| Due to the reduction of the hyoid and branchial arches, no other means than the suction flow seems to be available for this function. |
| The lenticular process is actually derived from mesenchyme attributed to the second branchial. |
| Numerous small pustules occur on surface of branchial regions. |
| The inner surface of the right operclc can be observed, and also some branchial arch elements such as the ceratobranchial and hypobranchial. |
| The ventral branchial arch segments of placoderms are so poorly known that nothing useful can be said. |
| The branchial basket was braced against the body wall and unjointed, as in lampreys. |
