. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Activities of Polar Bodies. 113 a marked astrosphere-like mass at each end, so that the entire figure is strangely like similar appearances in caryokinesis. With exceptional light some of the spin-threads are seen to pass up to the egg-membrane and to branch; others go to the surface of the ^gg. Here, as in the starfish, the changes that take place, the making of new processes and the with- drawal and bending of old, make it difficult to represent the actual appearances, even
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Activities of Polar Bodies. 113 a marked astrosphere-like mass at each end, so that the entire figure is strangely like similar appearances in caryokinesis. With exceptional light some of the spin-threads are seen to pass up to the egg-membrane and to branch; others go to the surface of the ^gg. Here, as in the starfish, the changes that take place, the making of new processes and the with- drawal and bending of old, make it difficult to represent the actual appearances, even if it were possible to adequately express by black lines the optical effect produced by these clear protoplasmic filaments, which bear as much resemblance to fine spun-glasswork as to any other common gross object. In a nudibranch moilusk, Tergipes despectus (?), there are often three polar bodies that remain in close association till the larva is a pyramidal many-celled mass. In some cases a connexion was seen, a changing process or processes, ex- tending between a polar body and the Qgg and between one body and another; generally the connexion escaped observa- tion, though the bodies acted as if held together. In the case shown in figure 3 the small objects near the largest polar Fig. body were seen to change position, and may have been either foreign or loose particles, or else enlargements upon filose processes so fine as to escape detection with the 6 ocular and 2 millim. objective. Similar objects near the next polar body proved to be a group of blunt pseudopodia-like outgrowths borne upon a common stalk. From the remaining polar body similar blunt processes projected in various directions separately, and one very long process extended upward to the egg-membrane, where it branched and seemed attached by its several side- threads. This last polar body also sent out a process that apparently attached itself to the surface of the ^gg, which was still in an undivided stat
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