126 HISTORY OF BRITISH ZOOPHYTES. 
they are less than an inch in height, but at Leith we got 
them nearly two inches, completely covering the frond of the 
F. serratus. The colour is horny; the cells are opposite ; 
the vesicles scattered and ovate. ‘This species is very phos- 
phorescent when the seaweed to which it adheres is suddenly 
shaken in the dark. 
5. SertuLaria Hvansi, Ir. John Hvans. 
Hab. Yarmouth, where it was found by Mr. Evans, in 
honour of whom it was named by Ellis, to whom it was sent 
in 1767. It does not seem to be much known. 
6. SERTULARIA NIGRA, Pallas. 
Hab. Found at the Lizard, Cornwall, Pallas; in several 
places in Cornwall by R. Q. Couch; Devonshire, Mrs. Grif- 
fiths. 
Robust and erect, from three to seven or eight inches 
high, of a blackish-brown colour when dead, at times tinted 
with red. ‘‘ But to see it in all its beauty,” says Mr. Couch, 
“it must be examined in a living state, and soon after it 1s 
taken from the sea, when, instead of being black, it will be 
found of a beautiful and delicate pink, and in some in- 
stances of a deep arterial blood-colour. It 1s the stoutest 
and most rigid of all our native Sertularia, but there are 
several others which exceed it in beauty and delicacy.” 
