PROSOMATIC SEGMENTS OF LIMULUS 245 
SOIT 
LPR 
4: 
Hy | 
sac,vase. 
N 
lee 
SOS OO. FG NS 
Fic. 106.—Dracram oF SacitraL MxEpian SEcTION THROUGH B, EuRYPTERUS ; 
C, Larvat Ammocates; D, FuLL-GROWN AMMOCG@TES, 
