op. 



, prop. 



^ intop. 



subtjp. '' 



^. Urthy. 



r. hr. 



Fig. 3 Idrissia carpathica n. sp. opercula (after specimen No. 46, 



Os) ca. X 7. 

 mtop. interoperculum, krthy, keratohyale, op. operculum, prop. 

 praeoperculum, r. hr. radii branchiostegii, suhop. suboperculum. 



In the oral cavity of specimen 187 Os., the caudal end of some 

 smaller fish can be seen clearly indicating the predatory manner of 

 life of I. carpathica. 



The vertebral column consists of 38 — 39 vertebrae (of which 15 are 

 caudal). The length of the last five caudal vertebrae is equal to their 

 depth; nearer to the front of the body, the caudals and the precaudals 

 grow longer. In IdHssia juhae Aramb. the last five caudals are likewise 

 strongly shortened (Arambourg 1954). In specimens of I. carpathica, 

 these caudals are but slightly reduced in length as compared with the 

 other vertebrae. An upturned urostyle and numerous hypural plates 

 are seen on the end of the vertebral column (Fig. 4). The neurapophyses 

 of the caudals are long, thin, reaching almost to the dorsal border of 

 the body, while the neurapophyses of the precaudals are shorter, in 

 some individuals apparently thicker. The ribs are thin but long, reaching 

 almost to the ventral border of the body. Heamapophyses at first short, 

 but gradually logger, occur in the caudal part. Similarly to the case 

 of I. juhae Aramb. long, thin intermuscular bones occur in the forebody, 

 beginning from the 18th vertebra (from the back), and are placed at 

 a sharp angle in relation to the centrum. 



The pectoral fins are placed immediately behind the head, low 

 down on the ventral border of the body. They are narrow and long, 

 in length corresponding to 8 — 10 precaudal vertebrae, and consisting 

 of about 14 soft rays. In Idrissia juhae Aramb., the number of these 



2 — Ichtyofauna 



