440 Wisconmi Academy of Sciences^ Arts, and Letters. 



seen Lilljeborg's tji^es, 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. siclloides, but as the agreement in all other details is so 

 close, one cannot help thinJving that th^ 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 suialler, the females being 1.00 mm. and 

 th^ 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 foimd 

 it also in collections from Spirit lake, Iowa. I have foimd 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 ISTebraska. 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 cpace 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; l)ut 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. 



