NAUPLIUS EYE PERSISTING IN SOME DECAPODS, 287 
Fie, 3,—First transverse section through region of median eye in Virbius 
varians showing ingrowth of ectoderm. 
Fic. 4.—Second ditto. 
Fic. 5.—Third ditto. 
Fic. 6.—Fourth ditto. 
Fic. 7.—Fifth ditto. 
Fic. 8.—Highth ditto. 
Fic. 9.—Tenth ditto. 
Fic. 10.—Twelfth ditto. 
Fic. 11.—Sixteenth ditto. 
Fic. 12.—Nineteenth ditto. 
Fic, 13.—Twenty-first ditto. 
Fic. 14,—Diagrammatic horizontal section through brain of Virbius 
varians. 
