298 HISTORY OF BRITISH ZOOPHYTES. 
to be inserted in the tube that passes through the middle 
of the whole. The cells, in pairs, are thought by some to 
have the appearance of the small pods of the shepherd’s- 
purse; by others, the shape of the seed-vessels of Veronica, 
or speedwell.” 
Dr. Johnston states that it is very rare, and that he is 
indebted for his much-prized specimens to Mrs. Griffiths. — 
I am rather surprised that it should so long have been 
thought rare, for 1 am persuaded that in the south of 
England it is far from bemg uncommon. ‘The first speci- 
men that I ever met with was on Rytiphlea pinastroides sent 
to me from Brighton by Mr. Pike, and as he had not men- 
tioned that it was on the seaweed, I was delighted on dis- 
covering it. I soon after received it from M. Tumanowicz 
from Hastings, on the same seaweed; and, ere long, I 
found several specimens on Dasya coccinea, from Mr. Hall, 
of Coggeshall, among seaweeds from the Isle of Wight; 
then I received several specimens from Mr. Wigham, which 
he had found on Lytiphlea pinastroides at Hastings, 
and lately he sent me half-a-dozen specimens, saying, that 
he had collected about a score at Cromer. Rytiphlea pi- 
nastroides seems its favourite weed, and it certainly makes 
no great figure among its robust branches; but from the 
