genera of that family. Ownig to inadequate knowledge concerning the 

 osteology of Ichthyococcus Bonaparte, differences thus far reported 

 between these genera primarily concern the body dimensions; in adult 

 individuals of Ichthyococcus Bonaparte, the relation of the body depth 

 to the body length considerably exceeds that in Idrissia Aramb. Accord- 

 ing to Brauer (1906), however, the body depth in young individuals 

 of genus Ichthyococcus Bonaparte is distinctly smaller, while a compar- 



Table 2 

 Comparison of characters of Idrissia juhae Aramb. and. I carpathica n. sp. 



Character 



Idrissia juhae 

 Aramb. 



Idrissia carpathica 

 n. sp. 



End of obliquely oriented snout 



below 

 orbit 



the center 



of 



not reaching the cen- 

 ter of orbit 



Dentary 



low 



high (maximum heigth 

 equal to half its length) 



Length of preorbital portion 



equal 

 orbit 



to diameter 



of 



less than diameter of 

 orbit 



Postorbital portion 



about 

 head 



one-third 

 Length 



of 



exceeds one-third of 

 head length 



Number of vertebrae 



40 



38—39 



Last 5 caudal vertebrae 



strongly reduced 



' 



slightly reduced 



Neurapophyses 



short 



long 



Number oi rays in pectoral fins 



18—20 



ca. 14 



Length of pectoral fins expressed 

 in length of precaudal fins 



ca. 5 



ca. 8—10 



Position of ventral fins 



approx. below 

 center of dorsal 



the 

 fin 



below last rays of 

 dorsal fin* 



Predorsal area in percents of body 

 length without caudal fin 



55—560/0 



50— 53"/o 



Number of rays in dorsal fin 



13 



10—11 



Preanal area in percents of body 

 length without caudal fin 



85»/o 



75—810/0 



Number of rays in caudal fin 



9 



11 



Number of side rays in caudal fin 



2—4 



10 



* Exceptionally in one individual the ventral fins are vertically placed 

 below the center of dorsal fin. 



12 



