SHORE FISHES OF GALAPAGOS ISLANDS 



339 



Hepatus aliala. R, Cl, C. 



Canthidermis angulosus. C. 



Cantherines sand-wichensis. R. 



Osbeckia scrota. R. 



Os tract on lentiginosum. C, G. 



Chilomycterus ajfinis. G. 



Of these 18 species only Galeocerdo tigrinum, Osbeckia scripta 

 and Chilomycterus ajfinis are known from the American main- 

 land coast. 



There is a small number of species that are peculiar to the 

 islands as a group, i. ., that occur at 2 or more of them but 

 are not known elsewhere. These are : 



Amia atradorsata. C, G. 



Lutianus viridis. R, C, G (Tres Marias Ids.) 



Pomacentrus leucorus. R, C, G. 



Pomacentrus arcifrons. C, G. 



Ichthy callus nicholsi. R, G. 



Melichthys bispinosus. R, C. 



Xesurus laticlavius. R, C, G. 



These may be termed Eastern Pacific Insular species. Two 

 of them, Pomacentrus leucorus and Xesurus laticlavius, may 

 be regarded as diagnostic of the islands as a group. They are 

 known from all the islands except Clipperton, but the Clipperton 

 fishes are too little known to be here considered. Lutianus 

 viridis, although occurring at all the islands, is known also from 

 the Tres Marias Islands near the coast of Mexico and is, there- 

 fore, likely to be taken also along the mainland shore. 



Amia atradorsata and Pomacentrus arcifrons are represented 

 at the Revillagigedo Archipelago by the related species Amia 

 atricauda and Pomacentrus redemptus. 



