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The organs of vision in Insects and Crustacea-Ocelli—Compound
eyes - Cornea - Crystalline cones Retinula — Pigment-
On recognition among ants—Experiments with intoxicated ants
-Evidence against recognition by means of a sign or pass-
LIST OF ILLUSTRATIONS.
1. Diagram to illustrate possible origin of a sense-organ. c, Cuticle;
h, cellular or hypodermic layer 2. Diagram to illustrate possible origin of a sense-organ. C, Cuticle;
h, cellular or hypodermic layer 3. Diagram to illustrate possible origin of a sense-organ. c, Cuticle;
h, hypoderm ; n, nerve 4. Diagram of further stage in the origin of a sense-organ 5. Diagram illustrating a second possible origin of a sense-organ 6. Diagram of further stage in the origin of a sense-organ 7. Section through the simple eye of a young Dytiscus larva. h,
Hypoderm; l, lens; o, optic nerve; 9, P, modified hypodermic
cells; r, retina 8. Auditory vesicle of Ontochis 9. Pacinian corpuscle. a, Neurilemma; b, nerve-fibril; c, capsule;
d, peculiar fibres ; e, central cylinder 10. Papilla from the surface of the hand, X 350. a, Cone-like body;
b, nerve; C, end of nerve 11. Portion of the skin of the back of the hand. The centre figure
represents the arrangement of the hairs; CP, the cold-points;
WP, the warmth-points
Nereis cultrifera. 1, Hypoderm; 2, cuticle ; 3, retina; 4,
the cuticle is unaltered ; g, gelatinous body
Tactile epithelium ; g, ganglionic cell; nr?, upper nerve-ring 14. Diagram of part of the skin of a sea-anemone (Actinia). dz,
Glandular cell; nz, nervous cell 15. Anterior part of body of Bohemilla comata. 1b, Tactile hair;
LIST OF ILLUSTRATIONS.
hy, hypoderm ; C, cuticle; b, anterior part of brain ; a, eye;
13 16. Diagrammatic section through a papilla of touch of Onchidium.
a', a", two layers of the cuticle; a, biconvex thickened portion
14 17. Diagram of the structure of the soft and some of the hard parts
in the tegmentum of a shell of a Chiton (Acanthopleura spiniger),
15 18. Diagram of forms of hairs in insects. a, Ordinary surface hair;
b, plumose natatory hair; c, hair of touch; d, auditory hair;
16 19. Part of the proboscis of a fly (Musca)n, nerve; g, ganglionic swellings; s, tactile hairs or rods ; c, cuticle ..
17 20. Right half of eighth segment of the body of the larva of a guat
(Corethra plumicornis). EG, Ganglion ; N, nerve; %, auditory
18 21. Taste-buds of the rabbit, x 450 ..
20 22. a, Isolated taste-cells from the mouth of a rabbit; b, two covercells and a taste-cell in their natural position, X 600
20 23. Termination of the nerves of taste in the frog, showing the
ramifications of the nerve-fibres and their connections with the
21 24. Inner layer of skin the proboscis of Asterope candida, X 400.
a, Cuticle; b, terminal (nerve) organs; C, ganglionic cells;
d, longitudinal muscle; e, transverse muscle 25. Taste-organ of the bee. B, Horny ridge; R, R, sensory pits;
C, C, skin of the mouth ; L, muscular fibres; A, A, muscular fibres ; S, S', ab c d e f, section of the skin of æsophagus .. 26