NO. 2063. NORTH AMERICAN PARASITIC COPBPODS— WILSON. 601 



11. Second antennae biramose, turned down across the frontal margin, ventral ramus 

 unsegmented; first maxillae tripartite; first antennae thi-ee-jointed; male type 

 L, pi. 27 Clavellodes, new genus, p. 689. 



11. Second antennae biramose, projecting forward, ventral ramus unsegmented ; first 



antennae very large, four-jointed, projecting forward and often ai-med with large 

 spines; first maxillae bipartite; male type E, pi. 2Q.Clavellisa, new genus, p. 693. 



12. No posterior processes; no dorsal carapace; both rami of second antennae unseg- 



mented; male type P, pi. 28 Eubrachiella, new genus, p. 716. 



12. Two or four posterior processes; a distinct dorsal carapace; exopod of second 

 antennae two-jointed 13. 



12. Six or eight posterior processes; no genital process; cephalothorax flexed forward, 



not backward I'*- 



13. Cephalothorax separated from the trunk by a distinct groove; fii'st maxillae bipar- 



tite; second maxillae with fingerUke processes or with a club-shaped bulla; 

 male type 0, pi. 28 Parabrachiella, new genus, p. 713. 



13. No groove between the cephalothorax and trunk; first maxillae tripartite; second 



maxillae without process3S or with an ordinary button-shaped bulla; male type 

 C, pi. 25 Brachiella Cuvier, 1830, p. 698. 



14. No dorsal carapace; exopodof second antennae two-jointed; second maxillae sepa- 



rate to their tips; first maxillae bipartite, palp with two spines; male type 



p pl_ 26 Epibrachiella, new genus, p. 715. 



14. A distinct dorsal carapace; both rami of second antennae unsegmented; second 

 maxillae completely fused; first maxillae tripartite, no palp; male type R, 

 p];_ 28 Prohrachiella, new genus, p. 716. 



Synonyms.— Th& mouth parts being difficult to discern while the 

 swimming legs are entirely lacking, the old investigatore were com- 

 pelled to depend largely upon the general form, the external appear- 

 ance, and the egg strings. These features are changeable enough at 

 their best, but when we reflect that practically every specimen 

 described by those investigators had been preserved in strong alcohol 

 we wonder that they located so many of them correctly. The alcohol 

 warps and distorts the soft and unresisting tissues, wrinldes the 

 skin, changes or bleaches out the color, and shrinks the bodies. In 

 view of these facts it is not surprising that the same animal in three 

 or four different kuids of preservation has served as the type of as 

 many distinct species or even genera. In consequence there are very 

 few of the genera which do not have at least one synonym, while some 

 of them have as many as four. The following is a list of the synonyms 

 as at present recognized: 



Pediculus. — Bau-d in his British Entomostraca says: "the first 

 notice taken of any species appertaining to the genus [Lernaeopoda] 

 was by Gisler in 1751, who, in the twelfth volume of the 'Acta Suecica,' 

 describes and figures a species of Lernea found by hun on the salmon, 

 and which he called 'Pediculus salmonis or Lax-lusen'". There is 

 no twelfth volume, 1751, of the Acta Suecica, but m vol. 12, 1751, 

 of Kongl. Svenska Vetenskaps Academiens HandHngar, p. 185, Nils 

 Gissler described J' Lax-lusen," but did not mention Pediculus. Hence 

 the name must be dropped, especially as it was afterwards used by 

 Linnaeus for a genus of Epizoa. 



