116 THE AMERICAN NATURALIST. [VoL. XXXIV. 
EXPLANATION OF FIGURES. 
(Eigenmann, Figs. 1-5 pas 10-19; Hansell, Figs. 6-9.) 
All the — were made fro the aid of the camera lucida. All but one of 
the figures were made under a NUR either of the Zeiss apochromatic 2 mm., or the Bausch 
and Lomb, — 
(1) P th ; (2) rods and cones; (3) outer nuclear layer; (4) outer reticular layer; 
PN bodisonial cells a inner nuclear layer; (7) i QUT Veil? a inner reticular layer ; 
(9) gan; SE le: (10) optic fibre layer; cz., cone 
Fic. r. porcus, 2mm 
Fic. x cbe an me of Sebastodes gem 
Fic. 3. — Vertical section €— the retina sot Vigite Ion sepals iferus, depigmented with chromic 
acid and stained wi ondi- Ehrlich's 
Fic. 4 2,5, c. — A series a ait T sections pisi do retina, 2 mm. (2) Passes from the 
outer margin of the retina the base of the cone bodies. (2) fuse through the basal 
— of > cones, (o gis through the cone nuclei. 
Perca, fz. 
Fic. 8.— The same in Pimephal. t 
Fic. 9. — same in Mier opterus — ve 
Fic. 10.— Vertical se g 7 tatus, 2 mm 
Fic. 11. — Tangential inet f th i t the depth of the cone bodies, showing th gement 
of the Des 2 mm. ~~ 6mm, 
mee in PL 
Fic. 12. 7 Zi 
Fics. 13-16. — Successive tangential sections through ede retina of a newly hatched ig 
The sections represent the posterior face of successive sections through the same part of th 
ina, 2 mm. 
Fic. 13. — Passes through the outer part of the inner segments of the cones and the inner ends of 
the € e 
Fic. 14. — Passes through the bodies of the cones and shows to best advantage the arrangement of 
the cones. 
Fic. I5. QGercti ro ing the i a ya A 4h. 3. Esh 3.2.9 ging 
to them. 
Fic. 16. TOR midde of met bim — 
ly hatched FOI sf. (?), 2 mm. 
Fic. 1 
Fic. 18. E t of th 
Fic. 19. - Anse ent of the cones and cone cells in Luci icudatus, th the right, 
the cone cells on the left, of the figure, 2 mm. 
H 
