Abstract
Electron microscopic observations of the ocelli in the marine nematode Deontostoma californicum reveal that it consists of two cells, a pigment cell and a sensory cell. The pigment cell is cup-shaped with a cavity anterolaterally, which bears the sensory cell. The sensory cell is filled with a stack of concentric, convoluted lamellae. Each lamella consists of a pair of membranes and is approximately 240 Å in thickness. The proximal end of the sensory cell narrows to join the lateral cephalic nerve. Thus, the sensory element is considered to be a modified bipolar neuron. Oval to ellipsoidal Schwann cell inclusions, apparently previously undescribed, in the lateral nerve are reported.
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