Fig. 13. A. latiaaudatus . 

 endopod of second pleopod. 



Variation in morphology of tip of 



A-F, ventral views. From Williams (1970) 



Fig. 14. A. communis. Variation in morphology of tip of endopod 

 of second pleopod. A-M, ventral views; A-K, specimens from eastern 

 States and southeastern Canada; L, specimen from Washington; M, 

 specimen from Colorado, From Williams (1970). 



22 



