The second antennae, mandibles and two pairs of maxillae may also be claimed as of malacostracan type.
This " leaf-footed " suborder has the appendages which follow the second maxillae variable in number, but all foliaceous and branchial.
In these the furcal branches are linear or rudimentary, the shell is without rostral sinus, and, besides distinguishing characters of the second 2ntennae, they have always a branchial plate well developed on the first maxillae, which is inconstant in the other tribe.
The variable first maxillae are seldom pediform, their function being concerned chiefly with nutrition, sensation and respiration.
The variability in form and function of the second maxillae is sufficiently shown by the fact that G.