236 Proceedings of the Royal Irish Academy. 



Prionospio Steenstrupi, Malmgreu. 



1867. Malmgren, Auuulata Polychaeta, p. 93. 



5 mUes N.N.E. of Balbiiggan (S. 252. 20, ii, '05. Townet on trawl, 11-13 

 fms.]. 



A single small and immature specimen of PHonospio was taken in the 

 townet off Balbriggan. I refer it to the above species on account of the 

 structure of the branchiae, which have two rows of branches. The branchiae 

 are small, and the branches few in number. Eyes are absent. The bifid 

 hooks appear in the 12th setigerous segment, and the upper fang is minutely 

 bifid. The peculiar curved "bayonet" seta is present in the ventral branch 

 of the parapodium. 



This species belongs to the small group of species with a northerly distri- 

 bution, which is found in the northern part of the Irisli Sea. 



The genus Prionospio has not previously been recorded from tlie British 

 Isles. 



General Distribution. — Norway ; Iceland ; Greenland ; Eastern North 

 America. 



Polydora ciliata (Johnston). 



1896. Mesnil. Tom. cil., p. 210. 



Malahide, 1SS7 (Mel.). 



llowth, south shorc, 6, X, '09 ; north shore, 10, x, '09, in crevices of the 

 rock. 



Salthill. 



General DistribiUion. — British Isles ; shores of Atlantic ; Mediterranean ; 

 Baltic ; Pacific. 



Polydora flava, Claparede. 



1896. Mesnil. Tom. cit., p. 182. 



Howth, south side, 6, x, '09. 



Not previously recorded from Ireland. 



General Distribution. — Great Britain ; France ; Mediterranean. 



Family CIRRATULIDAE. 



Cirratulus cirratus (Miiller). 



1843. Eathke. Bciti-age zmx Famia Nor\vegen8, p. 180. 



Dalkey Sound (Thompson, 1856, p. 428). 



Salthill. 1881 (McI.). 



Poolbeg breakwater, 11, iii, '07. 



10 miles east of Nose of Lambay (S. 553. 16, viii, '07. Trawl, 41-52 fins.). 



