. Annual report of the Regents. New York State Museum; Science. 446 Report of the State Geologist. The tentacular crown may be divided into two portions: the disc which surrounds the mouth and to which is given the name lophophore, and the tentacles which are inserted on the margin of the lophophore. In all the marine species and in one fresh-water species, Paludicella Ehrenbergi, the lophophore is continuous around the mouth; the tentacles being arranged in a complete circle. In the other fresh-water forms the arrangement is bilateral. The lophophore is extended in two triangular arms; the te
. Annual report of the Regents. New York State Museum; Science. 446 Report of the State Geologist. The tentacular crown may be divided into two portions: the disc which surrounds the mouth and to which is given the name lophophore, and the tentacles which are inserted on the margin of the lophophore. In all the marine species and in one fresh-water species, Paludicella Ehrenbergi, the lophophore is continuous around the mouth; the tentacles being arranged in a complete circle. In the other fresh-water forms the arrangement is bilateral. The lophophore is extended in two triangular arms; the tentacles, ar- ranged continuously on the margin of the disc and the arms are disposed in a horseshoe form. From the mouth descends the oesophagus; at first a little expanded, then contracting and con- tinuing nearly straight to its terminus. The upper, expanded portion may be called the pharynx. The walls are thickly studded with minute oval spots. In the marine species the oeso- phagus leads into an oval sac, which performs the office of a gizzard (Plate B, ^g. a, 3). The walls of this cavity are thicker than those of any other portion of the alimentary canal. In the walls are two dark bodies, opposite to each other (fig. 16), with radi- 16a. 16&.. 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 New York State Museum; University of the State of New York. Board of Regents. Albany : J. B. Lyon, State Printer
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Keywords: ., bookauthorne, bookcentury1800, bookdecade1880, booksubjectscience
