368 Illinois State LaJxmitorif of Ndtural History. 



inserted on the posterior part of the body. It is my belief 

 that tcfininalis and loiujiseta are identical. 



As far as known, this is the first time the species has been 

 recorded for the United States. 



Pedetes Gosse. 



Body ovate, tailed ; toes absent ; eyes two, frontal ; two 

 leaping styles articulated to the breast. 



31. P. saltator Gosse. 



One specimen was found in an aquarium started with dried 

 mud from the bottom of Phelps Lake. The species was 

 probably not abundant, since several aquaria had been 

 started before this specimen was discovered. 



Family HYDATINIDiE. 



Hydatina Ehrbg. 



Not loricate ; body conical, tapering towards the foot; foot 

 short and confluent with the trunk ; eye absent. 



32. H. senta Ehbbg. 



This large, fine form was rare. It was seen only in March 

 and July, 1895, in the main river at E. 



Plcesoma Herrick ('85). 



With a lorica composed of two ovate valves united above 

 and partially united below ; foot springing from middle of 

 ventral margin. 



33. P. lynceus Ehrbg. 



Euchlanis bjncpus Ehrbg. 

 Plmsomn Irnticulare Herrick. 

 Gomphogaster areolntus Vorce. 

 Gastropiis ehrenhergli Imhof. 

 Gastroschisa lyncf'vs Bergendal. 

 Gastroschiza fovpolata Jiio-erskiiild. 

 Bipalpns lyncexis Wierzejski and Zacliarias. 

 Pkesomn lynceus Joiiiiiiigs ("fMa. ) 



Not common. Found in all the more permanent waters 

 from May to December, but most frequently from July to 



