. A manual of zoology. Zoology. lis GENERAL PRIXCIPLES OE ZOOLOGY animals stagger and lose their balance. Starting from this assumption, recent investigators have attempted to prove that the audilory vesicles of invertebrated animals are exclusively, or at least largely, organs of equili- bration. This would explain the otoliths, for these bodies, of relatively liigh specific gravity, would affect the crista in different waj's according to the position of the body. Slalolilhs is thus a better name. Stimulation by Light is a phenomenon widely distributed among animals and plants; in its simples
. A manual of zoology. Zoology. lis GENERAL PRIXCIPLES OE ZOOLOGY animals stagger and lose their balance. Starting from this assumption, recent investigators have attempted to prove that the audilory vesicles of invertebrated animals are exclusively, or at least largely, organs of equili- bration. This would explain the otoliths, for these bodies, of relatively liigh specific gravity, would affect the crista in different waj's according to the position of the body. Slalolilhs is thus a better name. Stimulation by Light is a phenomenon widely distributed among animals and plants; in its simplest form it is manifested by the organisms. Fig. 84.âInvertebrate eyes. I, PhylloJocc (an .innelid, after Hesse); II, Xiui- phaiild (annelid, after Greet and Hesse); HI, larva of a beetle, AciliKS, after Grcnaeher; IV, a medusa, Lizzia; c, cuticle; d, gland cells which secrete the vitreous body; c, epidermis; G, vitreous l"'<id\'; L, lens; 0, optic ne^^'e; oc, ocellus; p, pigment; r, rhaf")doms of the retina; .â ;, visual cells. collecting in or shunning the lighted spot (positive and negative pJiololaxis). occurs, even when there are no si)ecial organs for the recog- nition of light (Infusoria, Hydra, many worms). It is increased when there are visual cells, Ihat is light percipient spots connected with nerves. These may be on the surface, or deeper in position, if the overlying layers be translucent (earthworms, Awpliioxiis). If numerous visual cells be united into a layer this is called a rciina. In the lowest developmental. 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
