1853.] 391 



The scales are large, higher than long, and disposed in twenty rows on the 

 line of the greatest depth, and about eight rows on the peduncle of the tail. 

 The lateral line is very conspicuous, from head to tail, and very nnuch arched 

 on the body. 



The opercular flap is very large, broad and posteriorly rounded, and margined 

 with whitish. Irregular liaht 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 LoxGULus, B. and G. Body rather elongated, subfusiform; the 

 head conical and continuous with the body, save a little depression on the snout. 

 'J'he elouiiated appsarance 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 ba-^e 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 has eight 

 soft rays and three spiny ones. 1 he caudal is slightly emarginate posteriorly, 

 and its anijles 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. 



D X. 9 or 10. A III. 8. C 2. I. 8. 7 I. 1. V I 5. P 13. 



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 lutrensis, B. and G. Body elongated, fusiform, connpressed, 

 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. 



D I 8. A I 9. C 2. I. 9. 8. I 1. V 8. P U. 



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 bubalinus, 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 tip? reach the anterior margin of the anal. 

 The tips of pectorals are contiguous to the base of ventrals. 



D 8. A I 9. C 4. I. 9. 9. I. 3. V 8. P 11. 



The scales are large and the lateral line forms a very 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. Ceraticthys vigilax, B. and G. Body fusiform, compressed ; specimens 

 before us two inches long, probably immature. The head forms the fifth of the 



66 



