ß50 Frits Johansen. 



having disappeared. In the larger specimens there is a marked 

 sexual difference in the height of D^ and length of V: 



ri2mni 

 111 — 



mm v^^^ ™^^ ^^ ^ °^ ^^^ "^"^ 



1 20 — - ? - 125 — 



At a length of 25 mm the preopercular spines are apparent, 

 but the uppermost is not yet bifurcated; at 36 mm it is divided 

 into two branches and at 68 mm there is an indication of a 3rd 

 division. Among the larger specimens this spine has 2 — 3 branches 

 in a Ç of 140 mm, but 3 — 4 in a Ç of 125 mm and cf of 105 mm. 

 From a length of 68 mm onwards the upper side of the head has 

 a number of roughnesses but no spines. 



Regarding the colour of the living specimens I have the follow- 

 ing observations (along with my coloured sketches). 



Ca. 25 mm (PI. XLVI, fig. 6). The belly and the anal and ventral 

 fins are whitish ; the head and back as also the sides have a grayish 

 brown tone, with a large, dark-blue spot on the occipital region as 

 also on the abdominal region behind the pectorals. Larger and 

 smaller spots are also present under the two dorsal fins and there 

 is especially a characteristic, lozenge-shaped marking (varying in 

 form and extent) of dark-brown pigment from above the anus to 

 the caudal fin (the beginning of the later so characteristic, festooned 

 marking on the caudal region below the lateral line). The pectorals 

 have pigment only on the base and the unpaired fins weaker pig- 

 mentation, which is also present behind the eye and between the 

 occipital spot and the first dorsal. 



Ca. 35mm (PI. XLVI, fig. 7). The later so characteristic festooned 

 marking on the caudal region is now almost fully developed, 

 the spots having fused together. Owing to the very dark-brown 

 pigment dots on the dorsal region (the grayish-brown tone of the 

 younger specimens) the occipital and abdominal spots and the spots 

 under the two dorsal fins are less apparent than in the younger 

 specimens (but are to be seen); the pigment under the eye has now^ 

 collected into a larger spot. The most characteristic thing now, 

 however, is the appearance of dark-brown cross-bands on the 

 2 dorsal fins, the caudal and pectoral fins, w^hich later 

 distinguish this fish. The belly is a lightish-yellow as also the anal 

 and ventral fins. 



Ca. 68 mm (PI. XLV, fig. 9). This stage is difi'erent from the 

 foregoing by the belly being more silvery (as also A and V); the 

 cross-bands on the other fins are now more distinct and broad 

 (especially on P and C). Of the large spots on the dorsal region 

 only those under D^ and on the caudal peduncle are now distinct, 

 owing to the spreading of the brown ground-colour; but the caudal 



