PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 483 



ANNOTATED LIST OF THE DESCRIBED SPECIES OF PARASITIC 

 COPEPODA (SIPHONOSTOMA) FROM AMERICAN WATERS CON- 

 TAINED IN THE UNITED STATES NATIONAL MUSEUM. 



By RICHARD RATHBUN. 



The collection of marine invertebrates in the U. S. National Museum 

 contains a large number of species of parasitic Copepoda, which have 

 been mostly obtained from the New England coast during recent years 

 by the U. S. Fish Commission. Of these the writer has identified 

 twenty-six s-pecies (two doubtfully) with species already described by 

 European and American writers, as recorded in the present list. Sev- 

 enteen are identical with p]uropean forms, and it is probable that further 

 studies will increase the number of species common to both sides of the 

 Atlantic. lu many of these determinations he has had the opportunity 

 of making direct comparisons with European specimens received in 

 exchange from the Eev. A. M. ]SIorman and Prof. G. S. Brady, of Eng- 

 land. 



Two species of Argulus [A. laticauda and A. megalops) described by 

 Prof. S. I. Smith, in 1873, from specimens taken at the surface and 

 among algse, have been located on several species of fish, and two At- 

 lantic species {Lepeophtheirus salmonis and Anchorella uncinata) have 

 been traced to the Alaskan region. Three of the species recorded in 

 the list {Argulus alosce {f), Anthosoma crasstim, and Cecrops LatreilUi) 

 were mentioned by Gould in his " Report on the Invertebrata of Mas- 

 sachusetts," 1841; and ten species of the same {Caligus curtus, Caligus 

 rapax, Echthrogaleiis coleoptratus^ Pandarus Cranchii {f), Nogagus Lat- 

 reilUi, Cecrops LatreilUi, Anthosoma crassuni, Lermea hrancliialis, An- 

 chorella uncinata, and Lernceonema radiata) are given by Professor Smith, 

 from personal observation, in the " Report of the U. S. Commissioner of 

 Fish and Fisheries," Part I, for 1871 (1873). In the same report Pro- 

 fessor Smith describes four new species, which are also here included — 

 Argulus laticauda, Argulus latus, Argulus megalops, and Echthrogaleus 

 denticulatus. The following additional species recorded by him, mostly 

 on the authority of others, are not contained in the museum collection, 

 and have not been observed by the writer : Ergasilus labracis (Kroyer), 

 Argulus catostomi (Dana and Herrick), Nogagus tenax (Steenstrup and 

 Liitken), and Pandarus sinuatus (Say). The Pennellce, of which there are 

 many specimens in the museum collection, have not yet been studied. 



The numbers which precede the localities in the list and those in- 

 cluded in parentheses in the notes refer to the Crustacean catalogue of 

 the U. S. National Museum. The number of specimens in each lot is 

 also stated^ being given at the end of each entry. The bibliograi)hical 

 references have been mainly restricted to the authority for the species 

 and to the American publications treating of the same. The classifica- 



