new icn messageflickr-free-ic3d pan white
Image from page 172 of "Ocean wonders: a companion for the seaside" (1879) | by Internet Archive Book Images
Back to photostream

Image from page 172 of "Ocean wonders: a companion for the seaside" (1879)

Identifier: oceanwonderscomp00damo

Title: Ocean wonders: a companion for the seaside

Year: 1879 (1870s)

Authors: Damon, William Emerson, 1838-

Subjects: Marine animals Aquariums

Publisher: New York, D. Appleton and company

Contributing Library: The Library of Congress

Digitizing Sponsor: The Library of Congress



View Book Page: Book Viewer

About This Book: Catalog Entry

View All Images: All Images From Book


Click here to view book online to see this illustration in context in a browseable online version of this book.



Text Appearing Before Image:

duction and growth are so anomalous as to have long baffledthe investigations of naturalists. Their nature is now betterknown, but we suspect there is much yet to be learned inregard to them. The hydroids are compound animals which produce in-dividuals ; and these individuals in their turn produce com- HYDROIDS, MEDUSAE, ETC. 151 pound progeny. Some of them look like shrubs, youngtrees, or bushes, and only minute investigation proves themto possess vitality, and to be in fact communities of indi-viduals arranged in a plant-like form; from these may behatched a single jelly-fish or medusa, and from the medusawill eventually be produced a group of hydroids. The hydroids belong to the division Acalephce, and areas a general thing semi-transparent, fragile, and often verygraceful objects, yet not always so harmless as they look. In


Text Appearing After Image:

Adult Sun-Fish, or Jelly-Fish (Aurelia, Agassiz). this division are included the large families of the campa-nularians, sertularians, tubularians, and others. The varietyof their forms is almost infinite. Some float through theseas like a branch covered with bell-shaped flowers; othersappear like groups of disks or cups; some are vase-shaped,some oval; some are iridescent spheres; some form gar-lands, or trail along like endless fringes; while possibly themost common and best known form is the umbrella shape,of which the beautiful haired medusa is the finest represent-ative, Q 152 THE OCEAN. When the hydroid is in the compound state, the plant-like community is enveloped with a thin covering of a hornynature, which also covers the hell-like cellules in which theprogeny are developed. When the latter arrive at a suffi-cient degree of maturity, this covering bursts and allows theescape of the young medusae. These productive cellules arealways developed in the angles formed by the juncti



Note About Images

Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.

7 faves