In Figs. 60 and 61 we have a representation of our little Eucope, one of the prettiest of the Jelly-fishes belonging to this group; Fig. 57 represents the Hydroid from which it arises; a single branch with the reproductive bell being magnified in Fig. 58. In Fig. 59 is seen a portion of the Jelly-fish disk, with the fringe of tentacles highly magnified. The disk of the Eucope (Fig. 60) looks like a shallow bell, of which the proboscis often seems to form the handle; for the disk has such an extraordinary thinness that it turns inside out with the greatest ease, so that the inner surface may become at any moment the outer one, with the proboscis projecting from it, as in Fig. 60, while the next movement of the animal may reverse its whole position, and the proboscis then hangs down from the inside, as in other Jelly-fishes. (See Fig. 61.) [Illustration: Fig. 59. Part of marginal tube and tentacles of Eucope, greatly magnified; _e_ eye-speck, _b_ base of tentacle., _r_ reentering base of tentacle.] [Illustration: Fig. 60. Young Eucope; magnified.] [Illustration: Fig. 61. Adult Eucope seen in profile; magnified.] [Illustration: Fig. 62. Quarter disk of Fig. 60, seen from below; _e e_ tentacles bearing eye-speck.] The tentacles are solid and stiff like little hairs, and two of them, in each quarter-segment of the disk, have small concretions at the base, which are no doubt eye-specks. (See Fig. 62.) Along the chymiferous tubes little swellings are developed, which increase gradually, and become either ovaries or spermaries, according to the sex of the animal. (Fig. 63.) In the adult the genital organs hang down, like elongated bags, from the chymiferous tubes. (Fig. 64.) The tentacles are numerous, multiplying to about a hundred and ninety-two in the adult, and increasing according to the numerical law to be explained in the description of the Oceania. [Illustration: Fig. 63. Quarter-disk of young Eucope, older than Fig. 62, with a second set of tentacles (2) between the first set (1).] [Illustration: Fig. 64. Magnified quarter-disk of adult Eucope.]