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-
BioStor
