EXPLANATION OF PLATE VIIL 



Figure 36. — iSquilla empusa Say, (p. 53G;) lateral view of tlie free-swimming larva? 

 in one of its later stages, enlarged ten diameters. 



37. — Zoea of the common cral), 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 zoi'a condi- 

 tion ; dorsal view, enlarged thirteen diameters. 



(All the figures were drawn by J. H. Emerton.) 



