588 Mr. F, Pickard-Cambridge on the 
caught examples are beautifully mottled with various markings 
of different shades of grey, thus closely assimilating with the 
rocks and gravel of the pools which they frequent. 
In preserved examples the beautiful gradations of colour 
vanish and the markings become more distinctly differentiated. 
All the fins except the ventral are pale, with more or less 
irregular rows of transverse, chevron-like, sooty-black 
blotches. The caudal fin has four or five irregular transverse 
bars of chevron-like sooty-black blotches ; in the anal fin the 
blotches are very pale. The ventral fin is pale in some 
examples, more sooty in others, when it is seen to be 
minutely speckled with black. Pectoral fins with a dark 
basal suffusion and transverse bands, more or less regular, of 
chevron-like dark blotches. 
The head is dark sooty black above, the cheeks and oper- 
culum being richly blotched with black. The dorsal area is 
deeply suffused with black blotches, which extend irregularly 
down the sides and across the lateral line, terminating along 
the belly in a row of distinct irregular blotches from the 
pectoral fin to the tail. ‘The central lateral area of the caudal 
peduncle is marked with three elongate, wedge-shaped, black 
blotches. Ventral area sometimes pale, often sooty, when it 
becomes minutely speckled with black. 
This species may be distinguished from G. niger, (1) by the 
free lateral lobe on the anterior membrane of the ventral fin, 
(2) by the smaller size of the scales, (3) by the greater width 
between the eyes, and (4) by the median rays of the first 
dorsal not being prolonged; from G. paganellus, (1) by the 
absence of the yellow band on the margin of the first dorsal, 
(2) by the lateral free lobe of the ventral fin, and (3) by the 
more numerous scales in longitudinal and transverse series. 
The following represent the measurements of four examples 
of this species :— 
_—— ae 
Be (\9) | Saavee 21 15) |) 251 ee 
VI 23 15) | Ae aes 
251 17 sew a 17 15 | 12} 65 
co (ep) “I “I | 
‘ ivy) 
ie.) 
ho 
nse 
200 1E 1 evil 13 LO Zale 
Fin-rays. Scales. = | 
ih Ge 
Nice =S ag 
Ist D. Ath Ray.| 2nd D.| An.| Long. | Trans. 
15 
15 
15 
16 
