432 PISCES (OSSEI) MALACOPT. [CORKGONUS. 



This species is found in Bala Lake, Merionethshire, as well as in the 

 North of England and Scotland. I do not feel certain that it is identical 

 with the C. Lavaretus of continental authors (synonymous with the 

 Salmo Wartmanni of Bloch), there being several other allied species, the 

 characters of which have not as yet been determined with precision. 

 The above description is from specimens in the collection of W. Yarrell, 

 Esq. By Turton and some other English authors, it appears to have 

 been confounded with the Salmo Lavaretus of Bloch (S. Oxyrhinchus, 

 Linn.), a very distinct species, in which the snout is furnished with a soft 

 conical projection at its extremity extending beyond the jaws, and which 

 is not, that I am aware, a native of this country. According to Pennant, 

 the Gwiniad is a gregarious fish, and spawns in December. 



114. C. Pollan, Thomps. (Pollan.) 



C. Pollan, Thomps. in Proceed, of ZooL Soc. June 9, 1835. 



LENGTH. From ten to twelve inches. THOMPS. 



DESCRIPT. (Form.) " Differs from the Gwiniad in the snout not 

 being produced; in the scales of the lateral line; in having fewer rays 

 in the anal fin, and in its position being rather more distant from the tail ; 

 in the dorsal, anal, and caudal fins, being of less dimensions ; and in the 

 third ray of the pectoral fin being longest ; (the first being of the greatest 

 length in the Gwiniad.) Relative length of the head to that of the body 

 as one to about three and a half: depth of the body equal to the length 

 of the head: jaws equal; both occasionally furnished with a few delicate 

 teeth ; the tongue with many teeth : lateral line sloping downwards for a 

 short way from the opercle, and thence passing straight to the tail : nine 

 rows of scales from the dorsal fin to the lateral line, and the same number 

 thence to the ventral fin ; the row of scales on the back and that of the 

 lateral line not reckoned : the third ray of the pectoral fin longest : 



B. 9; D. 14; A. 13; C. 19; P. 16; V. 12. 



Number of vertebrae fifty-nine. (Colours.) Colour to the lateral line dark 

 blue ; thence to the belly silvery : dorsal, anal, and caudal fins, towards 

 the extremity tinged with black ; pectoral and ventral fins of crystalline 

 transparency, excepting at their extremities, which are faintly dotted 

 with black: irides silvery; pupil black." THOMPS. 



The above description is that of a species of Coregonus, lately brought 

 under the notice of the Zoological Society by Mr. W. Thompson of 

 Belfast, who considers it distinct from those hitherto published by 

 authors. It is found in Lough Neagh in Ireland, in which district it 

 is said to be known by the name of Pollan. Not having given it myself 

 a close examination, I forbear offering any opinion about it. Judging, 

 however, from the description, it certainly appears different from the last 

 species, with which it was probably confounded by Fleming, who gives 

 Lough Neagh as a locality for the C. Lavaretus. 



115. C. Marcenula, Jard. (Vendace.) Lower jaw- 

 longest, obliquely ascending. 



C. Marsenula, Jard. in Edinb. Journ. of Nat. and Geog. Set. vol. in. 

 p. 4. pi. 1. Salmo Maramula, Block, Ichth. pi. 28. f. 3.? Gmel. 

 Linn. torn. i. part iii. p. 1381.? S. albula, Stew. El of Nat. Hist. 

 vol. i. p. 373. La Vemme, Cuv. Reg. An. torn. n. p. 307.? 



