| The apical surface of the pouch is smooth, whereas its sides as well as the adoral surface are lobate. |
| In front the peristome bends sharply to the right and extends as far as the right end of the adoral zone. |
| The region surrounded by the adoral zone is frequently drawn out into an anterior process, occasionally bearing a pigment mass. |
| The coiled shells are mostly nearly complete, but often the body chambers are broken ventrally and adoral parts are missing. |
| These structures improve the resistance of the ammonite septum to pressure upon its main surface in both adapical and adoral directions. |
| Therefore, in these early stages, the boundary can be drawn between these aboral plates and those formed adoral to the terminals. |
