SmitH: ALGAE FROM THE LAKES OF WISCONSIN 483 
Explanation of plates 24-26 
All the figures were drawn from life with the aid of the Abbé camera lucida, 
the drawings being made at the level of the base of the microscope. The Leitz ob- 
jective 6 was used with the ocular 4, and the objective 1/16 with the oculars 1, 3 
an The magnifications are, respectively, 750, 1,000, 1,650 and 2,000 diameters. 
The drawings have been reduced a little more than one half (to eleven twenty- 
fourths their original size) in reproduction. 
PLATE 24 
. Fic. 1. Chae!osphaeridium mesad G. M. Smith, X345- 
FIG. 3. etrasirum apiculatum (Lemm.) Brunnthaler, X920. 
Fics. 4-6. Characium stipitatum (Bachmann) Wille, 920. 
GC. 7s Kirchneriella elongata G. M. Smith, X920. 
nie 8. Schroederia setigera (Schroder) Reg 920. 
Fics. 9-11. Schroederia Judayi G. M. Smith, X920. 
Fig. 12. Gloeocystopsis limneticus G. M. sable X920. 
PLATE 25 
Fic." 13. Pippen sculptatum G. M. Smith, X46 
Fic. 14, = diastrum araneosum rugulosum (G. S. hes G. M. Smith, 920. 
Fie. 15. onie 8 planctonica G. M. Smith, X920. 
Fic. 16. Elson ciliata minor G. M. Smith, X920. 
Fic. 17. Micractinium quadrisetum (Lemm.) G. M. Smith, X920. 
Fic. 18. Micractinium pusillum Fresenius, X920. 
PLATE 26 
Fics. 19, 20. Tetraedron planctonicum G. M. Smith, X 
Fics. cee 22. Mehodessiae lobatum polyfurcatum G. M. ic X920. 
‘2 tr 
Fic. 24. petaresvte eke stagnale angustum G. M. Smith, 920. 
Fic. 25. Spirulina laxa G. M. Smith, X920. 
=e 26. pais coccus limneticus distans G. M. Smith, X760. 
G. 27. nabaena limnetica G. M. Smith, 760. 
ne 28. senreyene G. M. Smith, 760. 
