240 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Plate IV. 



Lemma hranchialis. 



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

 f g' shows how much of the anterior portion 

 is buried in the branchial arch. x 4*3. 



Fig. 2. Nauplius stage, newly hatched. x 50*8. 



Fig. 3. Yery young female, unfertilised, dorsal view. 

 From gills of flounder. x 51*5. 



Fig. 4. Fertilised female, dorsal view. Just after 

 leaving the gills of flounder. x 27' 6. 



Fig. 5. Mature male, dorsal view. From gills of 

 flounder. x 28*5. 



Fig. 6. Fertilised female, " Penella " stage, dorsal view. 

 Just after settling on gills of Gadus (whiting). 

 x 15-5. 



Fig. 7. Later stage than Fig. 0, 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 Lerncea. x 18'6. 



F'ig. 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. o. 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 



