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

 of the mouth. x ."350. 



Plate III. 



Le jieophtheiriis pectoral is. 



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

 system ifi situ. x 17. 



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

 X ;j8. 



Fig. •'{. Female, nearly median longitiidinal 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 "" (jesophagus passing- 

 through between the supra and sub-cesophageal 

 parts. X 77. 



Fig. (i. Transverse section in the region of the eyes. 

 X 38. 



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

 and sub-(esophageal 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-cesophageal ganglion, showing the cross- 

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



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



