440 Wisconsin Academy of Sciences, Arts, and Letters . 
examining material with the lower powers of the microscope 
colonies of fusiform cells with globules on the ends are some¬ 
times found but upon applying a magnification of 1000 
diameters or over, this globule on the end disappears and 
the colony is found to be S. obliquus. Since many workers 
do not use a magnification of over 500 diameters, it is very 
probable that some have fallen into this error. The nearest 
approach to S. antennatus that I have seen is shown in 
Figure 58. In view of the fact that S. antennatus has been 
reported by certain of the more careful investigators, it 
seems very likely that the species exists and should be rec¬ 
ognized. 
GEOGRAPHICAL DISTRIBUTION 
EUROPE. Austria-Hungary (Gutwinski, 1909). England 
(Cooke, 1882; Roy, 1890; W. West, 1889A, 1892B; West and West, 
1897B, 1901B). France (de Brebisson, 1848, 1856; Fournier, 
1903; Comere, 1911). Germany (Nitardy, 1898, 1904; Selk, 1907). 
Ireland (Adams, 1908; W. West, 1892A; West and West, 1902B). 
7. S. incrassatulus Bohlin. (PL XXV: Figs. 9-10.) 
Bohlin, 1897, p. 24; PI. I, Figs. 45-51. Chodat, 1902, p. 211; 
Fig. 131. West and West, 1907, p. 229; PI. XIII, Fig. 26. Brunn- 
thaler, 1913, p. 166; Fig. 3. 
“Sc. vel cellulis singulis vel cellulis in coenobia quaternis 
(nonnumquam binis) conjunctis, aut seriem rectam for- 
mantibus, aut subalternatim dispositis. Cellulis fusiformibus 
subacutis, binis mediis leniter, binis lateralibus magis cur- 
vatis, dorso convexis ventra rectis vel concavis. Membrana 
tenui, in apice incrassatula.” 
Dimens. cell. 17 x 5, 21 x 6, 23 x 5, 28 x 7, 24 x 8 y. 
GEOGRAPHICAL DISTRIBUTION 
Brazil (Bohlin). Burma (West and West). 
var. Mononae nov. var. (PI XXIX: Figs. 81-83.) 
Cellulis ovatioribus, minoribus. Dimens. cell. 11x3.5* 
12x4, 12x4.5 y. 
I have isolated this alga but once, the source of the mate¬ 
rial being near the outlet of Lake Monona, Wisconsin. The 
