PLATE XLII. 



FIGS. 



18. Lernsea branchialis Linn. (p. 142.) 



1. Mature female, side view, x 4. 



2. Newly hatched iiauplius x 51. (p. 21.) 



3. Very young- female, unfertilized, dorsal view, x 



(p. 21.) 



4. Fertilized female, after leaving- the gills of a flounder, 



dorsal view x 27 i. (p. 21.) 



5. Mature male, dorsal view, x 28i. (p. 21.) 



6. Fertilized female, ' Pemiella stage/ just after attach- 



ment to the gills of a whiting, dorsal view, x 15 i. 

 (p. 23.) 



6a. A later stage than fig. 6; the folding has just been 

 completed; side view, natural size. (p. 23.) 



7. Apex of the gill-ray of a flounder, normal, x 18. 



(p. 22.) 



8. Apex of the gill-ray of a flounder, shewing mal- 



formation caused by the young Lemma, x 18. 

 (p. 22.) 



