Summary: 1. Since the classification of the cone types on morphological features is difficult a) the distance of the cone-inner-segment from the outer limiting membrane b) the position of the cones within the mosaic are used as further criteria. 2. The double cones are either arranged in parallel rows (row-mosaic) or in square units (square mosaic). In both types one or two single cones may be added to the basic pattern. 3. There is an ontogenetic relation between the two mosaic types: Near the Ora serrata, all double cones are placed in parallel rows and only in the more central part of the bulbus of certain species are they arranged in squares. 4. In Bettta and Nannacara 4 rods are enclosed in every square unit; in some other species there are up to 8 rods surrounding the single cones. In most cases rods are more numerous than cones. 5. Probably there is a relationship between the age and diameter of the eye and the regular arrangement resp. the number of the rods. 6. The different morphological types within the three layers of horizontal cells are described. Their occurence and distribution is compared to the findings of other authors (chiefly Cajal). 7. Based on morphological characteristics one cannot determine whether the horizontal cells are neurons or glia elements. 8. The rows of the sclerad horizontal cells run parallel to the rows of single cones without respect to the type of double cone mosaic. 9. There is an equal distance between the nuclei of the single cones and between the nuclei of the outer horizontal cells. 10. The middle and inner horizontal cells are arranged regularly only when they consist of lobed stellar shaped cells. 11. In square and row mosaics the number of horizontal cell layers equals the number of cone types. 12. The relative ratio of double cones to single cones is in good agreement with that of sclerad to intermediary and vitread horizontal cells. In absolute figures there are 2 cones for every horizontal cell. Only the vitread horizontal cells of a few species do not fit this rule. 13. If one compares different square mosaics, one finds a quantitative relation between intermediary horizontal cells and accessory single cones as well as between sclerad horizontal cells and double cones. 14. The correlation between the number of cone types and the number of horizontal cell layers and its functional significance for colour vision is confirmed by the electrophysiological data of Svaetichin. 15. Several functional models of movement perception and lateral inhibition are discussed on the basis of a parallel arrangement of the cone—and the horizontal cell mosaic. Until now there are no experimental data confirming these models.

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   |wiki=    Wicri/Eau
   |area=    EsturgeonV1
   |flux=    Istex
   |étape=   Curation
   |type=    RBID
   |clé=     ISTEX:D98A70A639FC115A757A5A7271158E5FC51438D0
   |texte=   Vergleichende Untersuchungen über das Muster der Sehzellen und Horizontalen in der Teleostier-Retina (Pisces)
}}