ENTOMOSTEACA. 125 



Lepeoptheirus (Nordmann). Feet as in Chalimus ; 

 frontal plates destitute of suckers. 



L. Stromii (On Salmonid(P). 

 pectoralis (Various fishes). 

 Nordmanni (Sunfish). 

 hippoglossi (Holibut). Fig. 208 ; n. s. 

 obscurus (Brill). 

 Thompsoni (Turbot). 



Caligus (Mull.). Feet as in Chalimus; a pair of 

 sucking-disks on the lower surface of the frontal 

 plates. 



C. diaphanus (Various fishes). Fig. 209 ; n. s. 

 rapax (Various fishes). 

 Mulleri (Various fishes). 

 centrodonti (Sea Bream), 

 minutus (Holibut). 

 curtus (Ray). 



Section II. Dactia. 





Gills attached to the feet or to the 

 jaws ; feet ciliated ; eyes usually united 

 into one ; carapace either in the form of 

 an encasing buckler, or of a bivalve shell. Entomostraca. 



The modified legs performing the office 

 of gills ; eyes sessile, immoveable ; tho- 

 racic feet for walking, usually seven pairs ; 

 no carapace Edrioplithalma. 



Gills normal ; eyes stalked and move- 

 able ; feet partly for seizing, partly for 

 walking ; thorax covered by a carapace . Podophthalma. 



Order I. ENTOMOSTRA CA. 



Gills few, attached to the mouth ; cara- 

 pace shield-formed or bivalve ; feet five 

 pairs or fewer ; eye single, antennae two 

 pairs Lophyropoda. 



Gills many, attached to the feet ; cara- 

 pace usually a shield more or less ample, 

 but sometimes wanting Branchiopoda. 



