THE SALMON TRIBE 



2881 



ern Europe, shown in the upper figure of the illustration. Pollan, which grow to 

 a length of about six inches, are largely sold in Belfast during the spawning season, 

 at which time they come up from the deep waters of Lough Neagh to the shallows. 

 At times they occur in enormous numbers upward of seventeen thousand having 

 been taken on one occasion in the early part of the last century. 



The last of the salmonoids that we have space to notice are the 



grayling, of which the European species ( Thymallus vulgaris) is 



shown in the upper figure of the illustration on p. 2877. Nearly allied to the core- 



gonoids, the grayling are readily distinguished by the greater height and length of 



PYGMY MARANE AND MARANE 



(One-fifth natural size.) 



the dorsal fin, which includes from thirteen to twenty-three rays. The cleft of the 

 mouth is also smaller, and the maxilla of small size. Small teeth are present in the 

 jawbones, as well as on the palatines and the head of the vomer, but they are want- 

 ing on the tongue. The blind appendages of the intestine are less numerous than 

 in either the salmon or the coregonoids, and the air bladder is unusually large. 

 The range of the genus includes a large portion of Europe, Northern Asia, and the 

 colder regions of North America. The common species is found locally over a great 

 part of Europe, ranging from Lapland to Venice, and from England to Russia. It 

 is, however, unknown in Ireland, and has only been introduced of late years into 

 Scotland; while in England it is most abundant in the rivers flowing from the lime- 

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