similar to NGC 1535, as seen in Figure 1. The spectrum of NGC 2022 was taken centered on the ring directly east (E) of the central star. The dominant emission lines are those of atomic hydrogen.

### NGC 2392

The PN NGC 2392 (the “Eskimo nebula”) is another double-shell nebula; however, this PN has a significant amount of structure in the inner ring and outer shell. Spectrophotometric (Barker 1991) and kinematic studies (Reay, Atherton, & Taylor 1983; O’Dell, Weiner, & Chu 1990) that have been carried out with optical imaging and spectroscopy have revealed the abundances and ionization states and velocities of the various components. Near-IR images of this PN were presented in Paper I.

The spectrum of NGC 2392 in Figure 1 was taken centered on the brightest part of the ring directly E of the central star. This third early-type round PN differs from the other two in Figure 1 primarily from the bright line at 2.058 , and the \[\] lines in the J and H bands of the spectrum.

### NGC 3242

NGC 3242 is an early elliptical with several interesting morphological features. In addition to the bright elliptical ring, there are several filaments and knots 