This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 Excerpt: ...have also been recently recognized by Burger (Appendix to Literature on Nemertini) to be nephridia, and their origin is likewise referred by this author to the ectodermal anterior intestine.--K.J split off directly from the larval skin. This process takes place on the free-swimming larva, for long before this the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 Excerpt: ...have also been recently recognized by Burger (Appendix to Literature on Nemertini) to be nephridia, and their origin is likewise referred by this author to the ectodermal anterior intestine.--K.J split off directly from the larval skin. This process takes place on the free-swimming larva, for long before this the embryo had broken through the eggmembrane. Even at the time of its becoming free, it exhibits at its anterior and posterior ends stout cilia (Fig. 108), which are likewise a reminiscence of the pilidium stage. Stout cilia, or tufts of cilia, arise at the ends of the body of the embryo even in those forms in which the development has become quite direct (Amphiporux, Telrastemma, Malacobdella), and in which no other points in harmony with indirect development are still found, --apparently an indication that development by means of a ciliated free-swimming larva Fis-108.--Embryo of is the more primitive mode, direct deOpkaiofhrit gaM)ux yelopment, on the contrary, the derived just hatched (after r " Duck;. method. Cleavage and the production of the germ-layers in the forms developing directly do not appear always to take place in the manner which we have hitherto considered. In Monopora vivipara, it is true, after an irregular cleavage there arises from the hlastula an invagination gastrula (salenSky); other forms, on the contrary (Amfihiporui lactiftoreiu, Polia carcinophila, Tetrastemma varicolor), are said to possess a delatnination gastrula (barrois, Hoffmann). The sheet of long prismatic cells which forms the blastula splits into an outer and an inner layer. The former corresponds to the ectoderm, whereas the latter again separates into a double layer, the outer one the mesoderm, the inner one the entoderm. In Telrastemma the differentiation ...
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