Chromides and Pharyngognathi 



383 



in the West Indies and on the west coast of Mexico. Pomacen- 

 trus fuscus is the commonest West Indian species, and Pomacen- 

 trus rectifrenum the most abundant on the west coast of Mexico, 

 the young, of an exquisite sky-blue, crowding the rock pools. 

 Pomacentrus of many species, blue, scarlet, black, and golden, 

 abound in Polynesia, and no rock pool in the East Indies is 

 without several forms of this type. The type reaches its greatest 

 development in the south seas. About forty different species of 

 Pomacentrus and Glyphisodon occur in the corals of the harbor 

 of Apia in Samoa. 



Almost equally abundant are the species of Glyphisodon. The 

 ''cockeye pilot," or jaqueta, Glyphisodon marginatus, green with 



FIG. 315. Cockeye Pilot, Glyphisodon marginatus (Bloch). Cuba. 



black bands, swarms in the West Indies, occasionally ranging 

 northward, and is equally common on the west coast of Mexico. 

 Glyphisodon abdominalis replaces it in Hawaii, and the Asiatic 

 Glyphisodon saxatilis is perhaps the parent of both. Glyphisodon 

 sordidus banded with pale and with a black ocellus below the 

 soft dorsal is very common from Hawaii to the Red Sea, and is 

 a food-fish of some importance. Glyphisodon ccelestinus blue, 

 with black bands, abounds in the south seas. 



