\begin{tikzpicture}
	\draw (-1,0)--(2,0);
	\draw (2,0)--++(1,1)--++(1,-1);
	\draw (2,0)--++(1,-1)--++(1,1);
	\draw (3,1)[thick] arc
	[
	start angle=90,
	end angle=180,
	x radius=3.5cm,
	y radius =1cm
	];
	\draw (0.25,0)[thick] arc
	[
	start angle=180,
	end angle=360,
	radius = 0.5cm
	];
	\draw[circle,fill](-0.5,0)circle[radius=1mm];
	\draw[circle,fill](0.25,0)circle[radius=1mm];
	\draw[circle,fill](1.25,0)circle[radius=1mm];
	\draw[circle,fill](2,0)circle[radius=1mm]node[right]{$n-1$};
	\draw[circle,fill](3,1)circle[radius=1mm]node[right]{$n$};
	
	\draw [->,
	line join=round, thick,
	decorate, decoration={
		snake,
		segment length=4,
		amplitude=.9, post=lineto,
		post length=2pt
	}]  (1,-.8) -- (1,-1.7);
	
	\def\y{-2.5};
	\draw (-1,0+\y)--++(3,0);
	\draw (2,0+\y)--++(1,1)--++(1,-1);
	\draw (2,0+\y)--++(1,-1)--++(1,1);
	\draw (1.25,0+\y)[thick] arc
	[
	start angle=0,
	end angle=360,
	radius = 0.5cm
	];
	\draw[circle,fill](-0.5,0+\y)circle[radius=1mm];
	\draw[circle,fill](0.25,0+\y)circle[radius=1mm];
	\draw[circle,fill](1.25,0+\y)circle[radius=1mm];
	\draw[circle,fill](2,0+\y)circle[radius=1mm]node[right]{$n-1$};
	\draw[circle,fill](3,1+\y)circle[radius=1mm]node[right]{$n$};
\end{tikzpicture}