. Journal of morphology. iWinter, Frankfurt ^M .Joiiriuil of Mor/i/iohfj!/. !! 414 EYCLESHYMER. EXPLANATION OF PLATE XX. Figs. i-6. Surface views of successive stages in the formation of the embryoof Amblystoma punctatum (X 15). Fig. I. Surface view, showing irregular depression among yolk cells atvegetative pole, also first indication of blastopore (X 15). Figs. 2, 3. Surface views of postero-ventral surface, showing later stagesin extension of blastopore (X 15). Figs. 4, 5, 6. Surface views of postero-ventral portion, showing successivestages in closure of blasto
. Journal of morphology. iWinter, Frankfurt ^M .Joiiriuil of Mor/i/iohfj!/. !! 414 EYCLESHYMER. EXPLANATION OF PLATE XX. Figs. i-6. Surface views of successive stages in the formation of the embryoof Amblystoma punctatum (X 15). Fig. I. Surface view, showing irregular depression among yolk cells atvegetative pole, also first indication of blastopore (X 15). Figs. 2, 3. Surface views of postero-ventral surface, showing later stagesin extension of blastopore (X 15). Figs. 4, 5, 6. Surface views of postero-ventral portion, showing successivestages in closure of blastopore, also the formation of neural folds (X 15).Fig. 7. Ventral surface view of extremely large blastopore (X 15).Figs. 8, 9. Surface views of blastopore of Rana palustris (X 15).Fig. 10. Surface view of Petromyzon marinus, drawn from living egg by , showing lateral extension of the blastopore (X 30). Figs. 11-14. Surface views of Amiurus catus, showing formation of embryo (Xi5)- Fig. 15. Shows portion of germ-ring left behind the embryo. Fig. 16. Surface view of Coregonus albus, showing late
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Keywords: ., bookcentury1800, bookdecade1, booksubjectphysiology, bookyear1887
