Bull. U. S. B. F., 1909. 
Plate XL. 
Left crusher claw of lobster, partly dissected from upper side, to show relations of muscles, nerves, blood vessels, and skin, with 
principal branches of claw arteries and nerves laid bare art, large artery which supplies both muscles of claw, and breaks 
into a regular system of branches in fine meat of tips; n (1), n (2), posterior and anterior nerve trunks supplying, respectively, 
the extensor (Ex 6 ) and thumb, and the flexor (fl 6 ) and index. 
