The Squamipinnes 615 
the jaws at itsend. Of this type are Chelmo in India, F orctpiger 
in Polynesia, and Prognathodes in the West Indies. Hentochus 
(macroleptdotus) has one dorsal spine greatly elongated. Micro- 
canthus strigatus, one of the most widely distributed species, is 
known by its small scales. Megaprotodon (trifascialis) has four 
anal spines instead of three as in the others. 
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 
Fig. 509.—Angel-fish or Isabelita, Holacanthus ciliaris (Linneus). Jamaica. 
Family Chetodontide. 
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 
