The species of _Holacanthus_, known as angel-fishes, are larger in size, and their colors are still more showy, being often scarlet or blue. In this genus the preopercle is armed with a strong spine, and there are fourteen or more strong spines in the dorsal. This genus has also its center of distribution in the East Indies, whence two species (_septentrionalis_ and _ronin_) with concentric stripes of blue range northward to Japan. _Holacanthus tibicen_, jet-black with one yellow cross-band, is found from the Riu Kiu Islands southward. The angel-fish or isabelita (_Holacanthus ciliaris_), orange-red, sky-blue, and golden, as though gaudily painted, is the best-known species. The vaqueta de dos colores or rock beauty (_Holacanthus bicolor_), half jet-black, half golden, is scarcely less remarkable. Both are excellent food-fishes of the West Indies. _Holacanthus passer_ is a showy inhabitant of the west coast of Mexico. _Holacanthus diacanthus_, orange, barred with blue, is one of the gaudiest inhabitants of the coral reefs of Polynesia. _Holacanthus flavissimus_, golden with some deep-blue markings, and _Holacanthus nicobariensis_, blackish with white circles, are found with other species in the same waters. The genus _Pomacanthus_ (_Pomacanthodes_) includes American species only, still larger in size and differing from _Holacanthus_ in having nine to eleven spines only in the dorsal fin. The young of _Pomacanthus_ are blackish, crossed by many curved yellow cross-bands, which disappear entirely with age. Three species are known, _Pomacanthus arcuatus_, the black angel, chirivita or portugais, _Pomacanthus paru_, the Indian-fish or paru of the West Indies, and _Pomacanthus zonipectus_, "Mojarra de las Piedras," of the west coast of Mexico. All are good food-fishes, but lacking the brilliant colors of _Holacanthus_ and the fine pattern usual in _Chætodon_. [Illustration: FIG. 341.—Rock Beauty, _Holacanthus tricolor_ (L.). Puerto Rico. ] =The Pygæidæ.=—Between the _Chætodontidæ_ and the _Acanthuridæ_ we would place the extinct family of _Pygæidæ_, of the Eocene. In _Pygæus gigas_ and other species the dorsal spines are strong and numerous; there are 5 to 8 species in the anal fin, the scales are shagreen-like, and the teeth seem coarser than in the _Chætodontidæ_. The tail is apparently unarmed, and the soft dorsal, as in _Chætodon_, is much shorter than the spinous. To this family the Eocene genera, _Aulorhamphus_ (_bolceusis_), with produced snout, and _Apostasis_ (_croaticus_), with long spinous dorsal, probably belong. [Illustration: FIG. 342.—The Moorish Idol, _Zanclus canescens_ (Linnæus). From Hawaii. Family _Zanclidæ_. (Painting by Mrs. E. G. Norris.) ]