REPORT OF THE DIRECTOR, 1922 
NS 
d.m 
SS Rss 
SS 
Wy. 
T-V. DEVELOPMENTAL STAGES. 
Y) 
Co so 
8 KE. USGS 
E 
N 
CATORHRAGMUS BALANUS 
Fig. 1 Diagram of the evolution of Balanus from a phyllocarid 
EOQBALANUS  PROTOBALANUS 
