1853.] 391 
The scales are large, jatar than long, and disposed in twenty rows on the 
line of the greatest depch, and about eight rows on the peduncle of the tail. 
The lateral line is very conspicuous, from head to tail, and very much arched 
on the body. 
The opercular flap is very large; broad and posteriorly rounded, and margined 
with whitish. Irregular light lines are observed on the cheeks and opercular 
apparatus. The color of the body appears to have been uniform reddish brown. 
Otter Creek, Arkansas. 
2. Pomotis Loneutus, B. and G.—Body rather elongated, subfusiform; the 
head conical and continuous with the body, save a little depression on the snout. 
The elongated appearance of this species is owing to the head and peduncle of 
the tail being longer than usual in this genus. The posterior tip of both dorsal 
and anal fins do not reach the base of the caudal. The origin of the dorsal is 
immediately above the membranous flap of the operculum; it is composed of 
ten spiny, or nine or ten soft rays. The anal is situated very far back, its an- 
terior margin begins opposite to the fourth soft rays of the dorsal; it bas eight 
soft rays and three spiny ones. ‘Ihe caudal is slightly emarginate posteriorly, 
and its angles rounded. It is composed of seventeen fully developed rays and a 
few rudimentary ones. The ventrals are placed under the pectorals; their tips 
when bent backwards do not reach the anus. The pectorals are subelliptical, 
and extend as far back posteriorly as the ventrals. 
DX. 9or 10 VAI SC 2.1 887 Lois Wl 5. B13; 
The scales are of medium size, longer than high. Twenty seven rows may 
be counted across the line of greatest depth of the body, and about thirteen rows 
on the tail. The lateral line is regularly arched on the body, and almost 
straight on the tail. 
Color uniformly dark brown, probably considerably altered by the alcohol. 
The membranous opercular flap is comparatively small and entirely black. Ir- 
regular lighter lines are observed on the cheeks and opercular apparatus. 
Otter Creek, Arkansas. 
3. Leuciscus LurRrensis, B. and G.—Body elongated, fusiform, compressed, 
largest specimen examined, two inches and three-eights; head forming a little 
less than the fourth of the entire length. Eyes proportionally large. “Anterior 
margin of the dorsal fin at an equal distance from the snout and base of caudal. 
Caudal forked. Anal fin entirely behind the dorsal. Insertion of ventrals in 
advance of the dorsal; their tip not reaching the anterior margin of. the anal. 
Tip of pectorals almost contiguous to the base of the ventrals. Scales large. 
Lateral line forming a very open curve convex towards the abdomen, and nearer 
to it than to the back. 
DIS. A LOC 2.1 928. 0 1.5V 8. P ti. 
Ground color bluish brown; back blue; dorsal fin yellowish brown; caudal, 
pectorals and ventrals, reddish. 
Specimens of this species were caught in the Otter Creek, Arkansas. 
4. Leuciscus puBatinus, B. and G.— Body very much compressed, back con- 
siderably arched, and peduncle of tail quite narrow. Head two-ninths of the total 
length, which is two inches and one-eighth. The dorsal and anal fins are very 
much developed, while the pectorals and ventrals are comparatively small. The 
caudal is forked. The base of ventrals is under or a little behind the an- 
terior margin of the dorsal, and their tips reach the anterior margin of the anal. 
The tips of pectorals are contiguous to the base of ventrals. 
Ds. AI9,C4.1.9.9.1.3.V 8. P11. 
The scales are large and the lateral line forms avery open curve convex 
towards the abdomen and nearer to it than to the back. Differ from the pre- 
ceding by the structure and position of the fins and scales. 
Caught with the preceding in Otter Creek, Arkansas. 
5. Ceratictuys vicitax, B. and G.—Body fusiform, compressed ; specimens 
before us two inches long, probably immature. The head forms the fifth of the 
86 
