| Since the front of the hypostoma is attached to this doublure, it stands high up within the vault and under the glabella. |
| The inner edge of the doublure appears to be entire, curved convexly outward. |
| They occur near the anterior margin of the segment, and near the inner end of the doublure. |
| It is also known that the epistoma is narrower and more firmly fused into the doublure in later than in earlier species. |
