. British and Irish Salmonidæ. rin those of the females,while there are from oneto three teeth (unless allare absent) on or justbehind the head of thevomer *: in grilse, shouldteeth be present, thereare from one to threeon the head and one ormore in a single rowalong the body of thatbone. But the numbers are very various so soonas the fish arrives at anage to commence its mig-rations sea-wards. In theparandsmolt a double rowexists along the body of 15. on vomer of par, 7 iu. long. Fig. onvomer ofgrilse, 3Jlb. wt. the premaxillary ones beingmaxillary and palatine onesin the j
. British and Irish Salmonidæ. rin those of the females,while there are from oneto three teeth (unless allare absent) on or justbehind the head of thevomer *: in grilse, shouldteeth be present, thereare from one to threeon the head and one ormore in a single rowalong the body of thatbone. But the numbers are very various so soonas the fish arrives at anage to commence its mig-rations sea-wards. In theparandsmolt a double rowexists along the body of 15. on vomer of par, 7 iu. long. Fig. onvomer ofgrilse, 3Jlb. wt. the premaxillary ones beingmaxillary and palatine onesin the jaws of males thanthe vomer, while the hindedge of the head of thatbone is armed with threeor rarely four teeth placedin a single row : someof these commence beingshed as the par is becom-ing a smoltjt and the lossIapidly increases in thegrilse stage. As a rulethere are less teeth onthe head of the vomer ofa salmon than exists inthat of a trout of similarsize. There are three tosix recurved teeth oneither side of the tongue. J^. Fig. 17. Outlines of tail fins of salmon at various ages ;—1. Male par, 42 inches long; 2. Par, 52 inches long; par, 6-4 inches long; 4. male smolt, 7S inches long;5. Grilse, 3} lb.; 6. Grilse, 4^ lb. * July 12tli, 1886, a grilse of 3J lb. weight had two teeth on the head of the vomer and one onits body : vertebra; .59 -f- .r : one of i^ lb. had only two on the hind edge of the head of thatbone: while a large male salmon, 2G lb. weight, had one tooth on the hind portion of the head ofthe vomer and a second on the commencement of the body of that bone. t In several par seven inches long taken in September, 1886, the teeth on the body of thevomer were commencing to take on a single row in all, for out of nine sets originally of two eachonly four pairs remained, tlie rest having become single. J In June, 1883, a female salmon of 10 lb. weight had three teeth on either side of the tongue :July 21st, 1886, a female salmon 12 lb. weight had the lingu
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Keywords: ., bookcentury1800, bookdecade1880, bookidbritishirish, bookyear1887
