230 Mr. C. T. Regan — .1 Preliminary 



Hah. Lough Finn in Donegal. 



A single specimen (<$), 205 mm. in total length. 



This species is closely allied to S. colli, differing in the 

 longer head, produced pointed snout, strong teeth, <fcc. 



I have named it after the donor, Major H. Trevelyan, to 

 whom the British Museum is also indebted for a fine series 

 of the fishes of Lough Erne. 



3. Salvelinus colli. 



Salmo colii, Gunth. Proc. Zool. Soc. 1863, p. 12, pi. Li., and Cat. Fish, 

 vi. p. 138 (1866); Day, Fish. Britain, p. 114, pl.cxviii. fig. 2 (1884). 



Depth of body 4 to 4£ in the length, length of head 41 to 

 4?. Snout subcorneal, with upper profile decurved ante- 

 riorly, as long as or a little longer than eye, the diameter of 

 which is A\ to 4| in the length of head. Interorbital region 

 slightly convex, its width 3 to 3£ in the length of head. 

 Dentiiion feeble or moderate; jaws equal anteriorly; maxil- 

 lary extending to below the posterior margin of pupil or 

 beyond, its length 2i| to 2| in the length of head ; lower jaw 

 pointed anteriorly, its length 1? to If in the length of head. 

 8 to 12 branchiostegals. 13 to 16 gill-rakers on the lower 

 part of anterior arch, the longest about § the diameter of eye. 

 138 to 168 scales in a longitudinal series. Dorsal 13-15, 

 with 9 or 10 branched rays, its origin nearer to the tip of 

 snout than the base of caudal, the longest ray \ to f the 

 length of head. Anal 11-14, with 7 to 9 branched rays. 

 Pectoral § to \ the length of head, extending from \ to 

 nearly f of the distance from its base to the base of pelvics. 

 Least depth of caudal peduncle 1^ to 2 in its length and 

 about § the length of head. 62 or 63 vertebra?. Bluish 

 black above, silvery or orange below ; sides with orange 

 spots ; fins dusky. 



Hob. Lough Eske (Eask) in Donegal. 



Here described from twelve examples, 170 to 210 mm. in 

 total length. 



Char from Lough Derg in Donegal, Lough Conn in Mayo, 

 and Loughs Mask and Inagh in Gralway are essentially 

 identical with the Lough Eske form. 



A single example (<$) from Lough Derg, 200 mm. in 

 tolal length, has all the characters of the Lough Eske char. 



Two examples (^) from Lough Conn measure 290 and 

 230 mm. in total length. In each the dorsal fin has 9 and 

 the anal 8 branched rays. There are 154 to 160 scales in a 

 longitudinal series and 13 or 14 gill-rakers on the lower part 

 of the anterior arch. 



