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Abstract
A neuron of the inner nuclear layer (INL) with some processes extending to the outer plexiform layer (OPL) and others to the inner plexiform layer (IPL) was discovered near the posterior pole of the mouse retina. The neuron's location and appearance are similar to the interplexiform cells of several other species. The relatively recent recognition of this cell type along with its characteristic of infrequent staining by the Golgi technique make the extent of its distribution among species uncertain. With each demonstration in a new species, the existence of the interplexiform cell as a sixth neuronal element of all vertebrate retinas becomes more assured.