Ko.2194. NORTH AMERICAN PARASITIC C0PEP0D8— WILSON. 103 



The genital segment is not much enlarged (2J diameters), is flat- 

 tened a little laterally, and is perfectly smooth except for the two 

 "wide fleshy processes over the bases of the egg strings. The abdomen 

 is about the same diameter as the coils of the egg strings, is enlarged 

 a little at the tip, and is without knobs or processes. It is bent in a 

 half circle where it leaves the genital segment and is straight for the 

 rest of its length. At the center of the posterior end is a slight sinus 

 which indicates the position of the anus and on either side of this is 

 a rudimentary anal lamina, without setae. 



The two pairs of antennae are on the dorsal surface of the head, 

 in a position corresponding to that in the other genera. The first 

 antennae are short and indistinctly jointed and are turned outward 

 awa^' from the midline; the second antennae are rather large, are 

 two-jointed and chelate. The majority of the rami on the swimming 

 legs are lacking, but the basal joints indicate distinctly the position 

 of the legs ; the first tw^o pairs are close together on the ventral sur- 

 face of the head and just in front of the neck and are biramose; the 

 third and fourth pairs are on the ventral surface of the neck, at 

 distances behind the second pair represented by the numbers 3 and 8; 

 the third pair is biramose and the fourth pair imiramose. From the 

 muscles and a portion of the chitin framework left in the front of the 

 head it is probable that the missing proboscis w'as similar to that in 

 Lernaeenicus. 



Color (preserved material), a brownish yellow, more of a brown 

 on the head and neck, more of a j^ellow on the trunk; egg strings 

 cinnamon-brown. 



Total length, if straightened, 50 mm. Length of head, including 

 posterior horn, 10 mm. ; diameter, 3 mm. Diameter of neck, 1 mm. 

 Length of genital segment, 12 mm.; diameter, 3 mm. Length of 

 abdomen, 7 mm. ; diameter, 1.50 mm. Length of egg coils, 8.50 mm. ; 

 diameter, 1.50 mm. 



{tortuosus, fuU of curves and windings, alluding to the body 

 form.) 



Subfamily Pennellinae. 



Suhfamily characters of female. — Cephalothorax armed with hard 

 chitin horns, two or three in number and unbranched; neck and trunk 

 straight, no sigmoid curvature; genital segment only slightly en- 

 larged and without a pregenital prominence ; abdomen wdth branched, 

 feather-like processes in a row along either side, often running onto 

 the posterior end of the genital segment; anal laminae very rudi- 

 mentarj'' and destitute of setae; egg strings filiform, very long and 

 straight, eggs uniseriate and minute, packed like a row of coins. 

 Two pairs of antennae, the second pair chelate; a tripartite eye 

 deeply buried over the base of the esophagus; proboscis small and 



