. A manual of zoology. Zoology. Fig. },-o.—Different degrees of concentration of the ventral cord of .\rthropod3 (from t'.cgenbaur). .i. Termite (.after LespesL B, water beetle (.after Hlanchard). r, Ih- (after Blanchard). D, Ttielyphonid (after Blanchard'). a. abdomen; .!;-, .•;% ganglia of ventral cord; gi. infraeesopliageal ganglion; .;,',(. supraa-sophageal ganglion; 0, eye; p'-p", walking feet; /r, lung books; i, chelicera-; 2, pedipalpus. where the whole veittral chain forms a single ganglionic mass. In all cases, however, the brain remains distiitct from the rest, its position dors
. A manual of zoology. Zoology. Fig. },-o.—Different degrees of concentration of the ventral cord of .\rthropod3 (from t'.cgenbaur). .i. Termite (.after LespesL B, water beetle (.after Hlanchard). r, Ih- (after Blanchard). D, Ttielyphonid (after Blanchard'). a. abdomen; .!;-, .•;% ganglia of ventral cord; gi. infraeesopliageal ganglion; .;,',(. supraa-sophageal ganglion; 0, eye; p'-p", walking feet; /r, lung books; i, chelicera-; 2, pedipalpus. where the whole veittral chain forms a single ganglionic mass. In all cases, however, the brain remains distiitct from the rest, its position dorsal to the oesophagus precluding its fusion with the veittral chain. Two types of eyes are recognized, the simple [ocellus, stcwma) and the compound (facetetl). The ocelli are small. In their Itighest develop- ment, as in spiders (fig. 371), (hey are composed of lens, vitreous body, and retina. The lens is formed by the cuticula, the rest from the epider- mis. The lens differs from the rest of the cuticle in being transparent, ami is usually thickened to a bicoricave body (1) which converges the light upon the retina. Oirly exceptionally (larva^ of Ephemerida) is the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
