LEUCISCUS IDUS. 



139 



Lenciscus idus (Lin.). — The Ide. 



The tish is known in Sweden as the Id ; in Germany it is the Nerfiing ; 

 in Prussia, the Aland . It is the Gd)<e in Silesia, Bratfiseh in some parts of 

 Hungary, and the Gangling in Austria. It is placed by Heckel in a distinct 

 g-enus, named Idus, and in this sub-division of Lenciscus he is followed by 

 nearly all the Continental writers. The larger grouping of Dr. Giinther, 



DUS (HXN.T'IUS). 



however, preserves the species in association with its allies, the Roach, Chub, 

 Dace, Rudd, and Minnow (Fig. 68). 



The body is moderately elongated and compressed ; its height is one- 

 quarter of the length of the fish. The length of the head is only one- 

 sixth of the total length ; the greatest thickness is less than half the height. 



The eye is less than one-quarter of 

 the length of the head ; it is separated 

 from the other eye by twice its own 

 diameter in the mature fish, and sepa- 

 rated from the snout by a single dia- 

 meter. The forehead widens with age. 

 The mouth is small ; the jaws are equal 

 in length, and the angle of the mouth 

 reaches only to the nares. The mucus 

 membrane forms numerous folds on 



the throat, and they are covered with delicate papilla', some of which put on the 

 appearance of teeth. The pharyngeal teeth (Fig. 69) have the formula 5-3 — 

 3-5. The dorsal profile is moderately and evenly arched, with a depression 

 at the hinder part of the head ; the ventral outline is similar. 



AHVNGEAL TEETH OF LErCISCUg 

 IDUI?. 



