. The beginnings of embryonic development : A symposium organized by the Section on Zoological Sciences of the American Association for the Advancement of Science, cosponsored by the American Society of Zoologists and the Association of Southeastern Biologists, and presented at the Atlanta meeting, December 27, 1955. Embryology. 298 EARLY DETERMINATION IN DEVELOPMENT Vegetalizing and animalizing agents act on molluscs. Working with LiCl and other salts, Ranzi (1928) obtained a series of mon- sters of Loligo vulgaris (cephalopod) ranging from convergent eyes, to cyclopy, cyclopy with a small ey
. The beginnings of embryonic development : A symposium organized by the Section on Zoological Sciences of the American Association for the Advancement of Science, cosponsored by the American Society of Zoologists and the Association of Southeastern Biologists, and presented at the Atlanta meeting, December 27, 1955. Embryology. 298 EARLY DETERMINATION IN DEVELOPMENT Vegetalizing and animalizing agents act on molluscs. Working with LiCl and other salts, Ranzi (1928) obtained a series of mon- sters of Loligo vulgaris (cephalopod) ranging from convergent eyes, to cyclopy, cyclopy with a small eye and anophthalmia (Fig. 8). SCN~-treated embryos developed a large stomodaeum (stomodaeum rudiment is between eye rudiments) (Ranzi, 1944). Studying embryos with duplicitas cruciata, Ranzi (1931) reached the conclusion that in cephalopod embryos it is most. Fig. 8. Li+ effects on Lolifio embryos: A, control; B, convergent eyes; C, cyclopy; D, anophthalmy. (From Ranzi, 1928.) likely that an evocator is acting (entoderm?). I think that pos- sibly in cephalopods a rudiment hyperdeveloped by SCN~ and reduced by LiCl, as occurs for amphibian notochord, is involved. However, I have never carried out direct research to study this point nor have other authors investigated this problem. Thus today we cannot state positively whether an organizer exists in cephalopod embryos. Experimental embryology of cephalopods must be reconsidered. A great deal of material is available and may be handled quite Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Association for the Advancement of Science. Section on Zoological Sciences; Tyler, Albert, 1906-. Washington
Size: 1354px × 1845px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublisherwashington, booksubjectembryology
