THE CRUSTACEANS 



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living crustacean, for the spread of the legs is fully 12 feet. It lives 

 off tlie coast of Japan at depths greater than (iOO feet, and is occa- 

 sionally entangled in the set-lines of the fishermen. 



Our largest spider crabs are Libinia diihia, Fig. 77, and 



p-' 



Fig. 77/ Above: MALE SPIDER CRAB. 

 Left; FEMALE SPIDER CRAB. 

 Right: GHOST ORAB. 

 Center: MUD CRAB. 



Libinia emarginata. They resemble each other closely, and the 

 legs of both spread about eighteen inches, the males being larger, 

 and having longer and stouter legs than the females. Libinia 

 emarginata has more spines on its back than Libinia dubia. Both 

 live from Cape Cod to the Gulf of Mexico, but Libinia emarginata 

 extends north of Cape Cod to the coast of Maine, and lives usually 

 in deeper water than Libinia dubia. Libinia dubia is very 



