180 TRANSACTIONS OF THE [ Sess. LxXxv. 
described in an “ Anhang zu den Chrysomonadinen ” (see 
vol. i. pp. 12 and 15, vol. ii. pp. 18-19). 
G. S. West in his “ Treatise on the British Freshwater 
Algex.” published in 1904, as previously stated, mentions 
the following seven families as the most important of the 
freshwater Pheophycez :— 
Fam. HypRvuRAcEx, with Hydrurus, Ag. 
CRYPTOMONADINACE®, with Cryptomonas, Ehrenb. 
CHRYSOMONADINACES, with Syncrypta, Ehrenb. ; 
Synura, Ehrenb.; Uroglena, Ehrenb. 
DrnopryaceE®, with Dinobryon, Ehrenb. 
PH £0CAPSACE, with Phwocystis, Lagerh.; Phwococ- 
cus, Borzi: Phweosphera, West and G. S. West; 
Stichoglea, Chodat; Pheschizochlamys, Lemm. : 
Pheodactylon, Bohlin. 
CHORISTOCARPACES, with Plewrocladia, A. Br. 
PHHZOTHAMNIACES, with Phwothamnion, Lagerh. 
Up to 1910 only four of the above families were known 
to be represented in Britain. 
In Thomé’s “ Kryptogamen Flora von Deutschland” (13), 
Migula has apparently followed Oltmanns by regarding 
all the lower Pheophycez as Flagellatz, or rather as inter- 
mediate stages between them and the Alge, as Phzo- 
thamnion, as well as Hydrurus, Pheocystis, andi other Syn- 
getice, are mentioned neither in vol. i, treating of the 
Myxophycez, Chlorophycez, and Bacillaricz, nor in vol. i1., 
devoted to the Phaophycez and Rhodophycee. A copy 
of figs. 7 and 10 of Lagerheim’s plate, published in 1884 
(2), appears, however, on plate 38 of vol. i. in Migula, but 
without any description in the text. 
A bibliography of Phzothamnion, as far as I have been 
able to ascertain, is given below. 
BIBLIOGRAPHY. 
(1) G. S. West.—A Treatise on the British Freshwater Algz, 
Cambridge, 1904, p. 45, and following. 
(2) G. Laceruemma.—U eber Phaothamnion, eine neue Gattung der 
Siiss-wasseralgen. Bihang till K. Svenska Vet. Akad. Hand- 
langar, ix. No. 19, Stockholm, 1884. 
(3) A. Hanserre. —Prodromus der Algenfiora von Bohmen. Vol. im 
Prague, 1886, p. 31. 
