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A compara t ive study of the s tructure and chemistry of the ret inal photoreceptors of the eye is under cont inuous investigation in our laboratory. A par t of this study is focused on the image-forming compound eyes of the arthropods, which include the arachnids, insects, and Crustacea (13-18). T h e present report is a study of the eye s t ructure of Leptodora kindtii, a planktonic crustacean belonging to the order Cladocera which is found in m a n y fresh-water lakes of Nor th America, Europe, and Asia. T h e general morphology and behavior of Leptodora kindtii were described more than a halfcentury ago by Gerschler (5). Leptodora is a relatively large organism (up to 18 m m in length), near ly all t ransparent , wi th one median , spherical eye. Because of its eye structure and various types of neurons (9), as well as its general behavior to l ight stimuli, Leptodora is of interest to us in studies of visual physiology.

THE COMPOUND EYE OF A CRUSTACEAN, LEPTODORA KINDTII