176 
ekstuom’s topknot. 
high ridge; the left eye in advance, and nearly touching the 
mystache; both eyes nearer the snout than in the R. hirtiis of 
Yarrell, with which the comparison was particularly made. 
The gill-covers also much less marked with ridges; anterior 
portion of the head and jaws rough with points, but less 
so than in the kindiod fish. On the cheeks and body the 
scales are regular and plainly visible, while they are not 
discerned in R. hirtus, and they are ciliated at the edge; but 
the whole surface, as well of the cheeks as the body, is 
smooth when the finger is passed over it to the tail. Lateral 
line less arched at first, by not ascending, and from the part 
where it is bent down proceeding straight to the tail. The 
dorsal fin does not begin so near the snout, but barely in 
front of the upper eye. The pectoral fin is longer and more 
pointed, for where in R. hirtvs it barely touches the angle 
of the lateral line, in this fish it reaches beyond it; ventral 
fins not quite so close to the throat, but near the anal fin, 
tail much longer. The dorsal and anal fins pass only a little 
under the body at their termination, but this termination is 
not so near the caudal as in the other species. The under 
or uncoloured side, as well of the cheeks as body, is covered 
with ciliated scales, which is not the case with Muller s 
Topknot; and these scales pass far beyond the termination of 
the dorsal and anal fins, so as to cover the origin of the rays 
of the caudal fin. On the lower side the pectoral fin is small. 
Colour of the upper surface yellowish brown, mottled with 
darker brown over the head, body, and fins, witn less tendency 
to defined spots than in the other species. 
As two other species of Topknots have obtained their 
English names from eminent naturalists who have described 
them, it appears an act of justice to apply to the third 
species the name of a naturalist to whom we are indebted 
for a correct knowledge of the fish we have now added to 
the British catalogue. 
