C. Pollan, Thomps. in Proceed, of Zool. Snc. June 9, 1835.
From ten to twelve inches. Thomps.
(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.