PORIFERA OF THE U.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 1s rather surprising that up to now only one tetrac- 
tinellid sponge (Pachymatisma 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: 
Chalina oculata, J. and Suberites 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 
Falichondria coccinea, 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 Papillinu suderea, S., has now 
been left out as it is merely a synonym for Cliona celata, 
Gr. I shall adhere to the classification employed in the 
previous report, but the nomenclature of the species differs 
in a few instances. I now use :— 
Spongelia fragilis, M., instead of Dysidea fragilis. 
Chalina pallida. B., ... ve Chalinula pallida. 
Chalina densa, B., ...... a Chalinula densa. 
Amphilectus incrustans,J., —,, Desmacidon incrustans. 
Esperella egagropila, C., A lsperia egagropila. 
Suberites domuncula, N., Ae. Suberites suberea, M. 
Dercitus bucklandi, B., ba Dercitus niger, C, 
