. Contributions to the natural history of the United States of America. Zoology; Chelonia (Genus); Ctenophora; Cnidaria; Animals. 46 ACALEPHS IN GENERAL. Part I. coinbiiuHl Thaninoenidiii (Xo]. 4, PI. XXII.) has lour distinct teiitack's and a large proboscis, but neither radiating nor circular tubes. Paryidia (Vol. 4, PL XXIII.) f\g. Trochopyxis, Ag. New genus of Cnmpanuhiria'. aa Common basis of the community. â 4 Fertile Hydra, âcd Stems of sterile liyiiTW. â e g Sterile Ilyilia> expanded. â/ Secondary sterile llydra bud. f;-j. 16. Fis. 17 also has tentacles, but of a very diflerent
. Contributions to the natural history of the United States of America. Zoology; Chelonia (Genus); Ctenophora; Cnidaria; Animals. 46 ACALEPHS IN GENERAL. Part I. coinbiiuHl Thaninoenidiii (Xo]. 4, PI. XXII.) has lour distinct teiitack's and a large proboscis, but neither radiating nor circular tubes. Paryidia (Vol. 4, PL XXIII.) f\g. Trochopyxis, Ag. New genus of Cnmpanuhiria'. aa Common basis of the community. â 4 Fertile Hydra, âcd Stems of sterile liyiiTW. â e g Sterile Ilyilia> expanded. â/ Secondary sterile llydra bud. f;-j. 16. Fis. 17 also has tentacles, but of a very diflerent Ibrni, and ii large proboscis, but no chyniit'erous tubes. In the family of Cauipanulariiv, the Hydroids seem to differ greatly from the Tuliularite, the stem being horny, and the bell-shaped animal surrounded by a horny IjcU ; Init a, micro- scopic examination of the surface of the stem, and even of the bell, of all Hydroids, shows that the only difference in the outer layer of the animal consists in the thickness of that h^'aline layer which in Campanularia and Sertularia )) so firm as to assume permanent forms and to be visible to the naked eye as a sort of horny sheath enclosing all the soft parts, while in Tubidaria it is soft and flexible. This once understood, the difference between a Campanularia [F/ff. 15) and a Tubularia head is only such as we shoidd expect Ijetween members of differ- ent families, â they differ in form only. Yet there is another distinction to be made among thein. The individuals of the same commimity. imited u})ou the same stem but arisuig from different axes, exhiljit marked differences among themselves: the larger numl)er, which have all the same form, re- of the Cam- panularia represented in uiaiu lor ever stcrilc {J^/ff- l'">, c d), while oth- ers, of a different form, produce buds along their internal proboscis {Fir/. Ki d^, cP, d"\ d^, id', d'\ d'), which in due time free themselves and swim off as dist
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