92 GENERA AND SPECIES. 



lateral line there are from 66 to 70 scales. The mouth extends 

 to the middle of the eye, the lower jaw being conspicuously 

 longer than the upper. It also is a lake fish, keeping to the bottom 

 in the heat of the day when the weather is warm. It is found in 

 Derwentwater and Bassenthwaite in the English lake district, but is 

 better known as a native of the Castle Loch and Mill Loch at 

 Lochmaben, in Dumfries. In colour it is silvery, with a greenish 

 blue back and dark fins, and in length is about 9 inches. 



The Pollan has 13 or 14 rays in its first dorsal, the second 

 dorsal being adipose ; in its anal are from 12 to 14 rays, in its 

 caudal 23 ; its pectorals have 15 or 16, and its ventrals n or 12. 

 The second dorsal is over the middle of the anal, and the first 

 is midway between the hinder edge of the anal and the snout ; 

 the ventrals are below the hinder half of the first dorsal. There 

 are from 80 to 88 scales in the lateral line, and 9 between it and 

 the base of the ventrals. The mouth extends to the first third of 

 the eye, and the jaws are equal, the outline of the head being 

 easy and graceful. In colour the Pollan is silvery, with a bluish 

 back and dark fins, and it is about 13 inches long. It is an Irish 

 lake fish, best known as living in Lough Neagh and Lough Erne. 



Coris. Plate xiv. LABRID1E. 



113. julis, RAINBOW WRASSE. 



This species has a long dorsal with 9 spines and 12 or 13 rays ; 

 the anal has 3 spines and n or 12 rays ; the caudal has 13 or 14; 

 the pectorals have 12 or 13 ; and the ventrals have a spine and 5 

 rays. The dorsal begins over a spot on the hinder angle of the gill 

 cover, and in the male the 3 first spines are long, the others being 

 shorter than the rays ; while in the female the spines are all the same 

 height, which is very little less than that of the rays. In the lateral 

 line, which follows the curve of the back, there are from 75 to 80 

 scales. The mouth extends to the hinder nostril, the snout being 

 longer in the males than in the females, and in both there are four 

 long teeth in front of each jaw, and a canine at the angle. The 

 colours vary, but are generally purplish above and silvery below, 

 with always a more or less indented whitish stripe along the side. 

 The male has a spot between the longer spines. In the female the 

 side stripe is not indented. In length this handsome wrasse is about 

 7 inches. It lives among rocks, in fairly deep water, and feeds on 

 molluscs and crustaceans. 



Coryphsenoides. Plate xix . MA CR URID& . 



148. rupestris, Body tapering from the large head to the pointed tail, 

 This is a silvery deep-water fish, about 10 inches long, of which 

 only one or two specimens have been dredged up between the 

 Faeroes and Shetlands. 



Cottus. Plate vii. COTTWM. 



*i quadricornus, FOUR-HORNED COTTUS. Four short horns on top of 

 head. 



