A treatise on zoology . Vie. 11 i/df rill hitltrl- THli CIUNOIDKA 35. Fig. ].XV11I. Saccncoma. 1, S. iniella, from aboral snrfactt (after Jaekel, x f). 2, S. pectinctta, fromaboral snrfaco, to show coilinj,^ of arm-braiichos (x j). .i, .S. 2ec«i^«to, cxq) and proximalbrachials from side (after Zittel, x ;;). Order 2. Adunata (Bather, 1899). Moiiocyclica with dorsal cup primitively confined to the patina andan occasional single anal ; tegmen solid ; portions of the proximal Brand their Amb tend to be rigidly incorporated in the theca. Arms forkonce to thrice, and bear pinnules on e
A treatise on zoology . Vie. 11 i/df rill hitltrl- THli CIUNOIDKA 35. Fig. ].XV11I. Saccncoma. 1, S. iniella, from aboral snrfactt (after Jaekel, x f). 2, S. pectinctta, fromaboral snrfaco, to show coilinj,^ of arm-braiichos (x j). .i, .S. 2ec«i^«to, cxq) and proximalbrachials from side (after Zittel, x ;;). Order 2. Adunata (Bather, 1899). Moiiocyclica with dorsal cup primitively confined to the patina andan occasional single anal ; tegmen solid ; portions of the proximal Brand their Amb tend to be rigidly incorporated in the theca. Arms forkonce to thrice, and bear pinnules on each or on every other Br. BB fusedto 3, 2, or 1. {Eudadocriniis and Acrocrinidae offer peculiar exceptionsto this diagnosis.) The genera of this order have been referred, in whole or part, to theCamerata or their etj^uivalents by most recent writers. But most of theSilurian genera here included are admitted as close allies of MonocyclicaInadunata. If so, then they were derived from Inadunata ages after thetypical Camerata had appeared. Moreover, though the Devonian andCarboni
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
