THE EYE OF SALMINCOLA EDWARDSII OLSSON. 413 



EXPLANATION OF PLATES. 



All drawings were made with the aid of the camera lucida. The magnification 

 of each figure is given after its description. 



ABBREVIATIONS. 



b. = brain. 



c. = semi-lunar cups of ocelli. 



ch. = chitinous membrane of larva. 



e. = tripartite eye. 



/. = phaosomes. 



l.o. = lateral ocellus. 



m. = dorsal muscles. 



rn.o. = median ocellus. 



mxp. g. = maxillipedal gland. 



n. = nuclei of retinal cells. 



oe. = oesophagus. 



o.n. = optic nerve. 



p. = pigment of eye. 



r. = basal plates of ocelli. 



w. = body wall. 



