270 BULLETIN OF THE BUREAU OF FISHERIES. 
While the original descriptions of both Chetodon cornutus and C. canescens are unsatisfactory, the 
two species are figured both by Klein and by Bonnaterre in such a manner as to leave little doubt 
of their specific distinctness. Doctor Bleeker had specimens of the short-nosed form called by himself 
and by Bonnaterre canescens, and differing further from the common ‘‘ Moorish Idol’’ in the absence of 
the triangular black marking on the side of the nose. The short-nosed form recently described from 
Hawaii by Bryan, and named by him Zanclus ruthix, is almost certainly not different from the Zanclus 
canescens of Bleeker and the Chetodon canescens of Bonnaterre and Linnzus, 
Family HEPATID.” 
HEPATUS Gronow. 
215. Hepatus olivaceus (Bloch & Schneider). Indangan. 
Of this species we have one well-preserved example from Cagayancillo, 3.50 inches long, plainly 
showing the pale bar aboye the pectoral, the length of the bar being about two-thirds that of the fin. 
The caudal lobes are very little prolonged, the specimen agreeing in that respect with examples (3 to 6 
inches long) from Samoa. The figure of Teuthis olivaceus published by Jordan & Evermann was taken 
from a Formosan specimen 13 inches long, and has the caudal lobes greatly prolonged and the humeral 
bar reaching tip of pectoral. It is probably not, however, different. We note, in this connection, the 
occurrence in specimens of Hepatus nigricans from Pago Pago, Samoa, taken at the same time and place, 
about the same amount of difference in the prolongation of the caudal lobes between young and older 
specimens. 
Life colors of the specimen from Cagayancillo: General color dark brown; humeral bar a narrow basal 
portion of dorsal mottled with gray; short rays of caudal tipped with white, the pale portion forming a 
conspicuous white crescent. 
Two smaller specimens from Cagayancillo, 2.75 inches long, appear to be this species, but do not 
show the humeral bar. Their life color is described by Mr. McGregor as “bright yellow, speckled with 
brown; top of head and edges of dorsal, anal, and ventral darker.”” This description of the life colors 
corresponds well with that of Samoan specimens, except for the absence of mention of the humeral bar. 
Tt is not impossible that this may be indistinct in young individuals, or that these two examples were 
faded at the time of writing. 
216. Hepatus elongatus (Cuvier & Valenciennes). 
Two examples, 2.50 and 2.75 inches long, from Cagayancillo. 
217. Hepatus lineatus (Gmelin). Saguing saguing. 
A young specimen from Cagayancillo, 2.50 inches long. In life striped from mouth backward over 
whole body with colors in this order: Blue, black, yellow, black, blue; caudal peduncle vertically 
marked by two blue, one yellow, and four black lines; caudal with a blue crescent; dorsal yellow, with 
two blue lines, posteriorly dusky; pectoral clear; ventral orange black outwardly, edged with blue; 
anal yellow, with a greenish black line at base and with a blue edge; belly pale dirty blue. 
218. Hepatus matoides (Cuvier & Valenciennes). 
A specimen, 3.75 inches long, from Calayan, and two smaller ones, 1.50 to 2.25 inches long, from 
Aparri. 
219. Hepatus triostegus (Linnus). Culaban. 
A specimen, 4 inches long, from Cagayancillo, and one of the same size from Fuga Island. A small 
example, 2.75 inches long, from Calayan Island. 
ZEBRASOMA Swainson. 
220. Zebrasoma rhombeum (Kittlitz). Catol catol. 
One example, 3 inches long, from Cagayancillo. Life colors: Dark seal brown, darker posteriorly; 
dorsal, caudal, and anal black; sides of face and body finely dotted with blue, the dots joined in short 
lines on side of body. 
aUnder the rules of the International Code of Zoological Nomenclature the name Monoceros, Bloch & Schneider, must 
be used for Chztodon wnicornis in place of Acanthurus or Naso. Teuthis was, however, first restricted by Cuvier as a syn- 
onym of Acanthurus=Hepatus Gronow. 
