. British and Irish Salmonidæ. er of speciesamong this family has been unduly augmented, and varieties have been accordedspecific rank : while every little variety of form, colom-, or structure has alsobeen reckoned as possibly demonstrating hybridity. The proportions of different parts of the body vary with age, season, orlocality,* and this may be augmented in some anadromous forms which havebeen subjected to unnatural retention in fresh water, insufficiency of food, from any cause. The head of the male is generally longer than that ofthe female, especially in old examples, but t
. British and Irish Salmonidæ. er of speciesamong this family has been unduly augmented, and varieties have been accordedspecific rank : while every little variety of form, colom-, or structure has alsobeen reckoned as possibly demonstrating hybridity. The proportions of different parts of the body vary with age, season, orlocality,* and this may be augmented in some anadromous forms which havebeen subjected to unnatural retention in fresh water, insufficiency of food, from any cause. The head of the male is generally longer than that ofthe female, especially in old examples, but these firoportions are liable to variationshould the example be barren. * Young Lochleven trout, raised by Mr. Andrews of Guildford, from eggs sent from Howietoun,are found to grow more rapidly in their southern home, become deeper in form, while tlie coloursare not very far removed from those of the local brook trout: and other as remarkable deviationsfrom the original type will be alluded to when this local race is Olt KETTLH NET, SYNOPSIS OF BRITISH GENERA. Synopsis of British Genera. » 1. Salmo.—Maxillary long : deutition strong and complete. Scales rays in moderate numbers (14 or less). Pyloric appendages numerous. 2. Thi/mallus.—Maxillary short: small teeth in the jaws, vomer, and on thepalatine bones. Anterior dorsal fin many rayed. Scales of moderate appendages numerous. .3. Goregonus.—Maxillary short: teeth if present minute. Anterior dorsal finwith few rays. Scales of moderate size. Pyloric appendages numerous. 4. Osmerus.—Maxillary long : dentition complete, with fang-like teeth on thevomer and tongue. Scales of medium size. Pyloric appendages few. 5. Argentina.—Maxillary short: teeth absent from jaws. Anterior dorsal finwith few rays. Scales rather large. Pyloric appendages few or in moderatenumbers. Of the foregoing my rem^arks will be restricted to species belonging to the twofirst genera, or those of Salmo and
Size: 2059px × 1213px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookidbritishirish, bookyear1887
