McCoy [M'Coy], Fredrick. (1844). Annelida. pp. 168-171. In: Griffith, Richard (Ed.). A synopsis of the characters of the Carboniferous limestone fossils of Ireland. University Press, Dublin. 207 pp., 29 plates.
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The Annelida, or red-blooded worms, are the least highly organized group of the Annulosa, or articulated animals; the forms found in the carb. limestone belong to Cuvier's order Tubicola, or those sedentary species having the gills attached to the head, and inhabiting a tube, sometimes shelly, as in Serpula, sometimes nearly membranous, or formed of agglutinated grains of sand, as in Terebella or Sabella.