. A manual of zoology. Zoology. Fig. 203.—Astrangia dance*; five polyps in various stages of expansion. Fig. 204.—Cainria arabica (after Klunzinger). all seas from tide marks to the greatest depth. A few are free, but most are sessile. Metridium* Bunodes* Sagartia* Bicidium* (parasitic on Cyoiiea), Halcampa*. Zoanthe^e have two kinds of alternating mesenteries, individuals of the colonies usually incrusted with foreign matter. EpiztaHthus''' lives symbi- otically with hermit crabs (fig. 114). Sub Order II. ANTIPATHARIA. Six pairs of septa and six (Antipathcs) or twenty- four (Gerardia) simple
. A manual of zoology. Zoology. Fig. 203.—Astrangia dance*; five polyps in various stages of expansion. Fig. 204.—Cainria arabica (after Klunzinger). all seas from tide marks to the greatest depth. A few are free, but most are sessile. Metridium* Bunodes* Sagartia* Bicidium* (parasitic on Cyoiiea), Halcampa*. Zoanthe^e have two kinds of alternating mesenteries, individuals of the colonies usually incrusted with foreign matter. EpiztaHthus''' lives symbi- otically with hermit crabs (fig. 114). Sub Order II. ANTIPATHARIA. Six pairs of septa and six (Antipathcs) or twenty- four (Gerardia) simple tentacles; colony with a black horny axis and no calcareous skele- ton. Simulate the Gorgonids. Sub Order III. MADREPORARIA (Scleroderma). This group, the richest in species of any, is characterized by the great development of the skeleton. Theca, septa, and usually columella are present, and fre- quently costae as well. Solitary forms are few. Usually they form colonies, frer^uently of thousands of individuals, bound together by a ccenosarc extending over the surface of the coral. A colony arises from a single animal by continued fission or budding. When the division is not complete the ani- mals may form long series with numerous mouths but with the other parts united, the result being that the surface of the coral is marked by long mnding grooves—incompletely separated theca—with sclero- septa, as in the brain corals (fig. 204). The fossil Tetracoralla (p. 230) are now regarded as modified Hexacorallans. (i) The Aporosa, a compact skel- eton, the gastral canals running outside of the skeleton. Some, like Sderophylla (fig. 198), are solitary. Others, like Oculina,* branch, and still others form. Fig. —Ffiviii cavernosa (after Klunzinger).. 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 Hertwig,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
