The division of the group into Ecardines (Inarticulata), Figs.
The stomach then passes into an intestine, which in the Testicardines (Articulata) is short, finger-shaped and closed, and in the Ecardines (Inarticulata) is longer, turned back upon its first course, and ends in an anus.
The above account applies more particularly to Crania, but in the main it is applicable to the other Inarticulata which have been investigated.
The orders Atremata and Neotremata are frequently grouped together, as the sub-class Inarticulata or Ecardines - the Tretenterata of Davidson - and the orders Protremata and Telotremata, as the Articulata or Testicardines - i the Clistenterata of Davidson.
[[Ecardines (Inarticulata)4 --- Order I]].