Sentence Examples


  • The nervous system of the medusa consists of sub-epithelial ganglion-cells, which form, in the first place, a diffuse plexus of nervous tissue, as in the polyp, but developed chiefly on the subumbral surface; and which are concentrated, in the second place, to form a definite central nervous system, never found in the polyp. In Hydromedusae the central nervous system forms two concentric nerverings at the margin of the umbrella, near the base of the velum.
  • The possession of definite senseorgans at once distinguishes the medusa from the polyp, in which they are never found.
  • The endoderm of the medusa shows the same general types of structure as in the polyp, described above.
  • (In Hydra, on the other hand, the individual is usually hermaphrodite.) The medusa always reproduces itself sexually, and in some cases non-sexually also.
  • Mesogloea of the medusa is largely developed and of great thickness in the umbrella.
 

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