260 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
29. Part of a section through the shell, passing 
vertically to the shell surface and perpendicu- 
lar to a line of growth. xX about 25. 
30. A schematic representation of the course of the 
principal blood vessels and channels as seen 
from the right side. 
PraAre Wit 
31. Dissection of a cockle from the ventral side, to 
show the visceral ganglion and nerves. Only 
the portion of the body behind the viscero-pedal 
mass is shown. The fused portion of the inner 
lamelle of the two internal branchie is cut 
through in the middle line, and the septum 
between the siphons and the horizontal shelf 
continuing this forward are cut likewise. X 
about 2 diam. 
32. Dissection to show the right cerebral ganglion 
and surrounding parts. The extremity of the 
anterior adductor has been cut away and the 
muscle separated slightly from the anterior 
wall of the viscero-pedal mass. The right 
labial palps are mostly removed. X 4 diam. 
33. Dissection of the proximal limb of the viscero- 
pedal mass from its anterior margin to show 
the pedal ganglion and nerves. The anterior 
body-wall and the underlying muscles and geni- 
tal gland tubules have been removed. X 3. 
34. The otocyst of the right side in longitudinal 
section. Zeiss apo. 1°5 mm., compens. oc. 4. 
35. Section through an ovarian egg. X about 200 
diam. 
