1 68 The Irish Naturalist. Septembe 
C. Landsburgii (Aid. and Hanc). — A single immature 
specimen of this, perhaps the most beautiful of all our 
Eolids, was taken in 2 f. in Malahide River, in September, 
1911, on one of the Dublin Field Club excursions. It 
measured 5-5 mm. I secured a second, mature, specimen 
20 mm. in length, in a dredging in 7 f. in Dalkey Sound, in 
May of the present year. Both specimens agreed perfectly 
with Hancock's excellent plate in the " Monograph." 
Not previously recorded for the Dublin shallow-water 
area, but dredged four times in the Irish Sea, off the coasts 
of the county, in from 19-24 f. (Farran '09). 
Tritonia plebeia (Johnston). — In July, 1912, four 
individuals of this species, the largest 18 mm. in length, 
were detected nestling at the foot of a large specimen of 
Alcyonium digitatum attached to an old Pecten shell which 
I dredged in 14 f., off Church Island, Skerries. This associa- 
tion of the Nudibranch with the Coelenterate has been 
frequently noticed. It is a doubtful instance of commen- 
salism, for the Tritonia probably lives not only with, but 
on the Alcyonium. 
I can find no record of this species for the Dublin 
inshore waters, though it has been taken several times off 
the shores of the county, but outside of the 3 -mile limit 
(Farran '09). 
Triopa claviger (M filler). — A single specimen 11 mm. 
long, and agreeing perfectly with Hancock's plate in the 
*' Monograph," occurred to me on the i8th July of this 
year in a dredging made in 2 f. in the channel between 
Colt Island and Church Island, Skerries. 
This appears to be the first record for Dublin waters, 
and for the Irish Marine Province II. 
The results here recorded justify the hope that continued 
exploration will yield further additions to the Nudibranch 
fauna of the Dublin inshore waters, for many species of the 
group already recorded for our Irish poasts still remain 
desiderata in the Dublin list. 
Sandycove, Co. Dublin, 
