314 THE PROCEEDINGS OF THE LINNEAN SOCIETY 



jaws are all acutely trilobed (the middle cusp largest), even those 

 that have fulfilled their duty outside the jaw remain tolerably 

 acute, while the side teeth are very elongate, with an elevated 

 ridge along the entire length, grooved or fluted on the outer side. 

 The supra-orbital ridges are short, much elevated, bend outwards 

 over the eye, approach towards the front, and terminate abruptly 

 behind. The first gill opening is three times the length of the fifth. 

 The spiracle is a little more distant from the eye, and slightly more 

 advanced than in H. PhilUpi. The first dorsal fin commences 

 rather behind the vertical from the root of the pectorals. The 

 second dorsal commences behind the ventral, and reaches almost 

 to the vertical from the commencement of the caudal. The spines 

 are two-thirds the length of the fins, and the fins themselves are 

 relatively of the same size as in IT. FMllipi, but are pointed and 

 falcate on the summit. The antero-inferior lobe of the caudal 

 fin is large, vertically truncate behind, and separated from the 

 posterior lobe (which is smaller and triangular) by an acute 

 angle ; the extremity is truncate. The anal fin reaches nearly 

 to the commencement of the caudal. The other fins are large 

 and shaped as in S. PhilUpi. 



The colour in the dried specimen before me is a dull pale brown 

 on the upper parts, and a brownish white beneath. The top of 

 the head and supra-orbital ridges from the level of the eyes back- 

 wards are black ; the black patch extends backwards to near the 

 first dorsal fin, and downwards a little, though more faintly, on 

 the cheek ; there are also some faint broad black cross-bars along 

 the whole length of the back. A light-coloured lateral line 

 seems to divide the darker upper from the lighter under portion, 

 as in H. PMllipi. 



It is probable that the colour in the fresh specimens would be 

 a sericeous reddish -brown with the black marks much more 

 clearly defined. 



To judge by the number of specimens known of this fish it 

 might be pronounced extremely rare. The first recorded is by 

 Dr. Gunther (Cat. Brit. Mus. vol. 8, p. 416), and all he says of 

 it, in addition to a short specific description, is that it is a female, 

 25 inches long, presented by Dr. G. Bennett, from Australia. 



