332 Fishes of Upper Georgia. 



Specimens identical with R. obtusus Ag. are abundant in 

 the small clear brooks which flow from the springs in the 

 hill country, known locally as Spring Branches. Most of 

 my specimens were taken in Mobley's " Spring "Branch," 

 which flows into Silver Creek, near Rome, Ga. The species 

 is known locally as Rock Fish. 



PHENACOBIUS. 



Phenacobius Cope. Proc. Phil. Ac. Sc, 1867, 96. 

 Sarcidium Cope. Hayden's Geol. Survey, 1870, p. 440. 



21. PHENACOBIUS CATOSTOMUS sp. nov. 



Form rather slender, scarcely compressed and nearly terete, much as in 

 Catostomus teres, which species it resembles in color. 



Back nearly straight, hardly elevated at all ; caudal peduncle rather 

 stout. Depth 6 in length of body, without caudal. 



Head large, 4J in length of body, bluntly rounded, convex above, the 

 vertex nearly plane ; cheeks much swollen ; snout blunt and heavy ; mouth 

 small, inferior, its structure as described by Cope under P. uranops; a 

 small groove between premaxillary and nasal bones. Preorbital bone 

 oblong. 



Eyes large and prominent, 1J in length of muzzle, 3 J in head, wider 

 than the interorbital space ; eyes high up, the orbits rising above the level 

 of the top of the head. 



Scales quite small, longer than deep, thin and rather loosely imbricated, 

 about equal over the body ; about 60 (58 to 62) in the lateral line, which is 

 nearly straight. 



Fins rather small. Dorsal very slightly in advance of ventrals, slightly 

 nearer snout than base of caudal. Pectorals not reaching ventrals. Ven- 

 trals reaching vent, which is an unusual distance in advance of anal. 



Pharyngeal bones rather small, the teeth slender, pretty strongly hooked, 

 4-4. Peritoneum white, intestinal canal shorter than body ; air bladder 

 quite small. 



Color pale olivaceous, white below, a silvery lateral streak underlaid by 

 blackish, which appears as a vague dusky blotch at base of caudal ; head 

 nearly black above ; cheeks bright silvery ; dorsal scales dusted with fine 

 black points; fins unicolor; a yellowish vertebral line. 



D., I, 8. A., I, 7. Lat. 1. 60. 



Habitat. This species is abundant in Silver Creek, Floyd 

 Co., Ga., just above its junction with the Etowah. It reaches 

 a length of four inches. I at first considered it P. uranops 



