SHORE FISHES OF GALAPAGOS ISLANDS 4O3 



The teeth are freely movable and have each a slender peduncle and 

 a flat, expanded distal part bent almost at a right angle to the other, 

 and serrated on the outer edge ; scapula and opercle striated ; caudal 

 angles moderately produced ; ventrals with rather long, filamentous 

 terminations in the larger specimens ; three anal spines ; both the first 

 dorsal and first anal spines concealed in the skin ; anterior profile 

 blunt, steep and about straight from belovv^ eye to snout. 



133. HEPATUS TRIOSTEGUS (Linnjeus). 



Chcetodon tnostegus Linn^us, Syst. Nat., Ed. x, 274, 1758. 



Teuthis triosteo;us, Jordan & Evermann, Fishes North and Mid. Amer. , 11, 



1690, 1898. — Jordan & McGregor, Rep. U. S. Fish Comm. for 1898 



(1899), 280 (Revillagigedo Islands). 



Ra7ige. — Australasia, Polynesia, Revillagigedo and Cocos islands. 



Hitherto known in the eastern Pacific only from the Revillagigedo 

 Islands. We have 37 specimens from Cocos Island, but did not find 

 the species at the Galapagos Islands. All of the Revillagigedo and 

 Cocos specimens differ from Hawaiian specimens of the very closely 

 related Hepatus sandvicensis (Streets) in lacking the black band 

 reaching from the base of the pectoral to the base of the ventral. 

 There is a dark spot on the outer side of the base of the pectoi"al and 

 in some a similar spot below this one. 



134. HEPATUS CRESTONIS Jordan & Starks. 



Teuthis crestonis Jordan & Starks, Proc. Cal. Acad. Sci. 1895, 485, pi. 47, 

 Mazatlan. — Jordan & Evermann, Fishes North and Mid. Amer., 11, 

 1692, 1898. 



Range. — Mazatlan, Panama and Cocos Island. 

 . We have one specimen from Cocos Island 275 mm. long. 



Color in life. — Sides, head and back wood-brown, marked every- 

 where with faint wavy purplish bands ; belly grayish ; snout lighter 

 gray ; a golden band through eye to opercle ; dorsal fin yellowish 

 anteriorly, seal-brown on soft part, marked whole length with 3 to 4 

 blue bands, whole fin orange-bordered ; anal like dorsal, but bands 

 continuous and border of fin golden instead of orange ; pectoral olive, 

 whole broadly tipped with cream-color ; ventrals with membranes 

 gray, rays creamy; caudal like back, becoming black at tip. 



135. HEPATUS ALIALA (Lesson). 



Acanthurus aliala Lesson, Voyage Coquille, Zool., 11, 150, 1830, Aulan. 

 Tettthis aliala Jordan & Evermann Fishes North and Mid. Amer., 11, 1693, 



1898. — Jordan & McGregor, Rep. U. S. Fish Comm. for 1898 (1899), 



280 (Revillagigedo Islands). 



