1014- Colc;an. — Opistlwbranrli Fauna of Co. Dublin. 173 
A specimen taken at Sandycux e in June, igoo, lived witJi 
nie for 17 days, and on the 5th July deposited an elliptic 
s})awn coil of two turns measuring 45 nnn. x 29 mm. The 
cream-coloured eggs were irregularly disposed in a double 
layer in the ribbcm which was 9 mm. widc^, and attached 
by its edge like the spawn coil of Archidoris tuhcrculaia. 
Sub -Order — ascoglossa. 
Hermaea dendritica (Aid. and Hanc). 
Rare. A single living specimen 3 mm. in length taken 
(HI coralline at low water, Bullock, April, 1908 : Colgan, '09. 
One specimen, 3-5 mm. long, at low water, Dalkey Island, 
May, 1913 : N.C. 
Elysia viridis (Montagu). 
Xot infrequent, living, between tide-marks and in shallow 
water dredgings. Four specimens taken in 2 f., Malaliide 
River, May-November, 1907-08 : Colgan, '08 and '09. 
On small seaweeds in half-tide pools at Bullock where 35 
specimens were taken in 10 gatherings, 1909-13, from i to 
7 in a gathering : N.C. 
The largest of the Dublin specimens, one taken at Mala- 
liide in May, 1908, was fully 26 mm. long when in motion ; 
another taken at Bullock, January 23rd, 1909, was 22 mm. 
This latter specimen lived in captivity for two months and 
a half, and on the 3rd March laid a flat spawn mass of 3 
coils, irregularly circular or rather rounded quadrangular 
in outline, and measuring 7 mm. x 6 mm. The ribbon, 
which was not attached by its edge but laid flat, was about 
I mm. in width and crossed at intervals by translucent 
bands apparently marking breaches of continuity in the 
process of spawning. The eggs were bluish-white in colour, 
small and very numerous, a rough computation giving a 
total of 10,000 for the whole mass. The radula in this 
species matures early. It was examined in three Dublin 
specimens, one 12 mm., the others each 20 mm. long in 
motion. There was a total of 20 teeth in one of the larger 
