(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.

Fig. 2. The parameters measured to quantify posture. (A) The width of the mantle
was measured along line a, the width of the arms along line b. (B) Schematics
of the cross-sectional view through plane 1 in A (sonogram of collar flaps).
The left hand schematic represents an animal at rest, the right, an animal
during the alternate response. The dorso-ventral height of the anterior mantle
was measured along line c. The area of the anterior mantle cavity (water
space) was stippled area d. (C) Schematics of the cross-sectional view through
plane 2 in A (sonogram of the ventricle). As in B, the left hand schematic
represents an animal at rest, the right, an animal during the alternate
response. The dorso-ventral height of the mid-mantle was measured along line
e. The area of the mid-mantle cavity was stippled area (f). avc, anterior vena
cava; cf, collar flap; fu, funnel; m, mantle; all grey areas represent
viscera; all white areas represent fluid-filled spaces.