KO. 2104. NORTH AMERICAN PARASITIC COPEPODS— WILSON. 5 



substitute type, a species which did not agree with his genus diag- 

 nosis and which he had never seen. 



In such a dilemma only one course is possible, and that is to re- 

 store the two genera to their proper places, in spite of the great incon- 

 venience Avliich will result, and this has been done. The author sin- 

 cerely regrets the necessity for such a change, especially when the 

 genera are so widely known and so often quoted, but the evidence is 

 so convincing as to leave no choice in the matter, and both Linnaeus 

 and Blainville have claims for justice which far outweigh any tem- 

 porary embarrassment. 



Location of the Lernaeans. — The early Lernaeans were so eccentric 

 and apparently lacked so many of the usual crustacean appendages 

 that Linnaeus did not suspect them of being Crustacea, and placed 

 them amongst the worms, characterizing them by the softness of their 

 body and the absence of a shell. Hans Strom in the first part of his 

 Physisk og Oeconomisk Beskrivelse (1TG2, p. IGT), under the head- 

 ing of insects, described both sexes of '''' Lernaea salmonis'''' and the 

 females of " L. uncinata.'''' On page 209 he described Lernaea corpore 

 teretl fexnosa^ which Linnaius afterward identified as L. hranehialis 

 and placed with his other species among the worms. 



O. F. Midler, in Zoologiae Danicae Prodromus (1T76, p. 226), 

 gave il species of Lernaea; Fabricius, in Fauna Groenlandica (1780, 

 p. 33G), gave 7 species; Hermann (1783), Schrank (178G), Lamarti- 

 niere (1787), Brugieres (171)2), and Holten (1802) all added species 

 of Lernaea and all adopted Linnaeus's sj'stem of classification. Cu- 

 vier, in his Tableau elementaire (1708, p. 38p), placed the Lernaeans 

 under " JSIollusques gasteropods " in the division of those having 

 free motion in water. Lamarck, in his SystOme des Animaux sans 

 vertebres (1801), also placed them under the mollusks but under 

 "Molkisques ccphales." 



Bosc published an Ilistoire Naturelle des Crustaccs in 1802, but 

 although he gave an excellent historical summary and a good account 

 to date of Caligus^ Arffulus, Cecrops, Dichelestlum^ etc., he included 

 none of the Lernaeans, which was equivalent to saying that he did 

 not consider them as crustaceans. In an Historia Vermium (n. d.) 

 published shortly afterwards he described (p. 51) 15 Lernaean species, 

 placing them among the mollusks, but stating that they approached 

 the intestinal worms. Lamarck, dissatisfied with his first attempt, 

 removed the Lernaeans from the mollusks in his Philosophic Zo- 

 ologie, 1809, and placed them among the annelids. Three years 

 later, in Extrait du Cours de Zoologie and again in Histoire Naturelle 

 des Animaux sans Vertebres (181G), he showed the need of forming a 

 separate class to receive these animals, which he named "" Epizoaires," 

 and which, he said, " may properly fill up the great void which exists 

 between insects and worms." 



