1914. CoLGAN. — Opistliobninch Faiaia of Co. Dubliji. 181 
remarkable degree. The tail is very long and flexible, and 
acts most effectively as a prehensile organ. The colours 
are so admirably protective that it is almost impossible to 
detect the animal when at rest, so well do its tints harmonize 
with the capsule-bearing Obelia on which it feeds. Its 
presence is usually betrayed by the numerous white egg- 
clusters, for the species spawns with great freedom. No 
les^ than 70 distinct kidney -shaped clusters were counted 
in July, 1913, on an i8mm. length of Chorda filum clad 
with the Obelia, and an individual isolated on the 12th 
July of that year laid 5 distinct egg-clusters within 48 
hours. Examination of the radula in 9 specimens from 2 
to 4 mm. long showed that the number of teeth ranged 
from 16 to 25. 
Embletonia pallida (Aid. and Hanc.)- 
Rare. In August, 191 1, while examining some hydroids 
collected off Shennicks Island, Skerries, I detected two 
specimens of Embletonia, one 2-5 mm. the other 2 mm. 
in length, associated with Tergipes despectus and Galvina 
exigua on Obelia dicJiotoma. The larger specimen had on 
either side of the body a double row of yellow papillae 
tipped with orange, those towards the central part much 
longer than the others ; the smaller specimen was a pale 
whitish yellow in colour, and bore only a single row of 
papillae on either side. The first agreed in form and colour 
with Alder's original description of E. pallida in Jeffreys' 
Conchology , vol. v., 1869, and differed only in its brighter 
coloration from Hancock's figure of that species given in 
Part VIII. of the Monograph (Ray Socy., 1910) ; the second 
agreed perfectly with that figure in colour, but differed 
from it in the absence of a second row of papillae. The 
larger specimen may safely be referred to E. pallida, and the 
smaller may perhaps have been an immature state of the 
same species : Colgan, '13 A. 
In the Fauna der Kieler Bucht of Meyer and Mobius, 1865, 
this species is recorded with a figure and full description, 
and the record has been accepted by Alder in his account 
of the British Nudibranchs in Jeffreys' Conchology, 1869. 
A 6 
