Online Encyclopedia

ORDERII

Online Encyclopedia
Originally appearing in Volume V04, Page 366 of the 1911 Encyclopedia Britannica.
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ORDERII. Neotremata (Beecher) .— 2. Deltidium. More or less circular, cone-shaped, 3. Margin of delthyrium. inarticulate Brachiopoda. The pedicle 4. Pedicle-opening. passes out at right angles to the plane 5. Dorsal valve. of junction of the valves of the shell; the opening is confined to the ventral valve, and may take the form of a slit, or may be closed by the development of a special plate called the listrium, or by a pseudo-deltidium. Pro-deltidium attached I to ventral valve. FAM ILI ES.—Ac ROT RETIDAE, SIPHONOTRETIDAE, TREMATIDAE, DISCINIDAE, CRANIIDAE. Class II. TESTICARDINES (ARTICULATA)
End of Article: ORDERII
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