NO. 1573. PARASITIC COPEPODS- WILSON. 357 



vulva papilla, in the angle between it and the ventral surface of the 

 genital segment on either side, and their duct empties on the same 

 side without crossing the mid-line, as in Pandarus. 



Semen receptacle globular, a little wider than long and just in 

 front of the base of the abdomen; its anterior margin is evenly 

 rounded, its posterior one is split at the center, dividing the receptacle 

 into two conical, widely divergent branches, which run out into the 

 vulva papilla on either side and there open into the oviduct. Cement 

 glands almost invisible in preserved material, the only tiling that 

 could be made out with reference to them being their position on 

 either side of and close to the mid-line, and their general shape that of 

 parentheses marks. 



External egg-sacs slender, one and a half to two times as long as 

 the entire body; eggs small, strongly flattened and numerous, with 

 very little pigment. 



Total length 4 mm. Length of carapace 1.5 mm. Width 1.9 mm. 

 Length of genital segment L6 mm. Width of same l.S mm. Length 

 of egg-strings 6 to 8 mm. 



Color a light yellowish white, without pigment, often turning 

 brown in alcohol. 



{coiriTnunis, common). 



Male. — No adult male has everT^een obtained, not merely for this 

 species, but for the whole genus. Two fidly developed chalimus 

 males, however, were obtained in company with chalimus females 

 and young adults on a smooth dog-fish captured September 2, 1904, 

 at Woods Hole. The following is a description of these males and 

 would be correct for the adults except in size. 



Carapace, including the posterior lobes, forming an ellipse, strongly 

 narrowed anteriorly, its lateral margins moderately convex. Pos- 

 terior lobes long and narrow and ]:)luntly rounded at the tip ; pos- 

 terior margin between the lobes nearly straight, with the rudiments 

 of accessory lobes on either side. Eyes large and prominent, a little 

 in front of the center and close together, but not in actual contact. 

 Frontal lobes large and prominent, narrow at the center but broad 

 at the outer ends, where they cover most of the basal joints of the first 

 antennae. Free thorax segments diminishing regularly in width 

 backward, the fourth one the same width as the genital segment, the 

 first one considerably narrower than the distance between the pos- 

 terior lobes of the carapace, leaving a wide open space on either side. 

 Lateral processes of this first segment long, large, and curved outward 

 at the tips. 



Genital segment oblong, the anterior margin nearly straiglit, the 

 lateral margins evenly rounded, the posterior margin concave. 



The fifth legs appear as large and prominent papillae at the postero- 

 lateral corners, about one-fifth of the distance in front of the posterior 



