File:The Cambridge natural history (1895) (20581157700).jpg

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Title: The Cambridge natural history
Identifier: cu31924024535464 (find matches)
Year: 1895 (1890s)
Authors: Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. ed
Subjects: Zoology
Publisher: (London, Macmillan and Co. , Limited; New York, The Macmillan Company
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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B Fig. 103.âA, Sections (diagrammatic) of Crustacean com- pouud eye, A, with pigment in light-position for mosaic vision ; B, "with pigment in darlc-position for refractive vision, c, Corneal lens ; eg, corneagen cells ; cr, crystal- line cone ; /', basal membrane, or membrana I'encstrata ; ip, irido-pigment ; n, nerve ; r, retinula ; rk, rhabdom ; rp, retino-pigment ; v, vitrella. (ip), while the part which surrounds the â retino-pigment" (rp). When the pigment is arranged in this way, as in Fig. A, only those rays of light which strike an ommatidium approxi- mately at right angles to the corneal surface can be perceived, since only these can reach the top of the rhabdom; the others pass through the crystalline cones obliquely, and are absorbed by the cylinder of pigment surrounding each ommatidium, so that they neither reach the rhabdom of the ommatidium which they originally entered, nor can they penetrate to the rhabdom of neighbouring ommatidia. This gives rise to what is known as " mosaic vision," that is to say, each ommatidium only perceives the rays of light which are parallel to its long axis, and in this way an image is built up of which the various points are perceived side by side by means of separate eye- elements. The distinctness and efficiency of this mode of vision depends chiefly upon the number of ommatidia present, and the completeness with which they are isolated from one another by the pigment. Now this form of vision, depending as it does

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