| A biramous limb typically has a basal part, or protopodite, bearing two branches, an inner endopodite and an outer exopodite. |
| The anteriormost five abdominal appendages are, almost without exception, biramous. |
| At the end of the last thoracic segment, there is a minute abdomen, bearing three pairs of biramous cirri. |
| The maxillul are also biramous, but very different in form from those of the trilobite, and the maxill are phyllopodan. |
| Crustacean biramous appendages have a basal or first portion referred to as the protopod. |
| An answer lies, he says, in the origin and modification of the ancestral biramous limb. |
