Birge—Notes on Cladocera. 
1037 
tion contains L. australis Sars, L. occidentalis Birge, and L. 
breviremis Daday. These agree in having a shell gland with 
enormously long posterior loop and simple anal spines on the 
post abdomen. The other section contains L. serricauda Sars 
and L. fasciculata Daday, characterized by a serrate crest on 
the postabdomen, anal spines in clusters, and a shell gland 
without large posterior loop. It seems also to be true that the 
antennule in the fasciculata group has a relatively shorter and 
stouter flagellum than that of the australis group. See PI. 
LXVIII, figs. 8, 9. 
4. Wlassicsia Jcinistinensis sp. nov. 
PI. LXIX, figs. 4-8; PI. LXX, figs. 1-9; PI. LXXI, figs. 1, 2. 
Some years ago I received from Dr. C. Dwight Marsh a 
bottle containing a collection made in a marsh at Kinistino, 
Manitoba, Canada, and dated July, 1902. Among other 
Cladocera were found numerous specimens of a new species 
of the genus Wlassicsia Daday. Both males and females 
were present and two females bore ephippia. Among the 
numerous other Cladocera present were D. pulex, 8. vetulus, 
C. reticulata, Macrothrix rosea, Pseudalona latissima, Alonella 
excisa. 
The genus Wlassicsia was founded in 1903 by Daday (’03, 
p. 66) for a Macrothricid which he found in the region of 
Lake Balaton, Hungary, and which he named TP. pannonica. 
The Canadian specimens belong to a closely related but ap¬ 
parently distinct species. 
The general form of the female (PI. LXX, fig. 1), as seen 
from the side is oval, more nearly resembling that of Latho- 
nura than any other member of the family. Like Lathonura 
it has a small crest along the dorsal margin of the valves. 
Where the dorsal and posterior margins join there is a small 
notch, above which there is sometimes a rounded projection, 
hardly to be called a spine. The valves are marked by very 
fine vertical striae, which unite to form delicate meshes. 
These are too fine to show on a drawing unless much more 
4—S. & A.—3 
