THE MARINE ALGAE OF ESSEX.
9
respects the specimens agree fairly well with, typical CI. glaucescens.
This variation from the ordinary form may be accounted for by the
locality where Mr. Hope, gathered his specimens, for he notes that
they were gathered in a "sluice at high-water covered with 8 feet
of salt water, at low water covered with fresh water."
C. fracta, Kutz, "Phyc. Genei.," p. 263. In ditches of
brackish water between Felixstowe Railway-station and the 'River.
Not uncommon; in many places plentiful. June, 1885, E. A. B.
C. albida, Kutz, "Phyc. Germ.," p. 240, f. refracta, Thur., in
Le Jol., "Liste. Alg. Mar. Cherb.," p. 60. Felixstowe, Hope;
between Harwich and Dovercourt, E. M. Holmes.
C. uncialis, Harv., "Phyc. Brit.," pl. 207. Felixstowe and
Harwich, G. Hope. 
Bryopsidaceae, Thur.
BRYOPSIS, Lam.
Bryopsis plumosa, Ag., "Spec. Alg.," i., p. 448. "In a
rock pool near the end of Southend Pier," W. H. Grattann, "British
Marine Algae," p. 21 ; Harwich, Felixstowe, "in pools formed in
cement stone with sandy bottom," G. P. H.
Vaucheriaceae, Damort.
VAUCHERIA, D. C. 
Vaucheria sphaerospora, Nordst., Algol. Smasaker, in "Bot.
Not.," 1879, t. 2. Maldon, "one mile on both sides of the bridge,"
Prof. Otto Nordstedt. [See E. M. Holmes, Essex Naturalist,
vol. i., p. 151.]
 FUCOIDEAE, J. Ag.
Punctariaceae.
PUNCTARIA, Grev.
Punctaria plantaginea, Grev., "Alg. Brit.," p. 53, t. 9.
Harwich, 1876, Varenne. 
Ectocarpaceae.
. ECTOCARPUS, Lyngb.
Ectocarpus erectus, Kutz, "Tab; Phyc.," vol. v. On wood-
work, in company with species of Enteromorpha, Calothrix, and
other small algae. Clacton, Jan., 1893, E. A. B. Rare.