L. Agassiz on Fishes from Tennessee River. 305 
first dorsal, but equal to one another. Caudal lunate. Type of 
the genus: E'thblennioides, Raf. 
per. Opercular apparatus, cheeks and neck destitue of scales, 
First dorsal much lower than the second, with clubshaped rays 
when full grown; membrane of this fin extending to the base of 
the second dorsal. Anal smaller than the second dorsal. Caudal 
rounded. Only one species known: C. lineolatus, Agass., dis- 
covered by Dr. L. Watson in small creeks near Quincy, lll. Phe 
whole body olive green with close narrow interrupted black longi- 
tudinal lines; transverse lines of the same color across the caudal. 
3. Pitzoma, Dekay.—Head conical, pointed, truncated at the 
end, in form of a hog’s snout; mouth moderate, in form of an 
oblique are of a circle, opening below the end of the snout, very 
slightly protractile. Lower jaw shorter than the upper. 
culum and cheeks scaly. Membrane of the first dorsal not reach- 
ing the base of the second. Anal smaller than the second dor- 
sal. Caudal truncate or slightly lunate. Type of the genus : 
P. caprodes. (Htheostoma caprodes, Rafin.) 
- Haprorrervus, Agass.—Head conical, obtusely pointed, 
tounded at the end; mouth moderate, terminal, not protractile, 
Jaws nearly equal. Operculum and cheeks scaly. Membrane of 
the first dorsal extending to the base of the second. Anal and 
second dorsal large and equal. Caudal truncate or slightly Iunate. 
Only one species known: Hi. nigrofasciatus, Agass. From the 
neighborhood of Mobile, Alabama. Discovered by Albert Stein, 
q- Brown above, lighter below, with transverse black bands, 
Wider in the middle than nearer to the back or the belly. 
5. Hyosroma, Agass.—Head short, blunt, rounded, with swol- 
len cheeks, Mouth comparatively small below the snout, slightly 
Protractile. Lower jaw shorter than the upper, which may be 
Concealed in a deep furrow below the snout. Opercular appara- 
tus and cheeks scaly. First dorsal long, but not reaching the 
of the second. Anal smaller than the second dorsal. Cau- 
dal slightly lunate. Only one species known: H. Newmanii, 
‘sass. Discovered by Dr. Newman in the vicinity of Hunts- 
Ville, Alabama, where it is called “Salmon.” This fish is uni- 
‘ormly brown with irregular transverse black blotches. A red 
Sttipe along the base of the first dorsal. 
tractile, though the maxillary bone be moveable. Opercular ap- 
Paratus sealy, cheeks bare. First dorsal distinctly separated from 
the second. Anal smaller than the second dorsal. Caudal tran- 
‘ate or slightly rounded. The species of this genus are among 
Stooxn Sruies, Vol. XVI, No. 50.—March, 1854. 89 : 
