GIVYNIAD. 



153 



few months' time. Sir Humphry Davy {Salmonia, p. 188) goes so far as to believe that 

 Grayling hatched in May and June become in September or October of the same year nine 

 or ten inches long, and to weigh from five ounces to half a pound. This I feel sure is a 

 mistake. Such fish would surely be quite a year old. Grayling ova as well as fry may, I 

 believe, be had from J\Ir. Parnaby, of Troutdale Fishery, Keswick, in the season. 

 The fin-ray formula in the Grayling is 



Dorsal 20- 23. 

 Pectoral 16. 

 Ventral 10 — 1 1 . 

 Anal 13 — 16. 



The specimen which supplied the illustration was caught by myself with a fly in the 

 Severn ; it is a male fish. 



Order IV. 

 PHFSOSTOMT. 



FaTnilv 



SALMONIDJE. 



Sub-generic Group — Salvelini. 



jWYNIAD. 



fCorcgon us clupcoidts.) 



Guiniad Wallis, piscis lacus Ba/t iisis, 

 Q-iVyniad Salmon, 

 Coregonus clupeoides, 

 Coregonus lacepcdci, 



Coregonus lavareius, 

 Gwyniad, Schelly (UllnvaterJ, 

 Guiniad, 



WiLLUGHBY, Hist. Pise. p. 1 83. 



Pennant, Brit. Zool. iv. p. 41V. ed. 1812, pi. 73. 



Lacep., v. p. 6g8; GUnther's Cat. vi. p. 188. 



Parnell, Ann. and Mag. Nat. Hist. 1838, i. p. 162; Yarrell, ii. 



p. 151: Couch, Fish. Brit. Isl. iv. p. 295, pi. 232. 

 Flem., Brit. An. p. 182; Jenyns' Man. p. 43'- 

 Yarrell, ii. p. 142. 

 Couch, Fish. Brit. Isl. iv. p. 286, pi. 229. 



Characters of the Genus Coregonus.— "Body covered with scales of moderate size. Cleft of the mouth small; 

 maxillary broad, short or of moderate length, not extending behind the orbit. Teeth, if present, extremely minute, 

 and deciduous. Dorsal fin of moderate length: caudal deeply forked. Pseudobranchise well developed; air-bladder 

 very large. Stomach horse-shoe-sliaped ; pyloric appendages e.xtremcly numerous. Ova small." — GUnther. 



THE fishes belonging to the genus Coregonus are inhabitants of the northern parts of 

 temperate Europe, Asia, and North America. The three British species are found only 

 in lakes, but there are many foreign kinds which periodically ascend from the sea, especially 

 from the Arctic Ocean. 



According to Dr. Giinther the species of this genus are not less numerous than those 

 of Salmo, some having a very extended geographical range, whilst others are confined to 

 very limited localities. They are less subject to variation than the Trout, and therefore more 

 easily characterized and distinguished. "Hence we find that naturalists who look with distrust 

 on the different species of Sa/mo are quite ready to admit those of Coregonus. The characters 



