Bull. U. S. B. F., igog. 
Plate XXXVIII. 
X 
Figs. 1-4. — Left second to fifth pereiopods or slender legs of adult lobster from anterior side, showing numbered segments of per- 
manent limb, distribution of sensory tufts (.? ^), gills {pb, in fig. 1-3), and gill separators (ep), arrangement of ball-and-socket 
basal hinges, median ball ( h , b ), and peripheral socket (h, s), tendons of basal joints {t.fi. 1, and t. ex. /), and cleaning pick 
and brush {cl. br) of last leg. Star in figure 4 marks position of exopodite or outer swimming branch of thoracic limb, shed at 
fourth stage. 
