THE COPEPODA OF LIVERPOOL BAY. 69 
times as long as broad, and each terminated by four seta, 
- In addition to a small seta about the middle of outer edge. 
Several specimens of this strongly marked species were 
sent to me by Mr. Herbert Chadwick of Manchester, 
adherent upon a species of Sabella found on the Beaumaris 
beach, and of which he informs me all the specimens 
he found were similarly infested. Although preserved in 
alcohol the crustaceans tenaciously adhered by their 
hooked antennex to the tentacles of the Sabella, from which 
it required some force to remove them. The females 
were the most plentiful, though several of both sexes 
were on a single worm. The species is easily distinguished 
by its long narrow ovisacs and remarkable antenne; it 1s 
of a greyish brown colour. 
FaMIty ARTOTROGIDA. 
Acontiophorus scutatus, Brady and Robertson. 
One specimen only found on Algz in rock pools at 
Hilbre. 
FAMILY CALIGIDA, 
Trebius caudatus, Kroyer (Pl. IL., fig. 10). 
A few specimens of this parasitic species were found 
in recent night tow-nettings taken off Puffin Island. 
Baird gives a small figure of it in his “Natural History 
of the British Entomostaca”’ (Ray Society, 1849). He 
states that it was found on a skate in Belfast Lough, by 
Mr. Wm. Thompson, in 1837, since which time it does 
not appear to have been recorded. The few specimens I 
have found being all taken at night would seem to indicate 
that it is only then a free swimmer. 
