1914- CoLGAN. — Opisthobranch Fauna of Co. Dublin. 
179 
it is reasonable to infer tliat the difference < ii\ tlieir radiilae 
are permanent. So, for the present, at k'.ast, it seems 
inad\ isable to fuse the two species. 
Cratena amoena (Aid. and Hanc), 
Eolis amocna. 
Rare. Dredged four times off Skerries and Dalke}', a 
single specimen in each dredging, in 13 f. off Church Island, 
August, 191 1, in 2 f. off Colt Island, and in 14 f. off Church 
Island in Jul}', 1913, and in 14 f. south of Dalkey Island 
in the same year and month ; Colgan, 'ijA. 
x\ll of the specimens agreed in form with Hancock's plate 
in the Monograph, though in none was the colour of the 
papillae so distinctly green. It \'aried from dull brown to 
sage green. The brown band on the rhinophores was 
present in all, and the radula agreed closely with the hgure 
in the Monograph, the number of teetli in a 5 mm. specimen 
examined being 16, and in a 6-5 mm. specimen, the largest 
taken, 20. The horn-coloured buccal bulb showed clearly 
through the pellucid tissues of the bod\', and the hepatic 
branches seen passing along the back into the papillae 
formed a pale coloured zig-zag pattern resembling, though 
less conspicuous, that so distinctive of Tergipes despedus. 
In the largest specimen a monstrosity appeared in the 
fusing for one-third of their length of two of the larger 
papillae, the free ends diverging in a wide fork. 
C. viridis (Forbes). 
Eolis northumhrica (Aid. and Hanc.) 
Rare. Dredged twice off Church Island, Skerries, in 
from 13 to 14 f., once in August, 1911, when 4 specimens 
were taken, the largest 6 mm. long, and again in Juh', 1913, 
when a specimen 5 mm. long was taken : Colgan, 13A. 
In form and colour these specimens agreed well \\ith 
Hancock's figure in the Monograph. The radula of the 
5 mm. specimen was examined. It was long and slender, 
and made up of 35 teeth, each with about 5 denticles on 
either side of the slightly prominent median denticle, which 
