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DURING the year 1885 it was my good fortune to enjoy a prolonged stay at the Zoijlogical Station in Naples, that Mecca to which all good disciples of zoijlogy hope to make at least one pilgrimage. My observations there made on the eyes of Molluscs and Arthropods were published in full in the sixth volume of the Mitthez'lungen aus den Zool. Stat. zu Ncapel.. The more important of those observations are described in the following summary, which has been prepared for the Youmal of MorpkoZogy, at the suggestion of Dr. Whitman. I found the r-kina of Molluscs, as well as of Arthropods, to be composed of circles of pigmented cells surrounding central, colorless ones, characterized by constant and remarkable structural features. Believing that these groups of cells constitute PAZTiV. WOL. I. its pointed inner end (ax..). The inner portion of the double cell is filled with refractive and colorless globules. (Figs.

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