47 100 Proceedings of the Royal Irish Academy. 



bay it is not so common. It was found living in the sand of a very exposed 

 Zostera bed. 



Habitat. — BLACKSOD Bay — Found in large numbers on the sandy beaches. 



Clew Bay— Clare Island, in sand near the Harbour. 

 Distribution. — British Isles ; North Sea ; France ; Mediterranean : eastern 

 Xorth America. 



Nerine foliosa (And. and Edvv.). 



1S96. Nerine foliosa. Mesnil, p. 165. 



This species lives in clean sand, in the lower half of the littoral zone. 



Habitat. — Blacksod Bay — Found on the shore on 6 occasions. Bally- 



xakill Hakbouk— Found once on the shore. 

 I) id rid nl ion. — Great Britain ; Iceland ; Faroe ; Scandinavia ; France. 



Aonides oxycephala (Sars). 



PL XI, fig. 25. 



1896. Aonides oxycephala. Mesnil, p. 242. 



This species is very common and widely distributed throughout the 

 intertidal area. It is usually found in the sand under stones, especially 

 if there is any admixture of mud or decaying weeds. Specimens are 

 occasionally found in Laminaria roots. 

 Mature specimens were found in March. 



Habitat. — BLACKSOD Bay — Found on the shore on 1-1 occasions. Clew 

 Bay — Clare Island shore. Ballyxakill Harbour — Dredged 

 in 1-3 fms. 

 Distribution. — British Isles; Scandinavia; France; ? Port Vendres ; 

 ? United States. 



Aonides paucibranchiata sp. n. 



PI. XI, figs. 24 A-E. 



A large number of specimens were dredged in Clew Bay which, whilst 

 agreeing very closely in many respects with Aonides oxycephala, yet exhibit 

 a certain number of constant and well-marked differences. It will be 

 sufficient in describing this species to point out these differences, without 

 giving a full account of the anatomy. 



The worms are considerably smaller than A. oxycephala. No complete 

 mature specimen was obtained, the largest fragment of a mature male being 

 18 mm. long, consisting of 80 segments. A small entire specimen from 

 Berehaven had 54 segments. The general shape of the body resembles that 

 of A. oxycephala. The head is spindle-shaped (fig. 24 a), rounded at both ends. 

 There are 4 dark kidney-shaped eyes, with lenses. In some specimens the 



