Variations in the White Pigment of the Eye in Gammarus cheureuxi Sexton, with a Description of a New Genetic Type, the “Clotted eye.”

Abstract

A Great number of variations from the normal type have occurred in Gammarus chevreuxi during the course of the work carried out from 1912 until now.In reviewing these variations it is convenient to class them according to the parts affected :(1) Pigmentation of the body (3, p. 194).(2) The Red retinal pigment of the eye (4, pp. 45–52).(3) The Black retinal pigment of the eye.(4) The white accessory pigment of the eye (2, p. 350).(5) The structure of the eye, involving also the structure of the head (1, p. 274 ; 6, pp. 356–369).