SEA-FISHERIES LABORATORY. DAS i 
Ty. typhiosole. V ventral, 
Ven. ventricle. EK external. 
A anterior. 
P posterior. 
D dorsal. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
4. 
I internal. 
R right. 
L left. 
Pram, le 
Cockle with the foot and siphons moderately 
extended, seen from the right side. Nat. size. 
External anatomy; the left valve and part of 
the left mantle lobe have been removed. Nat. 
SIze. 
General anatomy; the right valve and mantle 
lobe have been removed, and the right wall of 
the viscero-pedal mass cut away to expose the 
intestine; the right wall of the pericardium is 
cut away; the right branchie are removed. 
Magnified 25 diameters. The figure is slightly 
diagrammatic; the convolutions of the intes- 
tine are represented as pulled apart, and for 
clearness, as being less in diameter than the 
magnification of the figure warrants. Their 
exact relations are seen in the section repre- 
sented in fig. 11. 
Prats II. 
Section passing through the ureters transver- 
sely to the long axis of the shell, and cutting 
the branchie obliquely. x 38 diam. 
Transverse section through the bases of the 
siphons. xX 4 diam. 
Transverse section through the posterior adduc- 
tor muscle. XX 4 diam. 
