304 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 



The anteunse bear no natatory setse on the antepenultimate joint. 

 The terminal claws are non-pectinated and long. They are about as 

 long as the combined lengths of the last three joints. The lower 

 margin of the antepenultimate joint bears a modified sensory seta. 

 The antenna of the male is six-jointed. The mandibular palp of the 

 female is large. The antepenultimate joint bears, in addition to 

 the usual long sensory setce, one short and stout sensory seta which is 

 sub-rectangular in form with truncated ends and convex sides. It is 

 about four times as loog as wide. 



The spines on the first mandibular process of the first maxilla are 

 not toothed. 



The post abdomen of the male (Fig. 36) is slender and sub-triangu- 

 lar. The terminal claws are slender and curved. 



Habitat: Jones' Creek, Kent County, Delaware. The specimens 

 that I have were collected by Mr. L. D. Hileland, March 3, 1894. 



GENUS CYPRIA Zenker. 1854. 



This genus, which was founded by Zenker (238), has been revised 

 by Wenzel Vavra (221). 



Antennules are seven jointed. 



Antennte in the female are five jointed; in the male they are six - 

 jointed. The distal extremity of the fourth joint bears two olfactory 

 setse. The natatory setae on the third joint are very long, extending 

 way beyond the tip of the terminal claws. 



The mandibular palp is much elongated; this is especially true of 

 the terminal joint. 



The palp of the first maxilla is strongly developed. 



The second maxilla bears a well-developed branchial plate. In the 

 female the palp of this member is unjointed and terminates with three 

 setsB. In the male the palp of the second maxilla forms a hooked pre 

 hensile organ. In that case the left palp differs somewhat in size and 

 configuration from the right. 



The small terminal joint of the second foot, which is about one- 

 third as long as the fourth joint, bears two equally long backwardly 

 directed sette. 



The abdominal rami are robust; the caudal seta is situated about 

 midway the caudal border. 



The eye is large. Muscle impressions four. 



Males are numerous. The central cylinder of Zenker's organ is 

 surrounded by seven whorls of chitinous setse. The upper part of the 

 organ forms a blind dilated sac; the lower forms the funnel-shaped 

 origin of f^he vas deferens. The copulative organ is triangular. 



The species of this genus are all small ovate or reniform creatures. 



