; 4. Central bony element of the tongue; natural
size; 5. Lateral view of scale from the centre of the flank, showing the mucus canal of the lateral line; natural size (the light part
shows the hidden area, the dark part the exposed area); 6. A small piece of the exposed part of the scale; enlarged; 7. A small
piece of the hidden part of the scale; enlarged; 8. Outline of the body in a transverse section.