  We use the Parsons Lee modification of Onsagers second virial theory within
the restricted orientation approximation to analyse the phase behaviour of hard
cylindrical rods confined in narrow pores Depending on the wall to wall
separation we predict a number of distinctly different surface generated
nematic phases including a biaxial planar nematic with variable number of
layers a monolayer homeotropic and a hybrid T type structure For narrow pores
we find evidence of two types of second order uniaxial biaxial transitions
depending on the aspect ratio of the particles More specifically we observe a
continuous cross over from n to layers each with a distinct planar anchoring
symmetry as well as first order transitions from planar to homeotropic surface
anchoring Contrary to the previously studied case of parallelepipeds we find
that the surface anchoring transition from planar to homeotropic symmetry
occurs at much lower overall rod packing fractions
