552 Wisconsin Academy of Sciences , Arts , and Letters. 
Family COELASTRACEAE 
Genus COELASTRUM Nageli 1849. 
Coelastrum microporum NAGELI, in A. Braun, Alg. 
unicell. (1855) p. 70. Senn, in Bot. Ztg. 57 (1899) p. 53, t. 2, 
figs. 11-17. 
Plankton; Mendota, Mud (Vilas Go.), Oconomowoc, Otter, 
Pope, Squirrel and South Turtle Lakes. 
Coelastrum sphaericum NAGELI, Gatt. einz. Algen, 
(1849) p. 98, t. 5, fig. Cl. 
Along shore; Lake Kegonsa. 
Coelastrum proboscidium BOHLIN, in Bih. t. Kgl. 
Sv. Vet.-Ak. Handl. 23 , Afd. 3, No. 7 (1897) p. 33, t. 2, figs. 
19-22. Senn, in Bot. Ztg. 57 (1899) p. 59, t. 2, figs. 18-22. 
Plankton; Catfish, Clear, Cranberry, Found, Mercer, 
Minocqua and Old Taylor’s Lakes. 
Coelastrum reticulatum (DANGEARD) SENN, in 
Bot. Ztg. 57 (1899) p. 66, t. 2, figs. 1-10. Hariotina reticu¬ 
lata Dangeard, in Le Botaniste, 1 (1889) p. 162, t. 7, figs. 
15-17. 
Plankton; Lake Mendota. 
Genus SORASTRUM Kiitzing 1845. 
Sorastrum spinulosum NAGELI, Gatt. einz. Algen, 
(1849) p. 99, t. 5, fig. D. 
Along shore; Clear, Kegonsa, Plum and Rose Lakes. 
Sorastrum americanum (BOHLIN) SCHMIDLE, in 
Engl. Jahrb. 27, p. 230. Lemmermann, in Arch. f. Hydrobiol. 
u. Planktonkunde, 5 (1910) p. 310, fig. 5. Selenosphaerium 
americanum Bohlin, in Bih. t. Kgl. Sv. Vet.-Ak. Handl. 23 
Afd. 3, No. 7 (1897) p. 40, t. 2, figs. 38-41. 
Along shore; Devil’s Lake. 
Family SCENEDESMACEAE 
Sub-family SCENEDESMEAE 
Genus SCENEDESMUS Meyen 1829. 
Scenedesmus obliquus (TURPIN) KUTZING, in 
Linnaea, 8 (1833) p. 609. Achnanthes obliqua Turpin, in 
Mem. du Mus. d’Hist. Nat. Paris. 16 (1828) p. 312, t. 13, 
fig. 9. 
