Sentence Examples


  • Polymorphism usually occurs, certain individuals having the form of avicularia or vibracula.
  • - Zooecia of Umbonula pavonella, showing a pair of minute avicularia on either side of the orifice of each zooecium.
  • The most singular of the external appendages found in the Polyzoa are the avicularia and vibracula of the Cheilostomata.
  • The avicularia and vibracula give valuable aid to the systematic study of the Cheilostomata.
  • Avicularia of this type occur in the common Flustra foliacea, in various species of Membranipora, and in particular in the Onychocellidae, a remarkable family common in the Cretaceous period and still existing.
 

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