IOWA ACADEMY OF SCIENCE 79 
Coenobium spherical. 
Of eight to thirty-two cells. 
Isogamous 2. Pandorina 
Heterogamous 3. Eudorina 
Of several thousand cells. .... .4. Volvox 
1. Gonium. 
159. G. pectorale Muell. 
Ames. Bessey. 
Ames. Aquarium. Buchanan. 
Ames. Rain water pond. Buchanan. 
2. Pandorina. 
160. P. morum (Muell) Bory. 
Ames. Bessey. 
Ames. Aquarium. Buchanan. 
Ames. Near Ontario in pond. Buchanan. 
3. Eudorina. 
161. E. elegans Ehrenb. 
Fayette. Fink. 
4. Volvox. 
162. V. globator (L.) Ehrenb. 
Iowa City. Hobby. 
Ames. Bessey. 
Ames. Spring. Buchanan. 
Fayette. Fink. 
Eagle Grove. Jenning’s Pond. Buchanan. 
Lower Gar Lake. Buchanan. 
Family III. 
Characieae. 
1. Characium. 
163. C. naegelii A. Br. 
Eagle Grove. Pond near R. R. Buchanan. 
Family IV. 
Pleurococcaceae. 
1. Pleurococcus. 
16k. P. vulgaris Menegh. 
Ames. Bessey. 
Fayette. Fink. 
Grinnell. Fink. 
Ames. Buchanan. 
Eagle Grove. Buchanan. 
Family V. 
Hydrodictyaceae. 
