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N. See also 6. 



REFERENCE LETTERS. 



a=flagellum in Fig. 27, that is sup- fpyr=axial nerve fiber of a pyramid cell, 



posed to extend centrad beyond frc=axial nerve fiber of the retinal 



the nucleus. cells of the simple eyes. 



b=twin flagella in Fig. 27, of which gc=ganglion cells. 



the centrad continuation is seen ind=impression of the lens probably 



applied against the distal sur- due to the pressure of weight 



face of the cells and to be con- against the surrounding tissue, 



tinued centrad. l=lens. 



c=capsule of lens. lp=long pigment cells. 



cf= axial fibers of cells extending m= muscle fibers. 



centrad. namp=nuclei of ampulla cells. 



co=cornea. nc = network cells (Figs. 13 and 16), 



concr=concretion cavity. and nettle cells (Figs. 28, 29). 



ec=ectoderm. nf=uerve fibers and tissue. 



en=endoderm. nlp=nucleus of long pigment cell. 



f =flagella. nm=nucleus of muscle cells. 



flp=distal fiber of a long pigment cell. nprc=nucleus of prism cell. 



fpr=axial nerve fiber of a prism cell. npyrc=nucleus of pyramid cell 



