‘
'
166
_
'
G'. H. PARKER
—
longitudinal muscles and can be best pictured by reference to the
:
_
accompanying diagrams.
These diagrams represent steps in the -
’
passage of a concave wave over the foot of a snail from an anterior
…
:
.
position to a posterior one {left to right in the diagram) whereby
the point a: is temporary released from full adhesion to the mu—
cous surface, moved forward, and brought to full adhesion again.
The point a; is supposed to be associated with a particular longi—
tudinal muscle ber, number 2, through whose action it is moved.
In A, this ber is shown in its relaxedcondition with the wave
approaching
In B, the wave has released the point œ from full
_
|
2
'
3
,
A”—=——+———.————æ—_—‘.
“
.
-
0
’_'—_Ï'—_——-——————l
…
adhesæm In @ ber 2 has eontactedandsmœthe…=posœor
'
*
,over£a«released part of.
overaxedpŒttheosærmr endWlththeundeymgpomtm
has beenmovedanœmyInDthebefremmsœnüæœd
'
166
_
'
G'. H. PARKER
—
longitudinal muscles and can be best pictured by reference to the
:
_
accompanying diagrams.
These diagrams represent steps in the -
’
passage of a concave wave over the foot of a snail from an anterior
…
:
.
position to a posterior one {left to right in the diagram) whereby
the point a: is temporary released from full adhesion to the mu—
cous surface, moved forward, and brought to full adhesion again.
The point a; is supposed to be associated with a particular longi—
tudinal muscle ber, number 2, through whose action it is moved.
In A, this ber is shown in its relaxedcondition with the wave
approaching
In B, the wave has released the point œ from full
_
|
2
'
3
,
A”—=——+———.————æ—_—‘.
“
.
-
0
’_'—_Ï'—_——-——————l
…
adhesæm In @ ber 2 has eontactedandsmœthe…=posœor
'
*
,over£a«released part of.
overaxedpŒttheosærmr endWlththeundeymgpomtm
has beenmovedanœmyInDthebefremmsœnüæœd