COXJUGATIOX IX THE CRAYFISH. CAMBARUS AFFIXIS 253 
Fig. 4 Anterior face of the hook on the same leg. 
Fig. 5 Anterior face of base of left third leg of male 195 mm. long. 
Fig. 6 Section of base of third left leg of young male -48 mm. long. 
Fig. 7 Anterior face of base of third left leg of male of 22 mm. Oct. 4th, 1904, 
shelving no hooks as yet developed. 
Fig. 8 Spur and setae upon base of leg shown in section in fig. 5. 
