132 LIVERPOOL BIOLOGICAL SOCIETY. 
This report is divided into three parts :—(1) the system- 
atic account of the species, (2) some remarks upon the 
epipodial nature of the cerata, and (3) an account of the 
experiments with fishes. The usual tabular view of the 
distribution of the recorded species throughout the district, 
brought up to date, will be found on p. 146. 
Partl. Systematic AccoUNT OF THE SPECIES. 
NUDIBRANCHIATA. 
A. PYGOBRANCHIA (=HOLOHEPATICA). 
Family Doripza.* 
Archidoris tuberculata, Cuvier. 
We have several times lately found this common species 
lying in hollows of large sponges (/alichondria panicea), 
the Nudibranch being in such cases very completely hidden 
from observation. Garstang + has recently noticed this . 
protective resemblance in specimens found at Plymouth, 
and Giard{ has referred to it in discussing the Nudi- 
branchs at Wimereux, on the coast of Normandy. In 
so coloured as to resemble exactly the lmning of the rock- 
1888 we described§ a remarkable specimen which was | 
pool in which it lived. | 
Lamellidoris bilamellata, Linneeus. 
This is the commonest species of Dorid in the Mersey, | 
and although richly coloured with yellow and brown, so 
* We consider the form ‘‘ Doride”’ preferable to ‘‘ Doridide ” as it avoids 
confusion with the family Doridiide formed for the genus Doridiwm. | 
+ Jour. Mar. Biol. Assoc., vol. i. no. 2, p. 174. | 
+ Bull. Sci. de la France, &c., t. xix., p. 492. Giard had also pointed out 
some years before (Arch. Zool. éxpér., t. ii., 1873, p. 487) that this and 
a few other species sometimes resemble the compound ascidians upon which 
—_ 
they live. 
§ Proc. Biol, Soc., L’pool, vol. i., p. 13, 
