626 Wisconsin Academy of Sciences, A^ds, and Letters. 
Genus EUDOEINA Ehrenberg 1832. 
Eudorina elegans Ehrenberg. 
Abh. d. Kgl. Ak. d. Wiss. zu Berlin Jahrgang 1831: 78. pi. 2, /. 10. 1832. 
II. Camp (cc), Center (sss), Delavan (sss), Elizabeth (rr), Green (rr), 
Paddock (r), Silver (ccc). 
III. Bear (ss), Beaverdam (sss), Birch (ss), Bryer (rr), Chetac (ss). 
Buck (s). Grindstone (rrr). Horseshoe (rr). Island (ss). Lac 
Court Oreilles (rr). Number One (rr), Pokegama (ss). Prairie 
(ss), Eeserve (rr), Eice (ss). Vermilion (rr). 
Order Protococcales 
Family PALMELLACEAE.' 
Genus SPHAEROCYSTIS Chodat 1897. 
Sphaerocystis schroeteri Chodat. 
Bull. Herb. Boiss. 5: 119 pi. 9, -figs. 1-12. 1897. 
II. Browns (rr). Camp (rr). Center (rr), Eagle (rr), Elizabeth (sss). 
Green (rr). Hooker (rr), Mary (ss). Mill (sss), Silver (r). 
III. Bear (ss), Birch (ss), Chetac (ss), Chetek (cc), Lac Court Oreilles 
(rr). Number One (cc), Pokegama (ss). Prairie (ss), Eice (ss). 
Shell (ccc). 
Genus GLOEOCYSTOPSIS G. M. Smith. 
Gloeocystopsis limneticus G. M. Smith. 
Bull. Torr. Bot. Cl. 43: 475. pi. 24, fig. 12. 1916. 
In the few colonies observed the chloroplast was distinctly 
parietal with a single pyrenoid. The original description states 
that the chloroplast is diffuse; so should be amended to describe 
the parietal chloroplast of the younger cells. This same condi¬ 
tion has been observed in Nephrocytium where the chloroplast 
is parietal in young cells, but becomes indistinct as the cell 
grows older. 
III. Beaverdam (rrr). 
Planktosphaeria n. gen. 
Cells spherical, embedded in a copious, non-lamellated, hya¬ 
line, gelatinous sheath; at first solitary, later irregularly dis¬ 
tributed within the colony. Mature cells with several parietal, 
