PORIFEEA OF THE L.M.B.C. DISTRICT. 193 



carefully collected. There is nothing very striking in the 

 distribution. The estuaries of the Mersey and the Dee are 

 by far the poorest in Porifera, as might have been expected. 

 But it is rather surprising that up to now only one tetrac- 

 tinellid sponge {Par h// mat is ma johnstonia, B.) has been re- 

 corded from the Isle of Man. Most probably there are 

 numbers of Tetractinellida living on the rocky shores of 

 that island, and simply requiring to be sought for. The 

 north-east corner of our district has, as far as I know, 

 not yet been specially searched for sponges, so that only 

 two species are recorded from Morecambe Bay. These are : 

 Chaluia ocidata, J. and Suherites domuncula, N. I have not 

 thought it necessary to give in the table a special column 

 to that locality. Puffin Island is only separated from the 

 North Wales column in order that there may be a record 

 of the species found in the immediate neighbourhood of 

 our Biological Station. In all twenty-six species have 

 now been found on the shores of the island. 



The lists in the former reports included the species 

 Halicliondrla cocciuea, B., which had been collected in 

 Belfast Lough. I shall leave it out in the present report, 

 as that species has not yet been found inside the boun- 

 daries of our district. Also Pap'dUna suherea, S., has now 

 been left out as it is merely a synonym for CUona celata, 

 Gr. I shall adhere to the classification employed in the 

 pre^dous report, but the nomenclature of the species differs 

 in a few instances. I now use : — 



Spongelia fragdis, M., instead oi Dysidea fragdis. 



Chalina pallida. B., ... ,, Chalimda j^ciUida. 



Chalina densa, B. , ,, Chalimda densa. 



Amphilectus i/icrusfans, J ., ,, Desmacidon incrustans. 



Esperella cegagropda, C, ,, Esperia cegagropila. 



Suherites domuncula, N., ,, Suherites sid/erea, M. 



Dercitus hucklandi, B., ,, Dercitus niger, C. 



