542 Wisconsin Academy of Sciences, Arts, and Letters. 
Genus TOLYPOTHRIX Kiitzing 1843. 
Tolypothrix tenius KUTZING, Phycol. gener. (1843) 
p. 228. Kiitzing, Tabulae Phycol. 2 (1852) p. 9, t. 31, fig. 2. 
Along shore; Plum and Squirrel Lakes. 
Tolypothrix lanata (DESVAUX) WARTMANN, in 
Rabenhorst’s Algen No. 768 (1858). Tilden, Minnesota 
Algae 1 (1910) p. 230, t. 14, fig. 1. 
Along shore; Crystal and Razorbaek Lakes. 
Tolypothrix distorta (HOFMANN-BANG) KUT¬ 
ZING, Phycol. gener. (1843) p. 228. Tilden, Minnesota 
Algae, 1 (1910) p. 231, t. 14, figs. 2-4. Conferva distorta Hof- 
mann-Bang, in Flora Danica 5 (1780) t. 820. 
Along shore; Kegonsa, Marion, Plum and S. Turtle Lakes. 
Family RIVULARIACEAE 
Genus RIVULARIA (Roth) C. A. Agardh emend. 1824. 
Rivularia echinulata (SMITH) BORNET ET FLA- 
HAULT, in Bull. Soc. Bot. France, 31 (1884) p. 77. Con¬ 
ferva echinulata (Rivularia echinulata in index) Smith, in 
English Botany (1804) t. 1378. 
Plankton; Kegonsa, Carroll, Mendota, Oconomowoc, 
Plum, Razorbaek, Soft, Trout and Waubesa Lakes. 
Genus GLOEOTRICHIA J. G. Agardh 1842. 
Gloeotrichia pisum (C. A. AGARDH) THURET, in 
Ann. Sci. Nat. 6 Ser. Bot. 1 (1875) p. 382. Rivularia pisum 
C. A. Agardh, Systema Algarum (1824) p. 25. Tilden, Min¬ 
nesota Algae 1 (1910) p. 284, t. 19, fig. 6. 
Along shore; Marion and Soft Lakes. 
Class CHLOROPHYCEAE 
Order VOLVOCALES 
Family CHLAMXDOMONACEAE 
Genus SPHAERELLA Sommerfelt 1824. 
Sphaerella lacustris (GIROD-CHANTRANS) WIT- 
TROCK, in Hansgirg, Prodr. d. Algenflora v. Bohmen, 1 
(1888) p. 105, fig. 52. Volvox lacustris Girod-Chantrans. Re- 
