. L'amphioxus et les ancêtres des vertébrés [microform]. Les vertébrés ; Français ; poissons ; Ascidiacea ; Vertébrés ; Cordés ; poissons ; Ascidiacés.^iimfH qii| i ( i*"^ 132 DI-.n-./.O/'MJ.XJ- d'AMJ'J//i&gt ;.(S. du pharynx, bien que les fentes plus postérieure du pharynx sous virage, alors que la plupart ont une médiane postérieure position ventrale. En face la f;mauvais slits toujours ouverte directement à l'extérieur, mais le rij^metapleural m'ht est perçu comme hanginj^, au-dessus d'eux ; alors que les fentes empêchent maintenant ouvert dans l'atrium partiellement formés, qui a fermé en alreatly r â I'' '. !" "9. Fig. 74.

• Contributeur: Library Book Collection / Alamy Banque D'Images
• ID de l’image: RJ26KA
• Taille du fichier: 7,1 MB (324,8 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 2901 x 861 px | 24,6 x 7,3 cm | 9,7 x 2,9 inches | 300dpi

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. Amphioxus and the ancestry of the vertebrates [microform]. Vertebrates; Chordata; Fishes; Ascidiacea; Vertébrés; Cordés; Poissons; Ascidiacés. qii| i^iimfH ( i*'^ 132 DI-.n-./.O/'MJ.XJ- Of AMJ'J//i>.(S. pharynx, although the more posterior slits bend under the pharynx, while the most posterior have a median ventral position. In front the f;ill-slits still open directly to the exterior, but the rij^ht metapleural told is seen to be hanginj, ^ over the tops of them ; while the hinder slits now open into the partially formed atrium, which has alreatly closed in r â I'' '.!' '9. Fig. 74. â Anterior portion of l;irva, with fourteen primary gill-slits and rudl- ments of the secondary gill-slits; viewed as a transparent object from the right side. (After WlLI.KV.) .f.d. Sense-organ of (invoral pit (groove of Hatschtjk). e. Kndostyle. ffl. In- ternal o]5ening of chib-sha|)e(l glantl. s..s. Rudiments of secondary gill-slits. ;*.i'', /.('^. Thirteenth and fourteenth jirimary gill-slits. The lower margin of the mouth is seen through the anterior gill-slits. Total length of larva, nearly 3*2 mm. posteriorly, as described above. The larva is remarkably transparent, so that its internal organisation can be seen as clearly as possible through the outer body-wall. The long axis of the primary gill-slits is approximately at right angles to the long axis of the body. They are not more numerous than the myotomes in the correspond- ing region of the body, so that the hranclnomcry at this stage coincides with the muscular vietaviery. In Fig. 'ji the first gill-slit was somewhat larger than the second and third. At about that stage, however, its further growth became arrested, and now it is seen to be considerably smaller than those which immediately follow it. In addition to its external opening on the left side, be- 5r<v-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and app

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