Plate XXI. Fig.317 Caligus thynni,dorsal view of female. Fig.318 Diaptomus hud- 
sonicus,dorsal view of female. Fig.319 Dorsal view of male. Fig.320 Right an- 
tenna of male. Fig.321 Fiftn leg of female. Fig 322 Fifth legs of male. Fig-325 
Fuchaeta media,dorsal view of female. Fig.324 Fifth legs of male. Fig.5c5 Tip 
of left fifth leg. Fig.326 Euchaeta concinna,tip of left rifth leg of male. 
Fig.327 Euchaeta pubera,dorsal view of male. Fig.528 Dorsal view of female uro— 
some. Fig.529 Lateral view of same. Fig.330 Fifth legs of male. Fig.551 Tip of 
lert fifth leg. 
Plate XXII. Fig.540 Gaetanus recticornis,dorsal view of female. Fig.541 Later- 
al view of head. Fig. 543 

