554 



SCHRAETSER HOLOCENTRUS. 



Holocentras Schraetser. H. subfuscus, lineis utrinque quatuor 

 hngitudinalibus nigris, abdomine argenteo, capite nudo. 



Brownish Holocentras, with four longitudinal black lines on 

 each side, silvery abdomen, and naked head. 



Gymnocephalus Schraetser. Block. Perca Schraetser. Lin. 

 Gmel. 



Length about ten inches : shape somewhat 

 lengthened : head destitute of scales, for which rea- 

 son this species is by Dr. Bloch arranged under a 

 distinct genus by the name of Gymnocephalus: 

 scales rather small than large : tail slightly divided : 

 lowest of the longitudinal lines composed of a row 

 of spots : dorsal fin spotted with black : native of 

 the Danube and its tributary streams : in consider- 

 able esteem as an article of food. 



RADULA HOLOCENTRUS. 



Holocentras Radula. H. corpore pmctis albis lineato. 

 Holocentras with the body lineated by white specks. 

 Perca Radula. Lin. Gmel. Am. Acad. 



Dorsal fin very long : scales crenulated : native 

 of India* 



