominence that 

 could be called a caudal veil. The tail behind the pallial margin measures 12 mm. The 

 pallial margin bears on either side four lappets (with a fifth rudimentary one on the 

 right) provided on the underside with transverse lameUse. The rims of the rhinophore- 

 pockets are slightly raised, smooth, hard, and white. The branchial pocket is completely 

 closed, but its edge appears to be similar. The rhinophores, which are completely 

 retracted, are large and bright purple, but with yellowish-white tips and yellowish-white 

 lines down the sides, making a vivid contrast of colours. The gills are completely 

 retracted, ten or perhaps twelve in number, for it is difiicult to distinguish branches and 

 independent plumes. They are irregularly tripinnate and pinkish grey ; but the rhachis 

 inside is yellowish white, and, as in the rhinophores, makes a vivid contrast of colours. 



The blood-gland is brownish and irregularly trilobed. The central nervous system is 

 large, but difficult to extract from its capsule. The cerebral and pleural ganglia are 

 united in a single mass, which is somewhat narrow and elongate. The pedal ganglia are 

 distinctly separate from it. The eyes are small and black. 



The buccal mass is large, and the anterior part is of a beautiful purple colour. The 

 labial armature is a yellow band with a white edge. It is 4 mm. broad and appears to 

 be interrupted in the middle, but in reality this interval bears spines of the same kind as 

 the rest, only colourless. They are hooks or bent rods, but not bifid. The radula is very 

 large and has a formula of at least 112 X 250 . . 250. The teeth are small, simply 

 hamate, and irregular in size, tall and short ones often standing side by side. The 

 points are often blunt. The innermost are hard to see, but are apparently like the rest, 

 only stout and with broad bases. The outermost are rather irregular in shape, but none 

 of the teeth are denticulate. 



The right salivary gland is a long band measuring 20 mm. ; the left is only a quarter 

 of the length. The oesophagus is short, and after forming a slight dilatation enters the 



* This description was taken from the preserved specimen some time after the coloured drawing was made. 



