350 L. HussaTcoj — Note on a Palceoniscid Fish. 



what may be learned from the other specimen. In the first 

 place, it represents a larger fish, proving that the species 

 reached a length of at least 35 or 40 cm . Secondly, it retains 

 a small portion of the base of the anal fin ; this is composed 

 of numerous segmented, closely crowded rays. The enlarged 

 figure of a scale showing the ornamentation (fig. 2(7) was 

 drawn from this specimen. 



Relationships. — It is obvious that the specimens represent a 

 palasoniscid belonging to one of the later, more specialized 

 genera of the family. This is shown by the large size of the 

 fish, the stout mandible, strong dentition and the extremely 

 narrow ventral scales. But it is impossible to identify the 

 genus since the fins are lacking, and the ornamentation of the 

 head bones is not shown. On the whole, the fish seems closest 

 to Acrolepis* a genus represented by several species in the 

 Carboniferous and Permian of Europe and South Africa, but 

 not previously known from North America. Doubtless com- 

 plete specimens displaying all the characters of the species will 

 some day be found, and the naming of the species may best be 

 deferred until then. 



American Museum of Natural History, 

 New York City. 



* Woodward, A. S., Catalog of Fossil Fishes in the British Museum, Part 

 II, 501. 



