MARTIN ET AL.: MEGALOPAE OF STONE CRABS iMENIPPE) 



Figure 4. — Scanning electron micrographs (SEM) of selected characters of the laboratory-reared megalopa of Menippe merce- 

 naria. A, dorsal view of carapace (x 37); B, ventral view of chelipeds and third maxillipeds (x 55); C, dactylus of second 

 pereiopod showing ventral serrate spines (x 270); D, ventral spines on dactylus of fourth pereiopod with fewer spinules than 

 anterior pereiopod spines (x 2,000); E, dactylus of fifth pereiopod showing four serrate "sensory" setae with one (arrow) more 

 obviously serrate (x 190); F, higher magnification of concave serrate setae indicated by eutow in E (x 1,500). 



295 



