144 LIVERPOOL BIOLOGICAL SOCIETY. 



the cnidophorous sac (c.s.) with its wall formed of large 

 cnidocysts (invaginated ectoderm cells) packed full of cnida. 

 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, Aid. and Hanc. 



We obtained this species for the first time during the 

 recent cruise of the " Hyaena" (May, 1890). It was re- 

 corded many years ago by CoUingwood, from the neigh- 

 bourhood of the Mersey. We dredged three specimens off 

 Lleiniog in the Menai Straits, between Puffin Island and 

 Beaumaris, from a depth of six fathoms. 



The colour of the hepatic caeca 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 is coarsely granular, and in some of 

 the cerata the caeca 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 Merse}^ 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 

 Khoscolyn Bay, Anglesey, during the recent cruise of the 

 "Hyaena" (May, 1890). The following notes were taken 

 from the Hilbre Island specimen in the living condition : — 



The length of the body is 4*5 mm. The dorsal and oral 

 tentacles are rather short and colourless, and have slightly 

 irregular edges. There are ten closely place! rows of 



