"Dermal dentricles of <em>Centrophorus</em>."&mdash;Finley, 1917

Dermal dentricles of Centrophorus

"Dermal dentricles of Centrophorus."—Finley, 1917

"A block out of the skin. a, dead part and d live part of the epidermis; e, sweat glands; n, nerve endings." &mdash;Davison, 1910

Section of skin

"A block out of the skin. a, dead part and d live part of the epidermis; e, sweat glands; n, nerve endings."…

"Dermal spines of a male Thornback, Raia clavata." &mdash; Encyclopedia Britannica, 1893

Spines

"Dermal spines of a male Thornback, Raia clavata." — Encyclopedia Britannica, 1893