. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. THE NErROMOTOK Al'I'AKATfS OF C M V! )ODOX SP. 475 side, take their origin as said zone, and extend in curved lines to the posterior boundary of the railroad track. The three central rows begin at the posterior end of the myoneme surrounding the mouth, and extend to the posterior end of the " railroad track " in the same manner as the other rows, Fig. 2. Fig. I B shows the manner in which the " railroad track " bounds the rows of FIG. 3. Sections showing various changes in shape of the "
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. THE NErROMOTOK Al'I'AKATfS OF C M V! )ODOX SP. 475 side, take their origin as said zone, and extend in curved lines to the posterior boundary of the railroad track. The three central rows begin at the posterior end of the myoneme surrounding the mouth, and extend to the posterior end of the " railroad track " in the same manner as the other rows, Fig. 2. Fig. I B shows the manner in which the " railroad track " bounds the rows of FIG. 3. Sections showing various changes in shape of the " railroad ; FIG. 4. Sections of entire animal showing changes in the shape of the " rail- road track," and changes in the shape of the animal. The peciliar organelle known as the " railroad track " is a band of trichites encircling the animal in the manner shown in Fig. i B. In some of the older papers, the exact location of this band is a matter of discussion. We were able to pierce the dorsal wall of the animal with a micro pipette, and blow out the cell contents, in- cluding the pharyngeal basket; nothing was left except the body wall, almost entire, and the " railroad ; Its position was un- changed. It is covered with a thin pellicle, and fastened tightly to it. With the micro dissection needles, the track was cut out and pulled apart. While it was easier to tear apart where it was thin, we could not duplicate the effect shown by Erlanger. The figure in Erlanger's paper seems to show the parts of the " railroad track " easily separable into round masses of protoplasm, each hav- ing a trichite in the center. If the animal is viewed from the ventral side, the structure looks flat, and the trichites arranged after the manner of crossties, hence the name " railroad ; A side view of whole mounts, easily obtainable, and sections, shows that the ordinary shape of this structure is half a circle. The organell
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
