4i8 



PHYLUM ARTHROPODA 



The most anterior pair are much used as feelers. The spinnerets at 



Fig. 231. — Sex dimorphism in a spider {Nephila nigra). — After Vinson. 



F., The female ; M., the minute male. 



the end of the abdomen are modified abdominal legs. Besides these 

 the embryo has four pairs of abdominal appendages which abort. 



