Sentence Examples


  • 40); in Geryonia, however, it remains double, and the centripetal canals arise by parting of the two layers; (4) excretory endoderm, lining pores at the margin of the umbrella, occurring in certain Leptomedusae as socalled " marginal tubercles," opening, on the one hand, into the ring-canal and, on the other hand, to the exterior by " marginal funnels," which debouch into the sub-umbral cavity above the velum.
  • Olindiadae, with four radial canals and four gonads; manubrium short; ring-canals giving off blind centripetal canals; tentaculocysts enclosed.
  • H, " Otoporpae " or centripetal process of the marginal cartilaginous ring connected with tentaculocyst.
  • Besides the internal or centripetal growth, some cell-walls are thickened on the outside, such as pollen grains, oospores of Fungi, cells of Peridineae, &c. This centrifugal growth must apparently take place by the activity of protoplasm external to the cell.
  • (For 1900 or Igor.) The movement of people from one place to another without the immediate intention of returning is known as migration, and accord ing to its origin it may be classed as centrifugal (directed a particular area) and centripetal (directed towards a particular area).

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