A Shore Crab (Caycinus macnas} parasitized by Sacculina. Natural size. 



(p. 211). 



PL 80. /'226. 



1 cV -2. Larval stages of Sacculina, X35. 



3. Later stage in development of SaccitHna, showing branching of parasite 

 over gut of crab. Natural size. (p. 211). 



