74 XORTH AMERICAN PARASITIC COPEPODS WILSON. vol.60 



and he proposed the name Hatschehia for the Dichelesthiid genus. 

 This has been universally adopted, but it leaves us with Clavella^ 

 a recognized Lernaeopod and Pseudoclavella^ just as evidently a 

 Dichelesthiid and not in the slightest degree a " pseudo " of the 

 Lernaeopod. 



Genus PSEUDOCYCNUS Heller. 



Pseudocycnus Heller, Reise der Novara, 1865, p. 218. 



Pseudocycnus Bassett-Smith, Proc. Zool. Soc. London, 1899, p. 475. 



Pseudocycnus Bbian, Copepodi parassiti dei Pesci d'ltalia, 1906, p. 76. 



External generic characters of female. — Head fused with first 

 thorax segment, second and third segments free; fourth and fifth 

 segments fused with the genital segment into a cylindrical body sev- 

 eral times longer than wide, and of about uniform diameter through- 

 out its length. Abdomen one-jointed; anal laminae elongate-lanceo- 

 late, one-third as long as the entire body, very narrow. Egg strings 

 filiform, longer than the body, eggs minute, numerous, and strongljr 

 flattened. 



First antennae short and tapering, with a tuft of setae at the tip ; 

 second antennae prehensile, armed with a stout claw. Mouth tube 

 short and conical. 



First maxillae filiform and setaceous; second maxillae stout and 

 uncinate; maxillipeds large, with a toothed terminal claw. First 

 legs single laminae without rami or setae; second legs biramose, 

 rami one-jointed, setiferous; third and fourth legs uniramose, one- 

 jointed, with terminal setae. 



Internal generic characters of female. — Esophagus entering the 

 stomach on the ventral surface near the anterior end ; intestine nar- 

 rowed through the second and third thorax segments, then widened 

 in the fused posterior body. Ovaries in the posterior portion of 

 the cephalothorax near the dorsal surface; oviduct first narrow, 

 then widened in the genital segm.ent and convoluted along the lateral 

 margins. The convolutions are small but quite regular, especially 

 toward the posterior end. The external opening of the oviduct and 

 hence the %g'g strings are dorsal to the abdomen. The cement glands 

 lie side by side on the median line beneath the intestine. Each is 

 filiform, very narrow, and about the same diameter for its entire 

 length, without segmentation. The semen receptacle lies on the 

 ventral surface of the genital segment beneath the intestine; it is 

 pointed anteriorly and three-lobed posteriorly. 



External generic characters of male. — Head fused with the first 

 thorax segment, the two joined to the second segment by a short 

 neck. Subsequent thorax and genital segments increasing regularly 

 in width ; abdomen abruptly reduced to less than half the width of 

 the genital segment, one-jointed. Anal laminae flattened, much 

 longer than wide, bluntly rounded, and armed with minute spines. 



