440 Wisconsin Academy of Sciences, Arts , and Letters. 
seen Lilljeborg’s types, nor have I seen any specimens from 
the locality in which his specimens were obtained. If his 
figure is correct, the form which I have seen would be a variety 
of D. siciloides, but as the agreement in all other details is so 
close, one cannot help thinking that the exact form of this 
appendage was overlooked. The endopodite of the right male 
fifth foot I have found to vary considerably in length, some¬ 
times being nearly as long as the first segment of the exopodite. 
Length of the female, according to Lilljeborg, 1.3 mm. I 
have found considerable variation in the length from different 
localities. My southern specimens measured as follows:—fe¬ 
male, 1.225 mm.; male, 1.1125 mm. The Wisconsin speci¬ 
mens were somewhat smaller, the females being 1.06 mm. and 
tli 3 males 1.01 mm. 
The type specimens were found in Lake Tulare, near Fres¬ 
no, in California. Schacht states that it was the most abun¬ 
dant species in the Illinois river near Havana. He has found 
it also in collections from Spirit lake, Iowa. I have found it 
in material collected by Professor Eigenmann in Turkey lake, 
Indiana, and in collections made by Professor Birge in Hutch¬ 
ins, Texas, and in Creve Coeur lake, St. Louis. Pearse finds 
it in Nebraska. It was present in collections made for me by 
Mr. Shelford in Kansas, and I have recently found it near 
Hugo, Colorado. It seems likely that it will be found in the 
mountain region, thus bridging over the space between Colo¬ 
rado and California. I have found it in one locality in Wis¬ 
consin, in Cedar lake, Washington county, where it seems to be 
the only species. 
The distribution of the species is a matter of a good deal of 
interest. It is found from Indiana on the east to California 
on the west, and from Texas on the south to Wisconsin on the 
north, but nevertheless seems to be a peculiarly localized 
species. Doubtless many other localities will be found, for our 
knowledge of the distribution of Entomostraca is still very 
meager; but some localities have been pretty thoroughly 
studied; we know the Wisconsin fauna quite well, and it seems 
strange that the species should have localized itself to such an 
extent in Cedar lake. 
