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



III. Lower jaw included within the upper. 



A. Snout vertically truncated. 



Anal fin with 9 to 11 branched rays; 1\ to 8| scales 



between lateral line and base of pelvic fin, 20 or 21 



round the caudal peduncle ; interorbital width 2>\ 



to 3f in the length ot'head 3. clupeoides. 



Anal fin with 10 to 12 branched rays ; 7 to S\ scales 



between lateral line and base of pelvic fin, 22 t.> 



24 round the caudal peduncle ; interorbital width 



3 to 3j in tin' length of head 3 a. stiymaticus. 



Anal fin with 1 1 to 13 brancbed rays ; 8 to 10 (usually 9) 



scales between lateral line and base of pelvic fin, 



22 to 24 round the caudal peduncle ; interorbital 



width 3^ to 3| in the length of head 3 6. pennantu. 



B. Snout produced, conical 4. oxyrhynchus. 



1. Coregonus vandesius, Richards. 

 The Vexdace. 



Coregvnus vandestus, Giinth. Cat. Fish. vi. p. 194 (I860) ; Day, Fish. 

 Britain, ii. p. 128, pi. cxxiii. fig. 1 (1884); Regan, Ann. & Mag. 

 Nat. Hist. (7)xvii. 1906, p. 180. 



Depth of body 3§ to 4{ in the length, length of head 4 \ 

 to 4§. Snout shorter than eye, the diameter of which is 3i 

 to 0*4 in the length of head ; interorbital width 3£ to 4 in the 

 length of head. Lower jaw projecting; maxillary extending 

 to below anterior \ of eye, its length about \ the length of 

 head. 26 to 30 gill-rakers on the lower part of the anterior 

 arch. 63 to 72 scales in a longitudinal series, 7£ to 9 in a 

 transverse series from origin of dorsal fin to lateral line, 6 or 

 7 between lateral line and base of pelvic fin, 20 to 22 round 

 the caudal peduncle. Dorsal with 7 to 9 branched rays ; 

 origin nearly equidistant from end of snout and base of 

 caudal fin ; longest ray from f to as long as the head. Anal 

 with 9 to 12 branched rays. Pectoral extending § to f of 

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

 below or a little behind the origin of the dorsal. Caudal 

 peduncle 1 to 1^ as long as deep, its least depth § or a little 

 more than § the length of head. Silvery or golden, back 

 greenish blue; fins pale or dusky. 



Castle Loch and Mill Loch, Lochmaben, Dumfriesshire. 



Seventeen examples, measuring up to 195 mm. in total 

 length ; only two of these have 9 branched rays in the dorsal 

 fin. 



