BY ROBERT HALL, C.M.Z.S. 81 



If the young shows a comparatively large amount of 

 cream between the bars of the posterior third of the 

 fish this stage will develop into the light phase. 



If the young is deep violet-brown, with its bars just 

 visible, it will develop into the dark phase. 



Judging by b, which is an intermediate phase, it will 

 eventually evolve into the light phase d. 



Thus the species would appear to be dimorphic up 

 to maturity, when both phases a and b pass into d, 

 the phase of total loss of pigment. 



Of the sixty specimens, there appear to be only half a 

 dozen fully adult (four inches in length) of which four are 

 losing or have lost their pigment. 



Of twelve more carefully examined the dorsal fin in 

 ten is xii. : xviii. ; in one it is xii. : xvii ; in another it 

 is xii. : xix. ; while the anal fin showed ii. : xx. in nine, 

 xnd ii. : xix. in three. 



Specimen "e" appeals to me as not being normal. It has 

 its first and second dorsals so distinctly severed and wide 

 apart (0.25 inch) that 1 conclude it must have met with an 

 accident in the early part of its life. The last ray of the 

 first dorsal and the first ray of the second dorsal are so 

 opposed to each other as to form an aiigle of 70 degrees. 



Of the sixtv specimens examined all, excepting this 

 one, have the dorsals fully united in the usual way with a 

 lessening in length of 2-3 rays in order to form the slight 

 depression that makes a division between the two dorsals. 



This particular specimen belongs to the pale phase, 

 with seven thumb-like lateral marks to indicate the obso- 

 lete broad bars of the trunk. 



2. Clinus perspicillatus, Cuv. and Val. — In the key 

 to this species we find that Mr. A. !R. McCulloch* marks the 

 anal fin as II. : 24-26, figuring it in Plate xi. 



This is how Richardson illustrates his type ** show- 

 ing the two anal spines as being less than one-third of the 



♦Austr. Mu8. Catal., Vol. VII., No. 1 (iy08). 

 **Trans. Zool. Soc, Vol. III., pi. 6, fig. 2 (1849). 



