120 STRUCTURE OF CONCHIFERA OR BIVALVES. 
terminating near one of the canals or siphons, which also — 
carries out the water that has been taken in through the other 
for the purposes of respiration. The figure also shows the 
large fleshy foot, by which this animal can move itself along 
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_.. {Anterior 
\Ganglia 
A> Liver 
Intestine bBo 
[---f- Stomach 
->{-- Nerves 
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-}-—--- Intestine 
ff ----- Ovary 
L---.—- {Posterior 
Ganglion 
Nis rit at ‘(Posterior 
Muscle 
tip, f 
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f Anus 
i i 
Respiratory Tubes. 
Fig. 62.—Anatomy oF Macrra, | 
the ground, or bore into sand or mud. The heart and circu- 
lating system are less complete than in the Gasteropoda ; but 
are far higher in character (as are most of the other parts 
