654 Wisconsin Academy of Sciences, Arts, and Letters. 
Figs.' 1-2, 
Figs. 3-6. 
Explanation of Plates 10-15. 
Plate 10 
Gonium pectorale Mueller^ x 500. 
Asterococcus Umneticus G. M. Smith (Fig. 4^ x 500; Fgs. 3, 5, 
6, X 1000). 
Fig. 7. 
KircJineriella ohesa var. major (Bernard) G. M. Smithy x 1000. 
Figs. 8--11. PlanMospJiaeria gelatinosa G. M. Smithy x 1000. 
Fig. 1. 
Figs. 2-3. 
Figs. 4-5. 
Plate 11 
AnMstro^esmus lacustris (Chodat) Ostenfeldj x 1000. 
Crucigenia irregularis Wille, x 1000. 
Scenedesmus arcuatus var. capitatus G. M. Smithy x 1000. 
Figs. 6-13. Characium curvatum G. M. Smithy x 1000. 
Figs. 14—18. Characium Umneticum Lemmermann, x 1000, 
Fig. 1. 
Figs. 2-5. 
Fig. 3. 
Fig. 4. 
Plate 12 - 
Crucigenia Lauterhornei Schmidle, x 1000. 
Polyedriopsis spinulosa Schmidle, x 1000. 
Actinastrum Kantzscliii var. elongatum G. M. Smith, x 1000. 
Micractinium pusillum var. elegans G, M, Smith, x 1000. 
Plate 13 
Figs. 1-5. 
Pediastrum simplex var.' duodenarium (Bailey) Eabenhorst, 
X 333. 
Figs. 6-8. 
Fig, 7. 
Sorastrum americanum (Bohlin) Schmidle, x 666. 
Sorastrum americanum var. undulatum G. M. Smith, x 666. 
Fig. 1. 
Figs. 2-4. 
Fig. 5. 
Figs. 6-7. 
Plate 14 
Aphanochaete vermiculoides Wolle, x 400. 
Dactylococcopsis acicularis Lemmermann, x 1000. 
Trichodesmium lacustre Klebahn, x 1000. 
Botryococcus protruherans var. minor G. M. Smith, (Fig. 6 x 
500, Fig. 7 X 1000. 
Figs. 8-9. 
Fig. 10. 
Oocystis eremosphaeria G. M. Smith, x 1000. 
Chlorohotrys limneticus G. M. Smith, x 1000.' 
Figs. 1-2. 
Fig. 3. 
Figs. 4-5. 
Figs. 6-7. 
Plate 15 
Tetraedron verrucosum G. M, Smith, x 1000. 
Tetraedron gracile (Keinsch) Hansgirg, x 1000. 
Tetraedron proteiforme (Turner) Brunnthaler, x 1000. 
Oocystis natans var. major G. M. Smith, (Fig. 6 x 500, fig. 7 x 
1000. 
