.—Limulus, 
ig. 265a. 
from one side. 
Fi 
seen 
Section through a small Limulus polyphemus (much enlarged): liv, liver; pr, proventriculus; st, stomach; ht, heart; cp, cartilaginous 
plate over the nervous system; int, intestine; a, anus; br, brain; m, mouth; o7, @sophageal ring; ng, abdominal ganglia. 
[To face page 298.] 
