SIR C. ELIOT—REPORT ON THE NUDIBRANCHS. 91 
the form is adapted by being drawn out into crests and frills, the edge of which 
is cut into crinkles and points, like the leaves of the common fucus here.” 
Mr. Crossland is no doubt right in regarding all twelve specimens ag 
belonging to the same species, but in their preserved condition they exhibit 
considerable variety not only of colour but of form, due probably not to 
distortion but to different stages of growth. 
A. Hive of them are relatively large, being 18-22 mm. long and 10-15 mm. 
high. 
(1) One is pure white with yellow branchie, which are found only 
inside the wings and on the caudal crest. The wings are rounded. 
(2) As no. 1, but with yellowish-brown margins and spots. The margin 
of the wings is crinkled. Two yecimens. 
(3) In two other specimens there is more green tint. There are 
chocolate markings and also a few brownish ocelli. In these 
specimens the branchize are found outside as well as inside the 
wings. The body is hard and stoutly built ; the wings thickish 
and with strongly crinkled margins. 
B. Seven smaller specimens, 6-14 mm. long and 4-8 mm. high. They are 
all whitish, but with a very variable number of bright brown spots. As a 
rule the branchiz are found only inside the wings. In one specimen they 
also occur outside. In all the wings bear on their edges more or less 
developed digitate processes. In one specimen they are very distinct and 
symmetrical, five in number on each wing. In the others they are more 
irregular. There are also digitate processes on the mantle-edge, especially 
between the wings and rhinophores. 
All the specimens have the following characters in common :— 
(a) There is a moderate but not large caudal crest, more marked and 
more jagged in the smaller specimens. 
(b) There is a row of papille (2-4 can be seen clearly in different 
specimens) on either side of the body, halfway down. 
(c) The wing on either side of the body never consists of two outgrowths 
or papillee rising from separate bases with an interval between 
them as in Seyllea pelagica, but always of a single common portion 
more or less notched or divided at the top. In the smaller speci- 
mens this common portion is about half the size of the whole 
expansion, and the outer part is more or less distinctly bifid and 
bears digitate processes. As the animal increases in size, the 
common portion grows at the expense of the processes, and the 
whole expansion ultimately assumes the form of an undivided fold 
with somewhat crinkled edges, much as in Mr Crossland’s figure 
of Crosslandia viridis, |. ec. 
LINN. JOURN,.—ZOOLOGY, VOL. XXXTJ. 8 
