498 EDGAR J. ALLEN. 
Figs. 8 and 9.—Beaded nerve-fibres of Astacus. Methylene blue and 
ammonium picrate. x 420. 
Fic. 10,—Three portions of one fibre from commissure of Astacus. Same 
mode of preparation. x 420. 
Fre. 11.—Nerve-ending in commissural ganglion of adult Astacus. Methy- 
lene blue and ammonium picrate. x 420. 
Fie. 12.—(a). Chromatophore of lobster embryo. (b), (¢), (d), (e), (f). 
Endings of branches of chromatophores from lobster embryo, showing end- 
swellings. 
