498 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



PLATK XVIII. 

 Metamorphosis of Alphcus, drawn by W. K. Brooks from sketches by F. H. Herrick. 



Flo. ]. Side view of lirsl or second larval stage of Alphevs lieterochelix from Nassau, drawn ou 



the night of April 15, 1887. Zeiss A. camera. 

 FIG. 2. Ventral view of the third larval stage of Alpheus heterochelis from Nassau, drawn April 



18, 1887. 

 FIG. 3. Ventral view of fourth larval stage of Alphenn Jteterochelis from Nassau, drawn April 



21, 1887. 

 FIG. 4. First maxilliped of the first larval stage of Alpheus minor. 



