742 Proceedings of the Royal Irish Academy. 



Alteutha interrupta, a fairly common speeies about our coasts, pro- 

 bably often escaped the net. 

 liOngipedia coronata, 

 Ectinosoma spinipes, 

 liaophonte hispida, 

 L. curticauda, 

 Thalestris longimana, 

 T. clausii, 

 T. peltata, 



Harpacticus chelifer, 

 H. fulvus, 

 Porcellidium viride, 

 Idya furcata, 



Are all more or less common in 

 shallow water and tidal pools 

 round our Britisb shores; as 

 their presence here indicates, 

 they are all free-swimmers at 

 times, but mostly of sedentary 

 habits. 



COETC^ID^, 



Coryceeus anglicus was fairly plentiful in the tow-nets on several 

 occasions in the late autumns of 1896 and 1897. It was first 

 recorded by Lubbock from "Weymouth in 1857. Brady and 

 Hobertson found it later in the West of Ireland, and it has 

 been found on our south and west coasts ; its only other re- 

 corded habitat being Heligoland and the North Sea. 



Coryceeus speciosus is, so far as I am aware, new to Britain, although 

 it is quite possible that it may have been mistaken for C. an- 

 glicus, which it strongly resembles. The position of the eyes 

 and the strongly divergent caudal stylets in these specimens 

 seem to clearly indicate its identity with Corycceiis speciosus, 

 Dana. I found several specimens, some with ovisacs in the 

 late autumns of 1895-97, so it appears to have arrived after 

 the end of the summer, and would probably succumb to the 

 first severe cold. 



Oncesa mediterranea was found sparingly by Mr. G. C. Bourne, near 

 Plymouth, in 1889 (Report on the Pelagic Copepoda collected 

 at Plymouth in 1888-89) ; but I am not aware that it has 

 hitherto been reported elsewhere in Great Britain, or indeed 

 north of the Mediterranean. I have found it common about 

 the Canary Islands. Two or thi'ee specimens only occurred in 

 September, 1895. 



The occuiTence of the two southern species Corycceus speciosus 

 and J Oncma mediterranea is specially interesting, as indicating 

 most probably Atlantic diift influence. 



