  We describe new observations of POX 52, a previously known but nearly
forgotten example of a dwarf galaxy with an active nucleus. While POX 52 was
originally thought to be a Seyfert 2 galaxy, the new data reveal an
emission-line spectrum very similar to that of the dwarf Seyfert 1 galaxy NGC
4395, with clear broad components to the permitted line profiles. The host
galaxy appears to be a dwarf elliptical; this is the only known case of a
Seyfert nucleus in a galaxy of this type. Applying scaling relations to
estimate the black hole mass from the broad H-beta linewidth and continuum
luminosity, we find M_BH ~ 1.6x10^5 solar masses. The stellar velocity
dispersion in the host galaxy is 36+/-5 km/s, also suggestive of a black hole
mass of order 10^5 solar masses. Further searches for AGNs in dwarf galaxies
can provide crucial constraints on the demographics of black holes in the mass
range below 10^6 solar masses.
