486 Mr. C. T. Regan on the British and 



of pelvic fin, 19 to 22 round the caudal peduncle. Dorsal fin 

 with 9 to 11 branched rays, its origin nearer to end of snout 

 than to base of caudal fin ; longest ray about q the length of 

 head. Anal with 8 to 1L branched rays. Pectoral extending 

 about ^ the distance from its base to that of the pelvics, 

 which are inserted below or a little in advance of the middle 

 of the dorsal. Caudal peduncle 1^ to 2\ as long as deep, its 

 h ast depth from less than £ to nearly ?- the length of head. 

 Silvery, back darker ; dorsal and caudal blackish ; pelvics 

 and anal usually blackish, except at the base ; pectoral 

 usually blackish at the tip. 



Lough Neagh, Ulster, Ireland. 



Thirty-five examples, 180 to 2G0 mm. in total length. 



Dr. Scharff has kindly sent me on loan a specimen taken 

 in the Estuary of the Foyle, which had no doubt gone down 

 the Bann from Lough Neagh, perhaps during a flood. 



Subsp. a. Coregonus altior, subsp. n. 

 The Lough Erne Pollan. 



Depth of body 3^ to 4 in the length, length of head il 

 to 5. Snout as long as or longer than eye, the diameter of 

 which is 4^ to 5§ in the length of head ; interorbital width 3 

 to 3^ in the length of head. Jaws equal anteriorly ; maxil- 

 lary extending to below anterior \ or anterior ^ of eye, its 

 length from a little more than ^ to a little less than ^ the 

 length of head. 24 to 26 gill-rakers on the lower part of the 

 anterior arch. 74 to 88 scales in a longitudinal series, 9 or 10 

 in a transverse series from origin of dorsal fin to lateral line, 

 8| to 10 between lateral line and base of pelvic fin, 21 to 24 

 round the caudal peduncle. Dorsal with 9 or 10 branched 

 rays, its origin usually nearer to end of snout than to base of 

 caudal ; longest ray about f the length of head. Anal with 

 8 to 10 branched rays. Pectoral extending about \ of the 

 distance from its base to that of the pelvics, which are inserted 

 below the middle of the dorsal. Caudal peduncle 1^ to 1§ 

 as long as deep, its least depth from a little more than ^ to a 

 little less than \ the length of head. Coloration as in 

 C. pollan. 



Lough Erne, Fermanagh, Ireland. 



Fourteen spirit-specimens, 230 to 330 mm. in total length, 

 presented during the last three years by Major H. Trevelyan, 

 and two skins from Thompson's collection, received on loan 

 from the Belfast Museum. 



