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‘ _ ‘ : cM < hs * oe vy 
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~~; 
304 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
The antennez bear no natatory sete 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 sete, one short and stout sensory seta which is 
sub-rectangular in form with truncated ends and convex sides. It is 
about four times as long 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 VAavra (221). 
Antennules are seven-jointed. = 
Antenne in the female are five-jointed; in the male they are six- 
jointed. The distal extremity of the fourth joint bears two olfactory 
sete. The natatory sete 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 
sete. 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 setz. 
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 sete. The upper part of the 
organ forms a blind dilated sac; the lower forms the funnel-shaped 
origin of the vas deferens. The copulative organ is triangular. 
The species of this genus are all small ovate or reniform creatures. 
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