32 ALBERT C. JENSEN. 



PLATE IV. 



Later nauplius stages. 



Figures of plates III. and IV. drawn on the same scale. 

 Notations. 



1. Ocellus. 



2. First antenna. 



3. Compound eye. 



4. Second antenna. 



5. Mandible. 



6. Thoracic appendages. 



7. Gills. 



8. Ovisac. 



9. Intestine. 



10. Basal segment of the first antenna. 



11. Distal segment of the first antenna. 



