SEA-FISHERIES LABORATORY. 239 



Fig. 11. Transverse section of pore-canal at the base 

 of the mouth, x 350. 



Plate III. 



Lepeophtheirus pectovalis. 



Fig. 1. Female, ventral view, showing the nervous 



system in situ. x 17. 

 Fig. 2. The nervous system from the ventral aspect. 



x 38. 

 Fig. 3. Female, nearly median longitudinal section. 



x IT. 

 Fig. 4. One of the antennules, showing the nerve 



endings. x 76. 

 Fig. 5. Median longitudinal section of the ganglia, 



showing the '"pinhole" oesophagus passing 



through between the supra and sub-nesophageal 



parts. x 77. 

 Fig. ('). Transverse section in the region of the eyes. 



x 38. 

 Fig. 7. Transverse section in the region of the supra- 



and sub-cesophageal ganglia. x 35. 

 Fig. 8. Transverse section in the region of the second 



maxillipedes. x 30. 

 Fig. 9. Transverse section through the genital segment, 



female. x 30. 

 Fig. 10. Transverse section through the genital segment, 



male, x 38. 

 Fig. 11. Part of a transverse section of the intestine. 



x 76. 

 Fig. 12. Horizontal section of the dorsal aspect of the 



supra-oesophageal gangli'on, showing the cross- 

 ing of the fibres of the optic nerves. x 152. 

 Fig. 13. Transverse section of the eyes. x 152. 



