163 



air bliuUler iiioro than one to two tinu's; and the other folds are not .spiral 

 but longitudinal. The eyes are not (luite as dark (in two fresh specimens I 

 observed a reddish tinge in up])er edge of the eye). Compared with 

 anomalum. the tail of the new species is a little stouter and its mouth 

 is a little larger and more terminal, and the abdomen is not so thick. It 

 has no dark vertebral line; no distinct opercular spot: and the lateral 

 line is more distinct and passes over and under the eyes. But as before 

 stated, the main difference is in the alimentary canal. 



Anomalum is certainly a mud-eatei', while the diet of brevis is not 

 altogether conrtned to mud; some had grassy substances in their ali- 

 mentary canals. The difference is not a sexual diftVrence. I examined 

 several males and females of anomalmn. and all of them had tlie peculiar 

 arrangement of the alimentary canal of the typical anomalum. Number 

 809") of Indiana University Museum is identical with the new .species. 

 It was taken in Tennessee by S. K. Meek, and was not examined 

 internally. 



