No visual organs or means of ingestion can be seen.

Environmental conditions seem to have resulted in the later loss of visual organs in many Eodiscina.

The rays exist, but the visual organ requisite for their translation into light does not exist.

Their teardrop heads were equipped with 4 visual organs evenly spaced around them.

Their most peculiar attribute was the complete lack of any visual organs.

I don't see any sign of visual organs.

Your visual organs will not detect one of them, this time of day.

It has even got this confounded visual organ swivelling about in the most alert and lively fashion.

Neither can I see any visual organs or means of ingestion.

Many later Eodiscina however, lost their visual organs altogether, and this may have resulted from living in an environment with very low visibility.