ART. 5. NOETH AMERICAN PARASITIC COPEPODS WILSON, 75 



First antennae indistinctljT- jointed; second pair prehensile; second 

 maxillae and maxillipeds similar to those of the female but relatively 

 stronger. First swimming legs single laminae, unarmed; second 

 pair biramose, rami one-jointed; third pair uniramose, one-jointed; 

 fourth pair uniramose cylinders, one- jointed and half as long as the 

 body. 



Type of the genus. — Pseudocycnus a'ppendiculatus Heller, mono- 

 typic. 



Remarks. — The name of this genus is even more unfortunate than 

 that of the preceding one. In his Histoire Naturelle des Crustaces 

 (1840) Milne Edwards described and figured a new genus of para- 

 sitic copepods, to which he gave the name Cycnus. But Hubener 

 had used this name 24 years before for a genus of Lepidoptera, and 

 hence it can not stand for the parasitic copepods. 



P. J. van Beneden ^^ described and figured a copepod parasite 

 which he claimed as a new genus and called Congericola. This 

 has since been proved to be generically identical with Milne Edwards 

 specimens, but specifically distinct. Accordingly the name Cycnus 

 must be dropped and the name Congericola retained. But this 

 leaves us the embarrassing necessity of retaining Cycnus as a valid 

 genus among the moths and Pseudocycnus among the parasitic 

 copepods, the two, of course, not being in the remotest degree 

 related to each other. 



PSEUDOCYCNUS APPENDICULATUS Heller. 



Plate 12, figs. 87-96. 



Pseudocycnus appendiculatus Heller, Reise der Noca)-a, 1865, p. 218, pi. 



22, fig. 7. 

 Pseudocycnus appendiculatus Brian, Copepodi parassiti del Pesci d'ltalia, 



1906, p. 76. 

 Pseudocycnus appendiculatus Brian, Resultats des Campagiies scieutlfiques 



du Prince de Monaco, 1912, fuse. 38, p. 15, pi. 5, fig. 3; pi. 6, fig. 11. 



Host and record of specimens. — Sixteen females and a male were 

 taken August 18, 1886, 100 miles south of Marthas Vineyard from 

 the gills of the albacore, Orcynus alalonga^ by the schooner Grampus. 

 The females have received Cat. No. 12663, U.S.N.M., while the male 

 has been separated and given Cat. No. 54073, U.S.N.M. 



External specific characters of female. — Cephalothorax ovate, nar- 

 rowed anteriorly, with somewhat concave anterior and lateral mar- 

 gins, and covered with a dorsal carapace. The posterior corners of 

 this carapace are prolonged into wide well-rounded lobes above the 

 basal joints of the maxillipeds. Anteriorly the dorsal and ventral sur- 

 faces are fused into a thickened margin which projects a little on either 

 side external to the base of the antenna. The first thorax segment 



83 Bull. Acad. Belgique, vol. 21, 1854, p. 583. 



