Note 66 — Chapter IV
Reading edition
J. S. Kingsley in Q. J. Micr. Sci. (1885), has reviewed the homology of Insect, Arachnid, and Crustacean appendages, and comes to conclusions very different from those hitherto accepted. He classifies the appendages as pre-oral (Insect-antennæ) and post-oral, and makes the following comparisons:—
Hexapoda.Acerata.Crustacea.
(=Insecta + Myriopoda?) (=Arachnida + Limulus.)
(1) Antennæ.Absent.Absent.
(2) Mandibles.Cheliceræ.Antennules.
(3) Maxillæ.Pedipalpi.Antennæ.
(4) Labium.1st pair legs.Mandibles.
(5) 1st pair legs.2nd pair legs.1st Maxillæ.
(6) 2nd pair legs.3rd pair legs.2nd Maxillæ.
(7) 3rd pair legs.4th pair legs.1st Maxillipeds.
Pelseneer (Q. J. Micr. Sci., 1885), concludes that both pairs of antennæ are post-oral in Apus, and probably in all other Crustacea.