  A telescopic curve is a certain algebraic curve defined by $m-1$ equations in
the affine space of dimension $m$, which can be a hyperelliptic curve and an
$(n,s)$ curve as a special case. We extend the addition formulae for sigma
functions of $(n,s)$ curves to those of telescopic curves. The expression of
the prime form in terms of the derivative of the sigma function is also given.
