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EXPLANATION OF PLATE VIII. 
FIGURE 36.—Squilla empusa Say, (p. 5363) lateral view of the free-swimming larvx 
in one of its later stages, enlarged ten diameters. 
37.—Zoéa of the common crab, Cancer irroratus, (p. 530;) in the last stage just 
before it changes to the megalops condition; lateral view, enlarged 
seventeen diameters. 
38.—Megalops stage of the same, just after the change from the zoéa condi- 
tion ; dorsal view, enlarged thirteen diameters. 
(All the figures were drawn by J. H. Emerton.) 
