184 Wiscojism Academy of Sciences^ Arts, and Letters. 



Gammarus limnceus. (Smith.)' 



Found in tHe Great Lakes. Dr. P. E. Hoj has found it in a 

 clear spring brook near Racine. 



Gr. fasciatus. (Say.) 



This is doubtless the most abundant of our Crustacea. I have 

 not failed to find it, in greater or less abundance, in every stream 

 or pool that I have examined. It is particularly numerous in 

 small brooklets whose beds are covered with deposits of finely 

 divided vegetable debris. 



Crangonyx gracilis. (Smith.) 



This species has not been found in the interior waters of the 

 state. It occurs in Lake Superior, and Professor Forbes finds it 

 in abundance in central Illinois. 



Asellus intermedius. (Forbes.) 



Abundant in stagnant sloughs and slow running brooks about 

 Sauk City. These Wisconsin specimens differ from the types of 

 Professor Forbes in several unimportant details, especially in the 

 shape of the ramus of the first genital plate, and the size of the 

 second joint of the inner ramus of the second plate. 



Assellopsis tenax. (Hagen.) 



This species I have not seen. It is reported from Lake Superior. 



Eubranchipus hundyi. (Forbes.) Bulletin No. 1, 111. Mus. Nat. 

 Hist, 1876. ' 



This, ourlargest phyllopod, was discovered in small ponds of sur- 

 face water at Jefferson. It was found in abundance in April, but 

 after a few weeks entirely disappeared. Specimens found in two 

 neighboring ponds, while indistinguishable in other respects, dif- 

 fered markedly in size and coloring. In one of these ponds in a 

 densely timbered lot they were small, and pale in color, while in a 

 pond exposed to the sun they were much larger and brilliantly 

 colored. 



Limnetis (sp.?) 



In company with the smaller Eubranchipides above mentioned 

 was found an apparently undescrib.ed species of Limnetis. 

 have met with it in no other locality. 



Dioptomus sanguineus. (Forbes.) 



This beautiful little creature is an abundant inhabitant of the 

 marshy pools and ditches near Sauk City. 



