atr., atrial orifice 
emb., embryo 
end., endostyle 
f.p., foot-piece 
g., ganglion 
gi., gill 
gon., gonad 
PLATES 
ABBREVIATIONS 
ht., heart 
7.b.v., individual blood vessel 
int., intestine 
oes., oesophagus 
or., oral orifice 
ped., peduncle 
ph., pharynx 
. st.b.v., stolonie blood vessel 
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