Mittheilungen aus der Zoologischen Station zu Neapal, 4권

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171 페이지 - I have not myself completely followed the development of the pituitary body in Petromyzon, but I have observed a slight diverticulum of the stomodaeum, which I believe gives origin to it. Further details are in any case required before we can admit so great a divergence from the normal development as is indicated by SCOTT'S Statements.
80 페이지 - ... unequal parts. The two-cell stage is followed by one of three cells, and this by one of four. Three of the four cells form a cap to the fourth (fig. 71), and gradually envelope it by epibolic expansion. A Gastrula is thus formed consisting of a small number of ectodermic cells and a single central endodermic cell (figs. 76 and 77) . Periods of growth intervene between the successive cleavages, the individual cells attaining, each time, approximately the size of the original germ-cell. The blastopore...
216 페이지 - Callithamnia und Polysiphonia bestimmte. Die erstere fand er in »einer dritten Art der Hornschwämme«, die letztere in Halichondria aspera. Beide Algen fanden sich in oder an der Hornsubstanz und zeigten in ihrem Verhalten der Hornsubstanz gegenüber einen merkwürdigen Unterschied. Die Verzweigungsart der Polysiphonia ist nämlich ganz abweichend von der Verästelungsweise der Hornsubstanz und ist innerhalb der Halichondria unverändert, so dass die Hornsubstanz das Charakteristische ihrer Verzweigung...
513 페이지 - Raumtheilen filtrirten Hühnereiweißes und Glycerines und streicht davon mit einem feinen Pinsel eine recht dünne und gleichmäßige Schicht auf den kalten Objectträger auf. Dann legt man die Schnitte auf, erwärmt das Ganze einige Minuten im Wasserbade und kann nun die Schnitte mit Terpentinöl , Alkohol , Wasser und Farbstoffen behandeln, ohne ein Wegspülen befürchten zu müssen. Das Glycerin dient nur...
175 페이지 - Infundibulnm hinaus. Die Hypophysis von Petromyzon aber ist beträchtlich länger, denn , wie schon angedeutet, ist die ganze v[on den Autoren als Nasengang, blinder Nasensack oder Spritzsack beschriebene Bildung nichts Anderes als die vergrößerte Hypophysis.
50 페이지 - ... germ-cells takes place in one case within , in the other outside, the parent cell. The similarity between the germogen and the axial cell with respect to the formation of germ-cells called forth the following remark from VAN BENEDEN : »Ces germes se forment donc dans les cellules germigenes a peu pres comme les germes des embryons vermiformes dans le corps de la cellule endodermique.
6 페이지 - S. officinalis , have each two species of Dicyema. 2. One species of Dicyema occurs in at least two different species of Cephalopod , while another is found in at least three different Cephalopods. 3. Two species, D. Eledones Wag. and D. gracile Wag., found in Cephalopods belonging to two different families (E. moschata and S.
81 페이지 - Über das Vorkommen von Entozoen und Krystallablagerungen in den schwammigen Venenanhängen einiger Cephalopoden.« FRORIEP'S 'Neue Notizen' Bd. XI, No. 234, p. 214, 1839. 11. Leuckart. »Bericht üb. d. wiss. Leist. d. nied. Thiere« 1876 — 1879, p. 210— 215. 'Arch. f. Naturgesch.
75 페이지 - The fact that these polar cells become muscle-fibrils in one case, and germ-cells in the other, is no objection to the opinion that they are morphological equivalents. It is on this ground that the Dicyemids may be said to have a transient triploblastic stage, represented by an ectodermal layer, an axial endodermic cell, and two intermediate mesodermic cells derived from the two poles of the endodermic cell.
52 페이지 - ... stage 110, and probably still later. By the time stage 109 is reached, or soon after, the germogen becomes the seat of endogenous cell-formation. How the first cells arise within the germogen, I have not been able to ascertain; but it is probable that they originate in the first instance by a division of the nuclens of the gerroogen, as is the case in the vermiform embryo.

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