Table 1 

 Dimensions of Idrissia carpathica n. sp. and I. juhae Aramb. (in mm) 





Idrissia carpathica n.sp. 



Idrissia ju- 

 bae Aramb.* 



Dimensions 



Holo- 



type 



164. Os. 



P 



ar a t 



y p e s 





T. 135 







187. Os. 



28. Os. 



77. Os. 



45. Os. 



T. 196 



Length of body without 

















caudal fin 



56.5 



ca. 44.5 



31.7 



49.5 



26.9 



50.0 



40.0 



Greatest depth of body 



11.3 



ca. 10.8 



6.5 



8.2 



6.0 



11.0 



10.0 



Length of head to posterior 

















margin of operculum 



17.9 



13.6 



10.0 



15.6 



8.4 



16.0 



16.0 



Preorbital area 



5.4 



3.9 



2.2 



3.8 



2.2 



5.0 



5.0? 



Horizontal diameter of orbit 



5.3 



4.7 



3.9 



5.2 



2.7 



5.0? 



5.0? 



Predorsal area 



30.0 



22.9 



15.9 



26.2 



13.6 



28.0 



22.0 



Preanal area 



44.5 



— 



24.7 



40.2 



20.6 



? 



34.0 



Preventral area 



34.5 



— 



17.8 



29.8 



15.9 



30.0 



25.0 



Length of caudal fin 



12.3 



— 



7.8 



12.7 



— 



11.0 



10.0 



* Vide Arambourg 1954. 



Skull. A narrow, long parasphenoid is the most distinctly preserved 

 part of the neurocranium. The other bones are, on the whole, poorly 

 preserved. Conical teeth may be seen on the maxillary bone of cranium 

 viscerale of several specimens (Nos. 191. Os., 85. Os., 185. Os.). Unfor- 

 tunately, neither the maxillary nor the premaxillary bone has been 

 found on any of the specimens. The shape and dentition of the dentary, 

 however, are quite distinctly seen on nearly all specimens. This is 

 a strong, stout bone (in length equal to twice the maximum depth), 

 the posterior margin not reaching to the line which centrally traverses 

 the orbit. The dentition of the dentary consists of small, even, sharp, 

 closely spaced conical teeth which seem smaller than the teeth on the 

 maxillary bone. 



The operculum is large, with thickened anterior margin and 

 slanting ventral margin, showing some slight corrugations parallel 

 to the ventral margin (Fig. 3). These corrugations, however, do not occur 

 on all the specimens, and therefore cannot be regarded as an index feature. 

 The long, upper and lower branches of the preoperculum are placed 

 at almost a right angle one to another. The anterior margin of the upper 

 branch shows marked thickening. The interoperculum is not clearly 

 outlined, but it also must have been fairly large. According to 

 Arambourg (1954), the marked development of the gill covers in the 

 genus Idrissia suggests some association with the Elopidae. 



8 



