144 LIVERPOOL BIOLOGICAL SOCIETY. 
the cnidophorous sac (¢.s.) with its wall formed of large 
cnidocysts (invaginated ectoderm cells) packed full of enida. 
The sac is rather long, the cnidocysts are very distinct 
and not numerous, and the cnida are of elongated rod-like 
form with the thread coiled transversely to the long axis 
_ of the cell. 
Cratena concinna, Ald. and Hance. 
We obtained this species for the first time during the 
recent cruise of the ‘‘ Hyzna’’ (May, 1890). It was re- 
corded many years ago by Collingwood, from the neigh- 
bourhood of the Mersey. We dredged three specimens off 
Lileiniog in the Menai Straits, between Putin Island and 
Beaumaris, from a depth of six fathoms. 
The colour of the hepatic czeca in the cerata differed a 
little in these specimens, being in one much redder and 
in the others browner. Under a low power of the 
microscope the colour seems very much yellower than it 
does to the eye. It 1s coarsely granular, and in some of 
the cerata the ceeca are much lobed. 
Cratena viridis, Forbes. 
We found one specimen of this rare species amongst 
zoophytes dredged from the Turbot-hole near Puffin Island 
in August, 1889, and took one specimen at Hilbre Island 
on March 21st, 1890. The latter is the first that has been 
recorded from the neighbourhood of the Mersey, and the 
species was only known previously from the other parts of 
our district by one specimen from the Isle of Man and one 
from Puffin Island. We also dredged a specimen in 
Rhoscolyn Bay, Anglesey, during the recent cruise of the 
‘Hyena’ (May, 1890). The following notes were taken 
from the Hilbre Island specimen in the living condition : — 
The length of the body is4°5 mm. The dorsal and oral 
tentacles are rather short and colourless, and have slightly 
irregular edges. There are ten closely placed rows of 
