Fig. i8i.— Dorsal aspect of swimming crab {Portimus). 

 P., Paddle; A bd., abdomen; .41., antennules ; .42., autennaj ; £., eyes; F., forceps. 



Fig. 182. — Dorsal aspect of shore crab {Carcinus). 

 Abd., Abdomen ; A^., antennules ; A^-., antenna; ; E., eyes ; F., forceps. 



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