326 
FREDA RAGE. 
cone. F.C. Far cone of double cone. N.C. Near cone of double cone. 
O.S.C. Ordinary single cone. S.S.C. Small single cone. St. F. C. Stalk 
of far cone. b.c. Base of cone. hi. p. Protoplasm arranged in blocks. 
h.s. Blind spot. b. v. Blood-vessels, c. c./. Fibril from cone-cell. cli. 
Choroid, chr. Chromatin granules, c. m. Multipolar nerve-cell. c. n. 
Cytoplasm of cone passing over nucleus, c. w. Cell- wall. d. o. s. Discs 
into which outer segment is broken up. ell. Ellipsoid of cone, ell. 1 
Ellipsoid of ordinary single cone, ell.- Ellipsoid of small single cone. 
ell. :i Ellipsoid of near cone of double cone. ell? Ellipsoid of far cone of 
double cone. /. c. Fovea centralis, f. n. Network of fibrils in para- 
boloid. i. s. Inner segment of cone. m. /. Muller's fibre, m. f. b. 
Trumpet-shaped base of Muller's fibre, m. 1. Macula lutea. m. 1. 2. 
Double layer of ganglion cells at the macula lutea. m. 1. e. Membrana 
limitans externa, m. 1. i. Membrana limitans interna, n. b. Nucleus 
of bipolar nerve-cell. n. c. c. Nucleus of columnar cells of pars ciliaris 
retinae, n. d. b. Nucleus of displaced bipolar nerve-cell. n.f. b. Bundle 
of nerve-fibres, n. g. c. Nucleus of ganglion-cell. n. m. Nucleus of 
multipolar nerve-cell. n. on. f. Nucleus of Muller’s fibre, n. p. e. c. 
Nucleus of pigment epithelial cell. oiuc. Nucleus of cone cell, nuc } 
Nucleus of ordinary single cone, nuc.- Nucleus of small single cone. 
nuc. 3 Nucleus of near cone of double cone. nuc. 4 Nucleus of far 
cone of double cone. nucl. Nucleolus, o. g. Oil-globule of cone. o. n. 
Optic nerve, or. s. Ora serrata. o. s. Outer segment of cone. o. s. 1 
Outer segment of ordinary single cone. o. s ? Outer segment of near 
cone of double cone. o. s. 4 Outer segment of far cone of double cone. 
par. Paraboloid of cone, par. 1 Paraboloid of ordinary single cone. 
par.- Paraboloid of small single cone, par? Paraboloid of near 
cone of double cone. p. c. r. Pars ciliaris retinae, p. e. c. Pigment 
epithelial cells, pg. Pigment, p. m. f. Part of Muller’s fibre which 
projects beyond the membrana limitans externa, p. p. Pigment 
processes from pigment epithelial cells, r. c. f. Ramifications of cone 
fibril in outer molecular layer, ret. Retina, scl. Sclerotic, s. o. s. 
Spiral part of outer segment of cone. syn. Syncitial network con- 
necting the bases of the nuclei of the cone-cells, w. p. Wall of para- 
boloid. w. p. t. Thin part of wall of paraboloid in near cone of double 
cone. 
PLATE 27. 
[All the figures are from photographs of preparations of the retina 
of Splienodon pu net at us kindly taken for me by Professor Dendy 
and Mr. R. W. H. Row. 
Fig. 1. — Wall of the eyeball cut through the entrance of the optic 
nerve and the macula lutea. The sclerotic and choroid layers are 
