SMITH: ALGAE FROM THE LAKES OF WISCONSIN 477 
The genera Peroniella Gobi and Stipitococcus W. & G. S. West 
are quite similar but differ in that the cells of the latter are apicu- 
late or irregularly expanded at the apex and are not ovoid. Since 
the apices of the cells are rounded in the above described alga it 
belongs to the genus Peroniella. It differs from the single known 
species, P. Hyalothecae Gobi, in that the cells are ovoid and smaller. 
A study of the cell contents shows that the genus should be 
classified with the Heterokonteae and not with the Chlorophyceae. 
The chromatophores are without starch or pyrenoids and have a 
decided yellowish green color. Numerous oil droplets, which are 
probably the product of assimilation, are scattered throughout 
the cytoplasm. Few instances of zoospore formation were found, 
but those that were showed no lateral rupture through which the 
zoospores escaped, as Gobi* describes for P. Hyalothecae. Only 
one cilium was observed although a very careful search was made 
for asecond shorter one. In this respect it resembles certain other 
Heterokonteae. 
Chodatella ciliata minor var. nov. 
Cells ovoid, with eight. to six bristles at each end. 
Cells 10-8 p long, 7.56 » wide; bristles about 20 u in length. 
PLATE 25, FIG. 16 
DistTRIBUTION: plankton, Muskallonge Lake. 
The cells of this species are about the same size as those of 
C. subsalsa.Lemm., but the number of terminal bristles is that of 
C. ciliata (Lagerh.) Lemm. The variety minor never reaches the 
minimal limit of the type form. 
MICRACTINIUM PUSILLUM Fresenius 
Micractinium pusillum Fresenius, Abh. Senckenberg. Naturf. Ges. 
2:236. pl. 11, f.46-49. 1858; Lemm. Ber. Deutsch. Bot. Ges. 
22: 21. 1904; Wille in Engler & Prantl, Nat. Pflanzenfam. 
1? (Nachtr.): 57. I9II. 
Archerina Boltoni Lankester, Quart. Jour. Micr. Sci. N: S. a8: 
61. pl. 7, f. 1-23. 1885; 1.c. 52: 423- 1908. 
- Golenkinia botryoides Schmidle, Allg. Bot. Zeitschr. 2: 194. 1896. 
Golenkinia fenestrata Schrider, Ber. Deutsch. Bot. Ges. 15: 492. 
Ol 25, 1. §. 1897. 
* Scripta Bot. Hort. Univ. Petrop. 2: 233-255: Pl. I. 1886-1887. 
