Fishes . st Indies, and Pomacanthns zonipectus, Mojarra de lasPiedras, of the west coast of Mexico. All are good food-fishes,but lacking the brilliant colors of Holacanthiis and the finepattern usual in Chcetodon. The Pygaeidae.—Between the CJiatodontidcs and the AcanthiiridcBwe would place the extinct family of Pygccidcc, of the Eocene. InPygcEiis gigas and other species the dorsal spines are strong andnumerous; there are 5 to 8 species in the anal fin, the scalesare shagreen-like, and the teeth seem coarser than in the Chceto-dontidcs. The tail is apparently unarmed, and the soft dorsal, asi
Fishes . st Indies, and Pomacanthns zonipectus, Mojarra de lasPiedras, of the west coast of Mexico. All are good food-fishes,but lacking the brilliant colors of Holacanthiis and the finepattern usual in Chcetodon. The Pygaeidae.—Between the CJiatodontidcs and the AcanthiiridcBwe would place the extinct family of Pygccidcc, of the Eocene. InPygcEiis gigas and other species the dorsal spines are strong andnumerous; there are 5 to 8 species in the anal fin, the scalesare shagreen-like, and the teeth seem coarser than in the Chceto-dontidcs. The tail is apparently unarmed, and the soft dorsal, asin Chcetodon, is much shorter than the spinous. To this family The Squamipinnes 617 the Eocene genera, Aulorhamphus (bolceiisis), with producedsnout, and Apostasis {croaticus), with long spinous dorsal, prob-ably belong. The Moorish Idols: Zanclidae. — The family of Zanclidw in-cludes a single species, the Moorish idol or kihi kihi, Zancluscanescens. In this family the scales are reduced to a fine sha-. FiG. 511.—The Moorish Idol, Zanchts canescens (Linnijeus). From Zanclidit. (Painting by Mrs. E. G. Norris.) green, and in the adult two bony horns grow out over the dorsal spines are prolonged in filaments and the color isyellow crossed by bars of black. Zanclus canescens is a veryhandsome fish with the general appearance and habit of aChcEtodon, but the form is more exaggerated. It is foundthroughout Polynesia, from Japan to the oft-shore islands of 6i8 The Squamipinnes Mexico, and is generally common, though rarely entering rockpools. Zanclus eocmnus is recorded from the Italian Eocene. The Tangs: Acanthuridae.—In the next family, AcanthuridcB,the surgeon-fishes or tangs, the scales remain small and shagreen-like, the body is more elongate, the gill-openings still morerestricted, and the teeth are flattened and incisor-like. The pubicbone is more elongate, and in all the species some sort of arma-ture is developed on the side of the tail. The spino
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