2 LIVERPOOL BIOLOGICAL SOCIETY. 
I could not get a correct: idea of the canal system of 
Setriola compacta. The figure on Pl. VII. shows everything 
I could make out in regard to this point. 
Ecionema ponderosa, Bowerbank. 
Found in the caves on the N.W. side of Puffin Island, 
June, 1888. 
Pachymatisma johnstonia, Bowerbank. 
Found in the caves on the N.W. side of Puffin Island, 
June, 1888. 
Order VI. CALCAREA. 
Ascetta primordialis, Haeckel. 
Collected at low tide at the south end of Puffin Island, 
on 8th September, 1888, by Professor Herdman. 
The species is new to the district, although it is cosmo- 
politan, and has been recorded by Haeckel from nearly 
every part of the world. 
Sycandra ciliata, Haeckel. 
Collected at Isle of Man, August, 1886; common at 
Puffin Island. 
Sycandra compressa. Haeckel. 
Common at Puffin Island. Some very fine specimens 
were found hanging from the ledges of rock at the north 
end, below the Biological Station. 

