50 Rtiliiiesque's Description of the 



4. Sihtrus argentinus. Silvery cat-fish. Body compressed, enr 

 tirely of a silvery white, jaws nearly equal, lateral barbs shorter 

 than the head, lateral line straight, spinous ray of the pectoral 

 fins shorter and smooth, anal fin with 25 rays, tail equally 

 forked. 



A small species, rather scarce, seen only once in the lower 

 parts of the Ohio. Length six inches, fins brownish, eyes 

 elliptical. 



Sectiov II. Silures with a bilohed tail. 



5. Silurus nebulosus. Cloudy cat-fish. Body olivaceous, 

 clouded with irregular brown spots, jaws nearly equal, eyes small 

 and round, lateral barbs brown, half the length of the head, 

 opercule with a membranaceous appendage, all the fins with a 

 soft spinous ray concealed under the membrane ; anal fin with 

 twelve rays, tail decurrent slightly bilobed or notched, lateral 

 line slightly curved beneath. 



A large species, commonly three feet long, often weighing 

 lOOlbs. and more. Belly white, fins reddish, eyes singular, 

 quite small, black ; iris round, reddish brown, barb white, 

 lips thick, teeth divided in two tabular files. D. 1 and 7. P. 

 1 and 9. Abd. 1 and 8. A. 1 and 11. C. 20. 



6. Silurus Viscosus. Clammy cat-fish. Brownish, clammy ; 

 throat white, jaws nearly equal, eyes round, lateral line curved 

 upwards at the base, lateral barbs one third of the length of the 

 head, spinous ray of the dorsal and pectoral fins short and thick, 

 anal fin with fifteen rays, tail black unequally bilobed, upper 

 lobe smaller and white. 



Found near Luisville, at the falls, a small species only four 

 to six inches long, entirely covered with a thick clammy sub- 

 stance, which is commonly covered with dirt. The head is long, 

 flat, and with a furrow above ; body often with bluish and grayish 

 shades ; fins brown, anal fin and tail black ; adipose dorsal fin 

 very large ; iris small, round, bluish. D. 1 and 7. P. 1 and 7. 

 Abd. 9. A. 15. C. 22. 



Section III. Silures with an Entire Tail. 



7. Silunis lividus. Brown cat-fish. Body of a livid lead 

 ferown, throat pale, jaws nearly equal ; barbs nearly equal, the 



