The microscope and its revelations . of which orgamsation seems toone end is extendedinto the thread-likeor dart-like prolonga-tion, but which isdoubled-in upon it-self, in such a mannerthat the armature ap-pears to be containedin its interior; andthat the springing-outof the dart is due tothe eversion of theportion of the cellwhich had previouslybeen thread-cells arefound, however, not .merely in the tenta-cles and other parts ofthe external integu-ment of HelianthoidZoophytes, but alsoin the long filamentswhich lie in coilswithin the chambersthat surround the sto-mach,
The microscope and its revelations . of which orgamsation seems toone end is extendedinto the thread-likeor dart-like prolonga-tion, but which isdoubled-in upon it-self, in such a mannerthat the armature ap-pears to be containedin its interior; andthat the springing-outof the dart is due tothe eversion of theportion of the cellwhich had previouslybeen thread-cells arefound, however, not .merely in the tenta-cles and other parts ofthe external integu-ment of HelianthoidZoophytes, but alsoin the long filamentswhich lie in coilswithin the chambersthat surround the sto-mach, in contact withthe sexual organswhich are attached tothe lamellse dividingthe chambers. It wasformerly supposed thatthe last-named organswere always ovaria,and that the long andslender filaments con-tain sperm-cells andare consequently themale organs. But sinceit has been proved that Filiferous Capsules of Helianthoid Polypes:—a, b, Corynactis Allmanni;c, E, Pj Caryophyllia Smithii ; D, g. Actinia crassicornis; H, Actinia 552 ZOOPHYTES. the peculiar filiferous capsules which lie side by side in thesefilaments are reaUy identical in structure with those which arefound in the skia, the idea of their sexual nature has been aban-doned; and a more careful examination of the organs attached tothe walls of the chambers has shown, that these are not alwaysovaries, but that they sometimes contain sperm-cells, the twosexes being here divided, not united in the same can be the office of the filiferous filaments thus containedin the interior of the body, it is difficult to guess-at. They areoften found to protrude-from rents in the external tegument,when any violence has been used in detaching the animal fromits base; and when there is no external rupture, they areoften forced through the wall of the stomach into its cavity,and may be seen hanging-out of the mouth. The largest ofthese capsules, in their- unprojected state, are about l-300thof an inch in length:
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Keywords: ., bookcentury1800, booksubjectmicroscopes, booksubjectmicroscopy
