58 

 Plate IV. 



Lerruea hranchialis. 



Fig. 1. Mature female, from the right side. The line 

 /' g' shows how much of the anterior portion 

 is buried in the branchial arch. x 4'''1 

 Nauplius stage, newly hatched. x 50'8. 

 Very young female, unfertilised, dorsal view. 

 From gills of flounder. x 51'5. 

 Fertilised female, dorsal view. Just after 

 leaving the gills of flounder. x 27'6. 

 Mature male, dorsal view. From gills of 

 floiinder. x 28"5. 

 Fig. 0. Fertilised female, " Penella" stage, dorsal view. 

 Just after settling on gills of Gadns (whiting). 

 X 16-5. 

 Fig. 7. Later stage than Fig. 6, from the left side. 



The folding has just finished. Nat. size. 

 Fig. 8. Apex of gill filament of flounder, showing mal- 

 formation caused by the young Lermeo. x 18'6. 

 Fig. 9. Apex of gill filament of flounder, normal, x 18' 6. 



Plate V. 

 Lerncea hranchialis. 



Fig. 1. Fertilised female, ventral view, showing the 

 appendages, the reproductive organs, and 

 nervous system. x 47"6. 



Fig. 2. Nearly median longitudinal section of the same, 

 x 47-6. 



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

 x 80. 



Fig. 4. Mature female, from the right side, showing 

 the first maxillipede and the four pairs of feet, 

 the alimentary canal and the reproductive 



