Plate XVIII. Crustacea. 



{Top left) The copepod Aiwinalocera (male). 



{Top right) Zoea larva of crab. 



{Bottom left) The deep-water copepod BathycaUvuis rigidits. 



{Bottom right) The deep-water decapod Eryoiwiciis piiritniii. 



Upper photographs by D. P. Wilson, 

 lower by Peter David 



