COPEPODS OF THE WOODS HOLE REGION" 



343 



Distributimi. — Russia (Fischer) ; Sweden (Lilljeborg) ; Germany 

 (Vosseler, Schmeil) ; Poland (Lande) ; Norway (Sars) ; France 

 (Richard) ; Bohemia (Fric) ; Turkestan (Uljanin) ; British Isles 

 (Brady, Scott) ; Hungary (Daday) ; United States (Forbes) ; Min- 

 nesota (Herrick) ; Ohio (Turner) ; Nantucket Island (Forbes). 



Color. — Body rather opaque and light brown, with red oil globules 

 scattered through the metasome ; eye bright red ; eggs violet or purple. 



Femal&. — Metasome elliptical, a little more than half as wide as 

 long; cephalic segment considerably longer than the rest of the 

 metasome; urosome two-fifths as long as metasome; genital segment 

 nearly as long as entire abdomen; caudal rami six times as long as 

 wide, each with a curved row of dorsal spinules. First antennae 8- 

 segmented, densely setose ; 

 fourth segment of second 

 antenna only half as long 

 as third. Anterior por- 

 tion of semen receptacle 

 enlarged, sometimes 

 reaching the a n t e r io r 

 margin of the segment, 

 and transversely ellipti- 

 cal ; posterior portions not 

 divided at center and 

 tapered to a sharp point 

 on either side. Ovisacs 

 oblong oval and closely 

 appressed to the sides of 

 the abdomen; eggs large. 

 Total length, 0.9-1.1 mm. 



Male. — Smaller than the 

 female, the cephalic seg- 

 ment relatively shorter ; urosome 5-segmented and considerably more 

 than half the length of the metasome ; caudal rami the same length 

 and with the same armature as in the female. First antennae 8-seg- 

 mented, once geniculate, the setae on the first and sixth segments 

 peculiarly modified; fourth segment of second antenna relatively 

 longer than in the female ; the five pairs of legs the same, but there is 

 also a rudimentary sixth pair at the posterior corners of the genital 

 segment. Total length, 0.75-0.85 mm. 



Remarks. — This is the only " cyclops " species of the present area 

 whose first antennae are 8-segmented, and in matured females with 

 Qgg, strings may be recognized by this character. It is a bottom form 

 and keeps close to the ground amid the debris. Richard character- 

 ized it as a very poor swimmer, but said that it could move rapidly 

 over a moist surface by means of the dense setae on the first antennae. 



FiGDEE 204. — Paracyclops flmhriatus: a. Female, 

 dorsal (after Sars) ; b, female, fifth leg ; c, caudal 

 ramus 



