FIG 8 also shows {HEAD ~ the spherical indented shape} of {TAIL ~ the two outside walls} 216 which are formed by a subsequently applied covering 
of
FIG 8 also shows { HEAD ~ the spherical indented shape } of { TAIL ~ the two outside walls } 216 which are formed by a subsequently applied covering
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH