Freshwater Algse and Schizopliycese. By A. W. Bennett. 5 
The names of new species or varieties are printed in small capitals ; 
those of species new to the British Islands in italics. An asterisk is 
prefixed to the names of those Desmids which, as far as I am aware, 
have not previously been recorded from the southern counties. 
Diatoms are again excluded. 
PrOTOCOCCACE.®. 
Eremosphaera viridis DBy. 
Urococcus insignis Hass. 
Schizochlamys gelatinosa A. Br. 
Tetraspora gelatinosa Desv. 
Botryococcus Braunii Ivtz. 
Protococcus viridis Ag. 
Ohlorococcum gigas Grun. 
Scenedesmus acutus Mey. 
„ obtusus Mey. 
Trochiseia pachy derma (Reinsch) Hansg. (PI. II. fig. 1.) 
The generic name Acanthococcns proposed by Lagerheim in 1883, 
was replaced by Heinsch in 1888 by Glochiococcus ; but Hansgirg 
has now sunk the genus in Kiitzing’s Trochiseia (Sp., p. 162). Of 
the species described by Reinsch (Ber. Deutsch. Bot. Gesellschaft, 
1886), I have already described T. insignis (Reinsch) Hansg. as 
occurring in Hampshire, as well as a new species T. anglica (Benn.) 
Hansg. in Cumberland. I have now to record the occurrence of 
another species apparently identical with T. pachyderma (Reinsch) 
Hansg. It is much smaller than T. insignis, not more than 20-30 ^ 
in diameter (without the prominences), quite spherical, the thick 
lamellose integument about 1 /4 the diameter of the cell, colourless, and 
elevated into numerous triangular prominences. It was found among 
water- weeds in the Great Pond, Frensham. 
CHROOOOCCACEiE. 
Chroococcus turgidus Nag. 
Aphanocapsa rivularis Rbh. 
Microcystis marginata Kirch. 
„ protogenita Rbh. 
Ccelosphaerium Kiitzingianum Nag. 
Merismopedia glauca Nag. 
Aphanothece prasina A. Br. 
Forming roundish, moderately hard, olive-green masses, resem- 
bling a Nostoc, floating in considerable quantities on the surface of a 
mill-pond at Churt, near Frensham. Cells very minute, elliptical. I 
quite agree with Dr. Cooke in identifying this with Pahnella Moore - 
ana Harv. 
