Irish Fishes of the Genus Corego.ius. 483 



Powan (C. chipeoides, Lacep.), and have compared with them 

 a good series of the Schelly of Ullswater and Haweswater, 

 which is very similar, but differs at least in having more 

 scales round the caudal peduncle (22 to 24 instead of 20 or 21), 

 whilst the head and interorbital region are somewhat 

 broader ; the presence of small blackish spots on the sides, 

 which are very variable, sometimes extending all over the 

 head and body and on to the vertical fins, suggest the new 

 subspecific name stigmaticus for this form. The Gwyniadof 

 Bala Lake (C. pennantii, Val.) is a better defined race ; when 

 compared with Powan or Schelly of the same size the eye is 

 seen to be rather larger, and consequently the maxillary 

 extends a little beyond instead of to the vertical from the 

 anterior edge of the eye, except in one very large specimen 

 (400 mm.) ; the scales in a transverse series are usually more 

 numerous, the anal fin usually longer, and the interorbital 

 region somewhat narrower than in the Powan or the Schelly. 



Synopsis of the Species and Subspecies. 



I. Lower jaw projecting. 



Depth of body 3§ to 4J in the length ; caudal peduncle 

 1 to 1^ as long as deep. Dorsal fin with 7 to 9 

 branched rays, the longest from f to as long as 

 the head ; pectoral extending f to f of the dis- 

 tance from its base to that of the pel vies 1. vandesius. 



Depth of body 4 to 5 in the length ; caudal peduncle 

 \\ to 2 as long as deep. Dorsal fin with 8 to 10 

 branched rays, the longest f to f the length of 

 head ; pectoral extending \ to nearly f of the dis- 

 tance from its base to that of the pelvics la. gracilior, 



II. Jaws equal anteriorly. 



Depth of body 3| to 4i in the length ; maxillary ex- 

 tending to below anterior ^ of eye or beyond, its 

 length f to J of the length of head ; 1\ to 9 scales 

 between lateral line and base of pelvic fin, 19 to 

 22 round the caudal peduncle 2. pollan. 



Depth of body 3^ to 4 in the length ; maxillary ex- 

 tending to below anterior \ or anterior f of eye, 

 its length from a little more than \ to a little less 

 tli an I of the length of head ; 8^ to 10 scales 

 between lateral line and base of pelvic fin, 21 to 

 24 round the caudal peduncle 2 a. alitor. 



Depth of body 3f to 4| in the length; maxillary ex- 

 tending to below anterior J of eye, its length J to 

 | the length of head ; 8 to 10 scales between 

 lateral line and base of pelvic fin, 22 to 2G round 

 the caudal peduncle 2 b. elegans. 



