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Outlines of zoology. Zoology. STRUCTURE OF THE LEECH. 217 It has been shown (Whitman) that the eyes of leeches are serially homologous with the segmental sense organs. At the one extreme

Outlines of zoology. Zoology. STRUCTURE OF THE LEECH. 217 It has been shown (Whitman) that the eyes of leeches are serially homologous with the segmental sense organs. At the one extreme

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Download this stock image: . Outlines of zoology. Zoology. STRUCTURE OF THE LEECH. 217 It has been shown (Whitman) that the eyes of leeches are serially homologous with the segmental sense organs. At the one extreme there are purely tactile organs, at the other extreme there are purely visual organs, and between these there are compound sense organs, in part tactile and in part visual,—a series which is full of suggestiveness in regard to the evolution of sense organs (cf of the series sensitive set;e in the crayfish. "The visual organs of the leech are not able to form. Fig. 70. -Transverse section of Leech. A. G. - RE0E7C from Alamy's library of millions of high resolution stock photos, illustrations and vectors.