436 Mr. C. T. Regan on 



3 to 5 dermal lobes above the upper lip and 4 or 5 near tlie 

 angle of the mouth. Tlie pectoral fin is shorter than in 

 O.japonicus and the coloration is different. 



Cestracion amhoinensis. 



Heterodunt'is zehra (non Gray), Bleek. Act. Soc. Sc. Neerland. i. 1856, 



Amboj'na, p. 71. 

 Cestracion FhUUppi (part.), Giiath. Cat. Fish. viii. p. 415 (1870). 



Lateral teeth, in the adultj much enlarged, without kf-els ; 

 anterior teeth, in the adult, obtuse, unicuspid ; symphysis of 

 the jaws elongate. Supraorbital ridges low, terminating in 

 advance of the first gill-opening, which is about twice as long 

 as the last or as long as its distance from the fourth. Origin of 

 first dorsal above posterior end of base of pectoral; anterior edge 

 of fin rather stronglj' convex, free edge rather deeply emargi- 

 iiate; length of base ^ the height of the fin (in the adult) ; 

 exposed part of spine \ its length, which is i the height of tlie 

 fin. Second dorsal a little nearer to caudal than to first dorsal, 

 its base 4, its height | that of the first. Anal, when laid back, 

 not reaching the caudal. Pectoral extending a little beyond 

 the origin of ventral ; ventral nearly reaching to below the 

 second dorsal. Yellowish, witli alternate paired and unpaired 

 dark brown bars across the back and sides, each of wiiich is 

 more or less completely split into two ; the j)aired bars are 

 interorbital, postovbital^ in front of and behind each of the 

 dorsals and in front of the caudal ; anterior and posterior 

 edges of eye corresponding to anterior and posterior edges of 

 the pair of interorbital cro3.«-bars. 



llah. Amboyna. 



A single specimen of 580 mm. from Dr. Bleeker's collection. 



The Chinese C. z-hra has the dor.-*al fins less elevated and 

 the dark cross-bars broader and separated by narrower inter- 

 spaces, and with less tendency of eacii bar to s[)lit into two. 



Centroscymnus macracanthus. 



Dermal denticles each with 3 parallel keels ending in a 

 point posteriorly, the middle the strongest. Distance from 

 mouth to end of snout equal to the distance from eye to first 

 gill-opening; nostrils very oblique; length of anterior labial 

 fold about equal to its distance from the symphysis. Ante- 

 rior dorsal fin shorter than second, the length of its base 

 (without the spine) | of its height and § of its distance from 

 the second ; length of base of second (without the spine) § 

 of its distance from upper caudal lobe ; spines well developed 

 and strongly projecting. Pectoral extending to the vertical 



