ABI^\Mrs BJORKNA. 



At the breeding' season the colours become darker in both sexes, and the 

 fins acquire an orang-e tint, but I'atio thinks the colour may to some extent 

 dej^end upon the food. The male frequently has small tubercles developed 

 on the scales. 



The pharyng-eal bones are characteristic, being much more rounded than in 

 other Abramidina. Opposite to the anterior tooth, the outer side of the anterior 

 process is inflated. The formula, according to Von Siebold, is 3"5 — 5-3 in 

 Bavaria, and, according- to Heckel, 2*5 — 5"2 in Austria, and in Switzerland 



-5-3, and -Z-i) 



that 



Fatio finds both types as well as I'O — 5'1, 

 can only infer some variation with g-eo- 

 g-raphical distribution (Fig-. 125). 



The fish which Nordmann described 

 as Ahramis lask//r, and records as com- 

 mon in the Black Sea and rivers flow- 

 ing" into it, is a variety in which the fins 

 are more developed. 



There are twenty vertebra3 in the thorax, 

 and the same number in the tail. 



The Ahraviis laski/r of Pallas has been 

 thoug-ht worthy of recognition by many writers (Fig. 12()). Its greatest height 

 is more than one-third of the length, and the thickness is less than one-quarter of 



^1 



'HARYNGEAL TEETH OF AHRAMIS 

 (hlicca) BJOHKNA. 



the length. The forehead is smaller than in the preceding type. All the fins are 

 brown, and the red base is wanting in the i^ectoral and ventral, but Nordmann 

 states that the colour varies locally, and with the season. It is common in the 

 15 



