This is an important point to make certain of in settling any doubtful features in the nervous supply of the lateral line.
A mark called the subdorsal or lateral line is an excellent guide for this.
Specimens from there have the lateral line enlarged and the maximum seen in this species of Ochraceous color ventrally.
Oblique lines, of the darker color of the back, running forward and downward to a little below the lateral line.
Fish scales should also be procured, and specimens should be taken from the lateral line.
In Elasmobranchii (Scyllium) the lateral line is formed as a linear thickening of the mucous layer of the epidermis.
Below the lateral line are a number of small spots forming irregular lines running backward and upward.
Some of these specimens are reddish on the cheek and lateral line.
Its color is silvery, darker above, with a number of dark stripes along the sides, four or five being above the lateral line.
I would know even the number of their fin-rays, and how many scales compose the lateral line.
|lateral line |
A series of tubelike canals along the head and sides of fish and some amphibians by which vibrations, as from water currents, and changes in pressure are detected.