PLATE XV. 



FIGS. 



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

 and 46.) 



1. Nearly median longitudinal section. 



2. Part of transverse section of the intestine. 



3. Horizontal section of the supra-cesophageal gan- 



glion, shewing the crossing of the fibres of the 

 optic nerves. 



4. Transverse section of the eyes. 



5. One of the antennules, shewing the nerve endings. 



6. Transverse section in the region of the supra- and 



sub-cesophageal ganglia. 



7. Transverse section in the region of the- eyes. 



8. Transverse section in the region of the second 



maxillipecls. 



9. The nervous system from the ventral aspect. 



(Figures much enlarged.) 



