SIR. C ELIOT—REPORT ON THE NUDIBRANCHS. 1A 
Mr. Crossland says of the living animal :— 
“ Length 45 mm., breadth of body 10 mm., total breadth (inclusive of 
appendages) 27 mm. Rhinophores as usual. Welum with five tentacular 
projections on each side, of which the middle one on each side is long, the 
outermost is spatulate. Body not so high and square in section as in Titonia, 
lower and more rounded. Foot broad. 
“The dorsal appendages are remarkably large ; there are 9 pairs, all of 
which are large except the hindmost. They increase in size from the head to 
the middle of the body, after which size remains practically the same with 
exception of the last pair. They are six times branched ; this complication 
of branching and their size and shape recall the gills of a Dorid. 
“The normal position of the main stem is at 45° to the vertical, the smaller 
branches spread out more or less in one plane, and the plumes cover most of 
the back and all the space between consecutive appendages. 
“Colour very striking. Body primrose-yellow, orange along sides of back. 
Thicker branches of gills also light yellow, but the finer branches are a light 
bluish green. This colour is also found on the velum and covers the rhino- 
phores. On the middle of the back is a network of blotches of umber-brown. 
“As the creature crawls the anterior appendages rhythmically bend over the 
back and then outwards ; the motion arises in the bases of the main stems, 
not by contractions of the dorsal body-wall. 
“In spirit the back appears rather warty; it was not so in life, and I do not 
know to what the warts correspond, possibly to yellow dots enclosed by the 
brown network.” 
As preserved, the animal has entirely lost its beautiful colour and is of the 
brownish tint usual in alcoholic specimens, but traces of bright light yellow 
remain on the branchie. 
The shape is as described by Mr. Crossland and also corresponds with 
Ruppell and Leuckart’s figure. The foot, as preserved, is pointed in front with 
a line or very shallow groove on the anterior margin. The tail is short and 
lidden by the posterior branchize. The genital orifices are on the side, below 
and between the first and second branchie. The anus is latero-dorsal and lies 
just in front of the fourth branchia. The rhinophore-sheaths are rather tall, 
with wavy but not denticulate margins ; the club is surrounded by branched 
processes which adhere closely to it. The branchize look like small trees. 
There is at the base a thick, longish common stem; this divides into three 
main branches, which are again subdivided into three, and these subdivisions 
are tripinnate. In all the plumes the division seems to be with few exceptions 
consistently tripartite. 
When the animal is opened, the large heart and pericardium are conspi- 
cuous objects lying almost in the centre and only slightly to the right of the 
median line. The central nervous system is as depicted in Bergh’s plates of 
