Sentence Examples


  • In Velella the pneumatophore becomes of complex structure and sends air-tubes, lined by a chitin and resembling tracheae, down into the compact coenosarc, thus evidently serving a respiratory as well as a hydrostatic function.
  • Further, there is general agreement that the chitin-lined fore-gut and hind-gut, which form the greater part of the digestive tract, arise from ectodermal invaginaof the germ band a double fold in the undifferentiated blastoderm, tions (stomodaeum and proctodaeum respectively) at the positions which grows over the surface of the embryo, so that its inner and of the future mouth and anus.
  • In Lingula the shell is composed of alternate layers of chitin and of phosphate of lime.
  • They yield chitin in place of chondrin or gelatin - as does also the cartilage of the Cephalopod's endoskeleton.
  • While the fundamental constituent is a cellulose in many Mucorini and other Phycomycetes, in others bodies like pectose, callose, &c., commonly occur, and Wisselingh's researches show that chitin, a gluco-proteid common in animals, forms the main constituent in many cases, and is probably deposited directly as such, though, like the other substances, it may be mixed with cellulose.

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