(To face page to. 
SURFACE VIE'WVS. OPTICAL SECTIONS. 
°° astoderine- 
(2) Nerve & 
(2 Meg 2 ; 
(3) Fore-gut 4 
THE DEVELOPMENT OF A WOODLOUSE (Porcedlio scaber), AFYER ROULE. 
Figs. 24, 26, 28, 30, are Surface Views, and figs. 25,-27, 29, 31, which 
indicate slightly later stages respectively than the others, are of egg seen in Optical 
Section. 
