474 SMITH: ALGAE FROM THE LAKES OF WISCONSIN 
only in the lack of a pyrenoid and the terminal disc. G. S. West 
and Brunnthaler place the species in the genus Ankistrodesmus. 
Although the shape of the cells shows a great resemblance to that 
of Ankistrodesmus 1 believe that the retention of the genus 
Schroederia is to be preferred. If this species with the fine hair- 
like terminal processes can be shown to reproduce in the same 
manner as Ankistrodesmus, Schroederia should be considered a syn- 
onym; but since, in my observations on over a thousand individ- 
uals, I have never found autospores within the mother cell wall 
(a condition occurring abdundantly in all species of Ankistro- 
desmus), 1 am convinced that this species does not reproduce in the 
same manner as Ankistrodesmus. On the other hand the disc- 
shaped end of one of the apical processes suggests that the species 
may be an epiphytic Characium, possibly like C. limneticus Lemm. 
At first I considered it an epiphytic form that had broken off but 
since the examination of so many individuals has not shown any 
attachment to other plankton, it must be assumed to be naturally 
free-floating and not accidentally detached. 
Schroederia Judayi sp. nov. 
Cells fusiform, straight or curved, ends attenuated into hair- 
like projections, one of which terminates in a disc. Chromato- 
phore single, parietal, with one pyrenoid. 
Length, with spines, 63-45 u, without spines, 30-14 u; breadth 
6-2.5 u; width of terminal disc 4-2 y. 
PLATE 24, FIGS. 9-11 
DIsTRIBUTION: plankton, Birch, Kawaguesaga, Kegonsa and 
Mendota Lakes. 
This species resembles the Egyptian Ankistrodesmus setigerus 
forma minor G. S. West but is somewhat longer, twice as wide, and 
never lacks a pyrenoid. It is named after Mr. Chauncey Juday, 
who first called my attention to it. 
Gloeocystopsis gen. nov. 
Cells elongate, cylindrical, more or less curved, with rounded 
ends. Cells aggregated in fours or eights within a non-lamellated, 
sharply defined, spherical, gelatinous sheath. Colonies of an 
indefinite number of these aggregates arranged in a spherical or 
ovoid mass. Chromatophore diffuse, assimilation product starch. 
