NO. 1404. 



PARASITIC COPEPODS—CALIQID.^— WILSON. 



499 



twoiity in nunibor (tig. C). The l)asos of the ni!indil)les are attached 

 just inside the hitei'al ehitin rods of the lower lip, and are connected 

 w ith the ventral surface of the carapace by stout muscles. There are 

 no traces of mandil)ular palps. 



The first niaxilhe (mx', figs. 4 and 5) are situated near the lateral 

 margin of the carapace, just outside of, and a little posterior to, the 

 bases of the second antenna'. Each consists of a single joint in most 

 of the species, but of two joints in a few species of CaliguH according 

 to the descriptions given. In 

 both sexes they are swollen at 

 the liase and taper toward the 

 tip; in the female they are short 

 and blunt and apparently of no 

 service. 



In the male they are much 

 longer and taper to a slender, 

 sharp point at the apex; each 

 maxilla is also curved over 

 toward its fellow on the oppo- 

 site side and thus forms a claw 

 similar to that on one of the 

 second antenna? (fig 5). And 

 their function would seem to 

 be similar, although we must 

 remember that they are shorter 

 and weaker than both the sec- 

 ond antenna? and the second 

 maxillipeds and so could not 

 reach the host's body until after 

 these others had been buried in 

 the skin. Possibly they may 

 serve in both sexes to irritate 

 the wound and so stimulate the 

 flow of blood. In some species 



of Cul I</i(S and Lepeophthe'lVUS Pig. 4b.— ventral surface and appendages of an 

 , • i. i. i-j. 1 1 adult male Lepeophtheirus edwardsi. (For 



two mmute set* are attached lettering see Fig. 4a.) 

 to the basal part of each max- 

 illa which A. Scott considers to represent the exopodite or palp 

 (eS fig. T). 



The second maxillae (mx", fig. 4) are placed at the sides of the mouth 

 just outside of the suctorial tul)e. Each is made up of a single joint, 

 stout at the base and slender toward the tip. 



In Caligus and closely allied genera the terminal portion is undivided 

 while in LepeopldhelruK and its near relatives it is bifurcated. 



