ART. 5. NORTH AMERICAN PARASITIC COPEPODS WILSON. 57 



be confirmed by subsequent examination. If the species is as com- 

 mon as its founder claimed, there is no reason why some one should 

 not give a new and detailed description that would satisfy all 

 queries. 



It is worthy of note that Valle in his list of parasitic copepods 

 found upon fish in the Adriatic Sea^^ mentioned this species of 

 Beneden and enumerated five other fish hosts upon which it is 

 common. One of these was another species of Trygon^ two were 

 skates belonging to Bonaparte's genus Laeviraja, and two were 

 sharks of the genus Mustelus. Specimens from these hosts were 

 deposited in the Civic Museum of Natural History at Trieste. 



Bassett-Smith ^^ made Beneden's Ergasilina a doubtful synonym 

 of Nemesis, and Brian in 1906, Copepodi parassiti dei Pesci d'ltalia 

 (p. 72), followed his example. They also made another of Beneden's 

 " new genera," Pagodina, a synonym of Nemesis. This last synonomy 

 is undoubtedly correct (see p. 60), but if Beneden's figures and text 

 are at all reliable Ergasilina can not possibly be identical with 

 Pagodina and Nemesis and must constitute a new genus. 



Unfortunately the same name, ErgasiliTia, was given by Burmeister 

 in 1833 to the family of parasitic copepods which includes the genera 

 Ergasilus, Bomolochus, and their relatives, and the name has been 

 used in that sense by many subsequent writers. Valle in the paper 

 above quoted even went so far as to call the first family of parasites 

 Ergasilina, including Bomolochus and Ergasilus, and then placed 

 Beneden's genus Ergasilina in an entirely different family, the 

 Dichelestina. Such a confusion of family and generic names is 

 greatly to be regretted, but according to the rules recently adopted in 

 scientific naming both the family and the genus must be allowed 

 to stand. 



Genus CONGERICOLA P. J. van Beneden. 



Not Cycnus Hubener for a genus of Lepidoptera, 1816. 

 Cycnus Milne Edwards, Histoire Naturelle de Crustac^s, 1840, p. 495. 

 Not Cycnns Hesse, Ann. Sci. Nat., ser. 6, vol. 8, 1878, art. 11, p. 2. 

 Congericola Beneden, Bull. Acad, de Belgique, vol. 21, 1854, p. 583. 

 Congericola Norman, Ann. Mag. Nat. Hist., ser. 7, vol. 11, 1903, p. 369. 

 Congericola T. and A. Scott, British Parasitic Copepoda, 1912, p. 124. 



Generic characters of female. — Head fused with first thorax seg- 

 ment to form a small, rounded cephalothorax, separated from the 

 body by a neck composed of two narrow free thorax segments, with- 

 out lobes or plates. Fourth segment wider than the second and third 

 and more or less free. Fifth segment fused with the genital segment 

 to form an elongate, subcylindrical body wider than the head and 

 neck. Abdomen short, one- jointed ; anal laminae cylindrical, setose. 



^^ Boll. Soc. Adrijitica Sci. Nat. Trieste, vol. 6, 1880, p. 67. 

 20 Proc. Zool. Soc. London. 1899. d. 476. 



