The rearward section includes {HEAD ~ an interior chamber} and {TAIL ~ an opening} or channel that extends from the chamber to provide a water flow path between the chamber and the surrounding body of water 
The rearward section includes { HEAD ~ an interior chamber } and { TAIL ~ an opening } or channel that extends from the chamber to provide a water flow path between the chamber and the surrounding body of water
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH