  Let (pi,V) be a generic irreducible representation of a general linear group
over a p-adic field. Jacquet, Piatetski-Shapiro, and Shalika gave an open
compact subgroup K, so that the subspace V^K consisting of v in V fixed by K is
one-dimensional. If pi has a Shalika model Lambda, then we call vectors in
Lambda(V) the Shalika forms of pi, and those in Lambda(V^{K}) the Shalika
newforms. In this article, we give a method to determine all values of the
Shalika newforms on the mirabolic subgroup in the case where pi is
supercuspidal. Using this result, we give another Shalika form with nice
properties, which is not fixed by K in the case where the character defining
the Shalika model is ramified.
