l66 The Irish Naturalist. September, 
papulosa, but an examination of the radula brought to 
Hght the double -arched tooth characteristic of the neigh- 
bouring genus Aeohdiella, while the number of denticles, 
from 23 to 25, in each arch fixed the species as A. Alderi. 
From the only other well-established Britannic species of 
this genus, A. glauca, the present species is distinguished 
by the smaller number of its teeth (about 15) and of their 
denticles. A specimen of A. glauca 22 mm. long, which 
I dredged at Skerries two months later, gave a radula of 
20 teeth with from 33 to 46 denticles in each arch. 
Not previously recorded for the inshore waters of the 
county, but taken in Lambay Deep, 41-52 f. in 1907 
(Farran '09). 
Cratena amoena (Aid. and Hanc). — This species occurred 
to me in four different dredgings off Skerries and Dalkey, 
a single specimen being taken in each of the following 
hauls : — (i) in 13 f. off Church Island, August, 1911 ; (2) 
in 14 f. off the same island in July, 1913 ; (3) in 2 f. off Colt 
Island, Skerries, July, 1913, and (4) in I4f. to the south 
of Dalkey Island, July, 1913. The largest specimen was 
6-5 mm. in length. All four agreed closely in form with 
Hancock's figure in the " Monograph," and all bore the 
brown band there shown on the rhinophores ; but in none 
was the colour of the papillae so distinctly green. It varied 
from dull brown to sage green. The radula agreed with 
the figure in the "Monograph" ("Tongues of the Eoh- 
didae") the number of teeth in the 5 mm. specimen ex- 
amined being 16. 
Not previously recorded for East Ireland. 
C. viRiDis (Forbes). — Twice dredged off Church Island, 
Skerries, in from 13 to 14 f., once in August, 191 1, when 4 
specimens were taken, the largest 6 mm. in length, and 
again in July, 1913, when a single specimen was taken, 
5 mm. long. In form and colour all of the specimens agreed 
closely with Hancock's plate of the species in the " Mono- 
graph." The radula of the 5 mm. specimen was examined, 
and this, too, agreed weh with Hancock's figure in his plate 
" Tongues of the Eolididae." It was long and slender, 
and made up of 30 teeth, each with about 5 denticles on 
