276 HISTORY OF BRITISH ZOOPHYTES. 
and either white or of a light purple colour. It is seldom 
more than half an inch in length. 
9, TUBULIPORA HYALINA, £. Q. Couch. 
Hab. On Fucus palmatus, Polperro, Couch. 
‘«‘ ncrusting in small semi-transparent patches of about 
the diameter of a pea. The cells are distant, erect, ar- 
ranged in one or two rows round a plain centre.” 
Genus II]. DIOSTOPORA, Lamourouz. 
Gen. Char. Polypidom calcareous, encrusting, undefined; the 
cells alternating, tubular, horizontal, immersed, with a raised 
circular aperture.—Johnston. 
1. Diasropora OBELIA, Dr. Fleming. 
‘Hab. Scarborough, Mr. Bean; Berwick Bay, Dr. John- 
ston; Cornwall, Mr. Couch; Devonshire, Mrs. Gulson and 
Mr. Peach; Salcombe Bay, very fine on scallop-shells, Rey. 
T. Hincks; Yorkshire coast, Mrs. Gatty; Irish coast, Mr. 
W. Thompson; off Sana Island, Mr. Hyndman; island 
of Tiree, Hebrides, D. L. 
The crust is thin, and adheres so closely to the shell on 
which it grows, that it cannot be removed from it without 
breaking it in pieces. ‘The cells are pretty much immersed ; 
