. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. THE STARFISH. Certain starfishes have many arms instead of only five.' In still other starfishes the raj's are partiallj' connected by a mem- brane like the web of a duck's foot, so that the whole outline is nearlj' pentagonal (Fig. 244). In extreme cases the outline becomes strictly pentag- onal or even approxi- mately circular in plan, like a sea-urchin. The last species shows a transi- tion between starfish and urchin. The Serpent-stars.â In the serpent-stars (Ophiu- Fig. 243. â Solaster, a multi-rayed s
. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. THE STARFISH. Certain starfishes have many arms instead of only five.' In still other starfishes the raj's are partiallj' connected by a mem- brane like the web of a duck's foot, so that the whole outline is nearlj' pentagonal (Fig. 244). In extreme cases the outline becomes strictly pentag- onal or even approxi- mately circular in plan, like a sea-urchin. The last species shows a transi- tion between starfish and urchin. The Serpent-stars.â In the serpent-stars (Ophiu- Fig. 243. â Solaster, a multi-rayed starfish. â 1 2\ Reduced. From LeunLs. oridea'^j the organs are not prolonged from the disk into the arms, consequently the arms may be thrown off without injury to the ani- mal; hence the name " ; The brittle- stars fall into two groups, in one of which, the serpent- stars, the arms are un- branched,^ while in the ^ It is so in the case of Sohistcr endeca of the northern Athmtic (Fig. 243). 2 ophis, serpent ; oura, tail. " Fig. 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 Davenport, Charles Benedict, 1866-1944; Davenport, Gertrude Anna Crotty, 1866- joint author. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1911
