Plate XIII. 



Figs. 



1-4. Lepeophtheirus pectoralis (0. F. Miiller), ?. (pp. 9-18 

 and 64.) 



1. Ventral view, shewing the various appendages and 



their muscles, x 17. 



2. Dorsal view, shewing the dorsal muscles, x 17. 



3. Ventral view, shewing the alimentary canal and 



digestive glands, x 17. 



4. Ventral view, shewing the nervous system in situ, 



x 17. 



