Fusion of Unit Membranes of the Endoplasmic Reticulum in the Gill Epithelial Cell of Shrimp, Caridina

During the course of an investigation of the gill of the shrimp, Caridfna, a specific kind of differentiation of the membranes of the endoplasmic reticulure was observed. It is represented by two apposed, fused cisternae which have bifaciaI, granular, and agranular, profiles. With progress in electron microscopy a number of important observations have been made on the differentiation of the biological membrane, one of which is the close contact or fusion of umt membranes, fiequently observed in various vertebrate tissues (1-7). However, i t seems noteworthy to indicate