The Squamipinnes 



43 



on -small crustaceans, worms, and the like. The analogy to the 

 butterfly is a striking one, giving rise to the English name, 

 butterfly-fish, the Spanish mariposa, and the Japanese chocho- 

 uwo, all having the same meaning. Fossil chaetodonts are 

 rather few, Ch&todon pseudorhombus of the Pliocene of France, 

 Holocanthus microcephalus and Pomacanthus subarcuatus of the 

 Eocene, being the only species recorded by Zittel. 



In the principal genus, Chatodon, the colors are especially 



FIG. 339. Black Angel-fish, Pomacanthus arcuatus (Linnaeus). Barnegat, 



New Jersey. 



bright. There is almost always a black bar across the eye, 

 and often black ocelli adorn the fins. This genus is wanting 

 in Europe. Chcetodon capistratus, striatus, and numerous other 

 species are found in the West Indies; Chatodon humeralis and 

 nigrirostris are common on the coast of Mexico. The center 

 of their distribution is in Polynesia and the East Indian Archi- 

 pelago. Ch&todon reticulatus, lineolatus, ulietensis, ornatis- 

 simus, ephippion, setifer, and auriga are among the most showy 

 species. Numerous closely related genera are described. In 

 some of these the snout is prolonged into a long tube, bearing 



