Observations are reported for 17 objects that are listed in the Catalogue of Galactic Planetary Nebulae (CGPN). These have either been misclassified as planetary nebulae, have been identified incorrectly by their observers or in the CGPN, or have had peculiar central stars erroneously assigned to them. In about one-half of the cases, we confirm previous reclassifications. The general characteristics of each object are described, and we provide relative emission-line fluxes for two that are already known to be symbiotic stars.
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Lutz et al. (1983) studied this question.
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