REPORT ON THE PARASITIC COPEPODA 7 1 



where it joins the head is raised into a ridge, whose ends curve backward. 

 The terminal margin of the hp is uneven and has a large lobe at the center, 

 tipped with two spines. 



The mandibles consist of a shaft tipped with a cutting blade, whose 

 inner margin has a row of curved teeth, the whole appendage being very sim- 

 ilar to those found in the Lernaeopodidae. The maxillae are like those of the 

 male; the maxillipeds have a stout basal joint, a shorter second joint, and a 

 strong terminal claw. 



Behind the mouth on the midline of the ventral surface are two curious 

 processes. The anterior one is shaped like the umbrella portion of a mush- 

 room, is attached by its margin, and stands transversely at right angles to the 

 ventral surface. The posterior one is cylindrical, is attached by one end, and 

 the free tip curves back beneath the neck (see fig. 2). 



On either side of these two processes is a biramose swimming leg, each 

 ramus two-jointed and heavily armed with setae. The other swimming legs 

 have entirely disappeared. The three pairs of cylindrical processes on the 

 sides of the thoracic segments are about the same size and are curved back- 

 ward and downward. 



The genital segment is strongly swollen through the center and is more 

 than twice as wide as long. The abdomen is much narrowed, is twice as long 

 as wide and is indistinctly segmented. The anal laminae are slender and about 

 a third the length of the abdomen, each tipped with a single seta. 



Specific characters of the male. Beside the characters already enume- 

 rated we may note especially the decided cyclopoid appearance of the whole 

 body. The first antennae are five-jointed, the basal joint short and subspher- 

 ical, the second joint nearly half the entire length and quite stout, the three 

 terminal joints short and narrow, and all the joints well armed with setae. The 

 second antennae at first appear biramose, the basal joint being armed with a 

 powerful prehensile claw, which stands ventral to the terminal joints and almost 

 reaches their tip. The upper lip is decidedly emarginate; the mandibles are 

 like those of the female. The first maxilla resembles those of the Ergasilidae, 

 and consists of a rounded papilla-like base tipped with a single non-plumose seta. 

 The second maxilla has a swollen basal joint and a stout, curved terminal claw, 

 the claws of the two maxillae overlapping on the midline. The maxillipeds 

 extend diagonally backward and inward toward the midline; each consists of 

 a stout basal joint, a second joint of about the same width and length, and a 

 rather slender curved terminal claw. The first four pairs of swimming legs 

 are biramose and the rami are two-jointed and heavily armed with setae. The 

 fifth legs are each reduced to a small process, tipped with a single seta. 



Total length of female without egg strings 4 mm. Width 2,50 mm. Length 

 of egg strings 3 mm. Total length of male 1,10 mm. Width 0,40 mm. Color 

 (preserved material) a uniform orange yellow, the male somewhat lighter than 

 the female, neither sex with any pigment markings. 



[cornifera, horned, alluding to the two horns on the dorsal surface of 

 the second thorax segment.) 



