Natural History of New York Volume 1, V. 5-6

Natural History of New York Volume 1, V. 5-6

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1843 edition. Excerpt: ...the shell is replaced by a cartilaginous membrane. We shall consider his class Brachiopoda as a section of the Acephala, with which they have many characters in common; although the position of the animal in its shell, with its back against the hinge, differs from other bivalves. SECTION l. BRACHIOPODA. ANIMAL enveloped in a bilobed mantle, which is always open. Mouth anterior, and furnished with a pair of fleshy arms with curled filaments at their edges, and capable of being ea'tended externally. The gills applied to the internal surface of the lobes of the mantle. Vent anterior. Organs of generation unknown. SHELL bivalve, united behind either with or without a hinge, opening in front. F AMIL Y TEREBRA T ULIDE. ANIMAL more or less globular or flattened, with the montle open in front and towards the side. SHELL inequivalve, equilateral, with a hinge, and adhering to other bodies either directly or by means of a tendinous cord. EX TRA-LIMI TAL. Genus TEREBRATULA, Bruguieres. Animal with the gills arranged in a pectinated form on the inner surface of the mantle; the long arms rolled into a spiral form when at rest. Shell variable in its form, often ribbed: one valve prolonged into a recurved beak, and perforated at its tip, for the passage of a ligament, by which it attaches itself to foreign bodies; two bony processes on the interior of the smaller valve. T. caput-serpentis, Linn, Gould. (_T. septentrionalis, COUTHOUY, Bost. Journ. VoL 2, p. 65. PL. 34, fig. 321 of this work.) Shell rather thin, semitransparent, ovate: upper valve truncated hori--zontally at the apex; foramen large, one side completed by the apex of the lower valve; surface with a downy epidermis, under which minute radiating strize. From under each tooth in more

Product details

  • Paperback | 126 pages
  • 189 x 246 x 7mm | 240g
  • United States
  • English
  • black & white illustrations
  • 1236838130
  • 9781236838131