Sentence Examples


  • Clitellum not present as a definite organ, as in Oligochaeta.
  • It is a remarkable and newly-ascertained fact that in regeneration (in Potamilla) the thorax is not replaced by the growth of uninjured thoracic segments; but that the anterior segments of the abdomen take on the same characters, the setae dropping out and being replaced in accordance with the plan of the setae in the thorax of uninjured worms. Among the Oligochaeta the sexually mature worm is distinguished from the immature worm by the clitellum and by the development of genital setae.
  • Clitellum 37 always present, extendin over two (many limicolous forms) to forty-five seg ments (Alma).
  • The clitellum consists of a thickening of the epidermis, and is of two forms among the Oligochaeta.
  • It is therefore obviously much thicker than the clitellum in the limicolous forms. The position of the clitellum, which is universal in occurrence, varies much as does the number of component segments.

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