. Elements of zoölogy. Zoology. 34 STAR-FISHES, SEA-URCHINS, ETC. ages called pedicellaricz, c, having three calcareous jaws. Between the arms, on the upper surface, is a hard, flat, pinkish body, perforated with holes, called "the madre- poric plate," h. The under surface of the rays is chan- neled, the plates being pierced with four rows of minute holes. Internal Organs.—The mouth, //z, is on the under sur- face, and leads into the stomach, s, which is seen ex- tending into the rays, ending in a short intestine, to which is attached the green, branching liver, /. About the mouth ex
. Elements of zoölogy. Zoology. 34 STAR-FISHES, SEA-URCHINS, ETC. ages called pedicellaricz, c, having three calcareous jaws. Between the arms, on the upper surface, is a hard, flat, pinkish body, perforated with holes, called "the madre- poric plate," h. The under surface of the rays is chan- neled, the plates being pierced with four rows of minute holes. Internal Organs.—The mouth, //z, is on the under sur- face, and leads into the stomach, s, which is seen ex- tending into the rays, ending in a short intestine, to which is attached the green, branching liver, /. About the mouth extends a ring, that throws off a delicate nerve to the eye, e, at the tip of each ray ; other cords also extend to each sucker, / /, this constituting the nerv- ous system. Circulation.—There is a system of blood-vessels, but. Fig. 31.—Pentacrinus caput medusa. what is called the water-vascular system is most impor- tant, aiding in both locomotion and respiration. Water is taken in at the sieve-like madreporic plate h, flows down a tube, called the "stone canal," into the circular canal,. 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 Holder, Charles Frederick, 1851-1915; Holder, Joseph Bassett, 1824-1888, joint author. New York : D. Appleton and company
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
