DORIS. 109 
attains three inches in length, is of a yellow 
colour, with the mantle covered with small round 
warts. Hence in size, form, hue, and surface, the 
animal bears no small resemblance to the half of a 
lemon cut through lengthways, especially when 
the branchial plumes and the dorsal tentacles are 
concealed by being withdrawn into their respective 
cavities. But the colour is not always plain 
SEA LEMON. 
yellow ; it sometimes verges to grey, and is fre- 
quently marked in the most beautiful manner 
with large spots and clouds of crimson or purple. 
The branchial flower is composed of eight plumes, 
which are large, tripinnate, and of a_ bluish 
white hue. 
This species is said to be more common on the 
east coast of Scotland and England than on the 
west. I have, however, found it on the shores of 
Dorset and of north and south Devon; it lives 
among the rocks, in the zone bounded by the 
limits of high and low tide, as well as in deep 
water. In captivity, the habit of this, as of some 
other species of the genus, is to glide slowly round 
and round the vessel in which it is kept, just beneath 
