646 Wisconsin Academy of Sciences, Arts, and Letters. 
Micrasterias radiata Hassall. 
Hist. Brit. Freshw. Algae 386. pi. 90, /. 2. 1845; W. & G. S. West, Monogr. 
of Brit. Desm. 2: 113. pi. 52, figs. 1-9. 1905. 
Micrasterias furcata Ralfs non G. A. Agardh. Kalfs, Brit. Desm. 73. 
pi. 9, /. 2. 1848. 
I. Kawaguesaga (rrr). 
III. Beaverdam (rrr), Horseshoe (rrr). 
Micrasterias Americana (Ehr.) Kalfs. 
Brit. Desm. p. XIX. 1848. 
Micrasterias morsa Ealfs, Brit. Desm. 74. pi. 10, f1 1. 1848. 
I. Found (rr). 
III. Horseshoe (rrr). 
Genus COSMARIUM Corda 1834. 
CosMARiuM CONTRACTUM Kirchuer. 
Algen I, in Cohn, Kryptogamenfl. Schlesien 2: 147. 1878; Wille, Christ¬ 
iana Vid.-Selsk. Forh. 1880: No. 11; p. 33. pi. 1, /, 19. 1880. 
III. Horseshoe (rr). Shell (s). 
var. jACOBSENii (Roy) W. & G. S. West. 
Monogr. of. Brit. Desm. 2: 171. pi. 61, f. 26. 1905. 
I. Mendota (rr). 
COSMARIUM MONiLiFORME var. uMNETicuM W. & G. S. West. 
Monogr. of Brit. Desm. 3: 23. pi. 67, figs. 6-7. 1908. 
III. Lac Court Oreilles (rr). 
COSMARIUM BOTRYTis (Bory de St. ineent) Menegh. 
Linnaea 14: 220. 1840; Ealfs, Brit. Desm. 99. pi. 16, f. 1. 1848. 
III. Number One (rrr). 
COSMARIUM PROTRACTUM (Nageli) dc Bary. 
Unters. u. d. Fam. d. Conj. 72. 1858. 
Euastrum protractum Nageli, Gatt. einz. Algen 119. pi. 7, fig. A^ 1849. 
I. Okauchee (rrr). 
