368 Illinois Stat,' Laboratory of Natural History. 



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

 that terminalis and longiseta 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 Ehrbg. 



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 lynceus Ehrbg. 

 Plcesoma lenticular 'e Herrick. 

 Gomjihoijastrr areolatus Yorce. 

 Gastropus ehrenbergii Inihof. 

 Gastroschiza lynceus Bergendal. 

 Gastroschiza foveolata Jagerskiold. 

 Bipalpus lynceus Wierzejski and Zach arias. 

 Plcesonvi lynceus Jennings ('94a. 



Not common. Found in all the more permanent waters 

 from May to December, but most frequently from July to 



