\begin{tikzpicture}[baseline]
     \clip (-1,-2) rectangle (1.2,2);
     \node at (0,0) (S) [ellipse,draw] {$ \hspace{.15 cm} S \hspace{.15cm} $};

     \draw (S.145)--++(0,1);
     \node at (-.1,.5) {...};
     \draw (S.60)--++(0,1);
     \draw (S.35) arc (180:0:.2cm) -- ++(0,-1);
     
     \draw (S.-145)--++(0,-1);
     \node at (-.1,-.5) {...};
     \draw (S.-60)--++(0,-1);
     \draw (S.-35) -- ++(0,-1);
     
     \node at (.1,-1) [rectangle,draw,fill=white] {$\;\; \JW{2n-1} \;\;$};
     \node at (-.1,1) [rectangle,draw,fill=white] {$\JW{2n-3}$};
\end{tikzpicture}