3086571 Ridged Egg case of catshark (Scyliorhinus), 1923 (litho) by Millot, Adolphe Philippe (1857 ??1921); Private Collection; (add.info.: Catsharks are ground sharks of the family Scyliorhinidae. They are one of the largest families of sharks with around 160 species placed in 17 genera. Although they are generally known as catsharks, many species are commonly called dogfish or gato. They feed on benthic invertebrates and smaller fish;); Prismatic Pictures ; French, out of copyright.