564 Wisconsin Academy of Sciences, Arts, and Letters . 
Genus MISCHOCOCCUS Nhgeli 1849. 
Mischococcus confervicola NAGELI, Gatt. einz. 
Algen. (1849) p. 82, t. 2, fig. D. 
Along shore; Minocqua Lake. 
Family TRIBONEMACEAE 
Genus GHLOROBOTRYS Bohlin 1901. 
Chlorobotrys regularis (W. WEST) BOHLIN, in Bih. 
t. Kgl. Sv. Vet.-Ak. Handl. 27, Afd. 3, No. 4 (1901) p. 34. 
Chlorococcum regulare W. West, in Jour. Roy. Micr. Soc. 
(1892) p. 737, t. 10, fig. 55. 
Plankton; North Turtle Lake. Along shore; Beaver Lake 
Genus OPHIOCYTIUM Nageli 1849. 
Ophiocytium capitatum WOLLE, Freshw. Algae of 
the U. S. (1887) p. 176; t. 158, figs. 3-7. 
Along shore; Minocqua, Plum and Razorback Lakes. 
var. longispina (MOBIUS) LEMMERMANN, in Hed- 
wigia, 38 (1899) p. 32, t. 4, figs. 21-25. Reinschiella longi- 
spinum Mdbius, in Abh. d. Senckenberg. Naturf. Ges. in 
Frankfurt a. M. 18 (1894) p. 331, t. 1, figs. 31-33. 
Plankton; George Lake. 
Ophiocytium cochleare (EICHWALD) A. BRAUN, 
Alg. Unicell. (1855) p. 54. Lemmermann, in Hedwigia, 38 
(1899) p. 30, t. 3, figs. 10-12. Spirodiscus cochlearis Eich- 
wald, in Bull. Soc. Imp. Natur. Moscou, 20, pt. 2 (1848) 
p. 285, t. 8, fig. 4. 
Along shore; Cedar Lake. 
Ophiocytium arbusculum (A. BRAUN) RABEN- 
HORST, Flora Eur. Algarum, 3 (1868) p. 68. Sciadium 
arbuscula A. BRAUN, Algarum unicell. (1855) p. 49, t. 4, 
figs. 1-11. 
Along shore; Rozen Lake. 
Genus TRIBONEMA Derbes et Sober 1856. 
Tribonema bombycina (AGARDH) DERBES ET 
SOLIER, in Suppl. Comptes Rendus de l’Acad. d. Paris 1 
