et al. (in prep) has separated SDSS galaxies into the four (traditional) morphological subsamples of ellipticals, lenticulars (S0’s), early spirals (Sa, Sb galaxies) and late spirals (Sc and Irregulars). This is presented in Figure \[critical\]. Clearly, the mapping between the [[$T_{auto}$]{}]{}parameter and these visually–derived morphological classifications is not perfect, but such an analysis does allow for an easier comparison with previous measurements of the [[$T$–R]{}]{}and Morphology–Density ([[$T$–$\Sigma$]{}]{}) relations, and theoretical predictions of these relationships (see Benson et al. 2000).

The SDSS [[$T$–R]{}]{}relation shown in Figure \[critical\] remains constant at $>2$ virial radii from C4 clusters. As expected, this corresponds to low density regions ($<1\,h_{75}^2\,{\rm Mpc^{-2}}$) in our volume–limited sample. This observation is consistent with previous determinations of the [[$T$–$\Sigma$]{}]{}and [[$T$–R]{}]{}relations in that these functions are near constant at low densities (see Dressler et al 1980; Postman et al. 1984; Dressler et al. 1997; Treu et al. 2003). At a radius of $\simeq1$ virial radius, we witness a change in the [[$T$–R]{}]{}relation, [*i.e.*]{}, we see a decrease in the fraction of late spiral galaxies ($\sim$Sc galaxies) with smaller cluster-centric radii. We also see some indication of a decrease in the early spirals. It is interesting to note that the critical density 