282 PROCEEDINGS OF THE ACADEMY OP 



Albarnops plnmbeolus. 



Form compressed ; mouth oblique ; mandible slightly more prominent than 

 premaxillary border. Eye 2f in length of bead ; operculum higher than long ; 

 the superior border very short ; the supero-posterior concave : posterior an- 

 gle more than 90. Length to base of tail a little over four times length of 

 head, and 4f the greatest depth. Frontal and dorsal outline a gentle arch. 

 Anterior base of dorsal half way between base of caudal and end of muzzle. 

 Height of dorsal less than half length from its anterior base to base of caudal. 

 Fins short ; ventrals extending way to vent. Scales moderate f 39, with seven 

 or eight rather faint radii, and minute numerous concentric lines. Radial for- 

 mula D. 18. A. 19. V. 8. P. 13. 



Length three inches. Pharyngeal bones with strong ala, especially dilated 

 on the superior angle, terminating in a sharp angle opposite the second tooth 

 from above ; lower limb long ; teeth 2, 4 4, 2. 



Everywhere silvery, with a blueish reflection, except a dusky vertex and 

 brownish dorsal region and basal caudal spot. 



From Flint, on a branch of the Saginaw. 



I have regarded this species as an Alburnops on account of the distinct 

 masticatory surface of the teeth, although the upper jaw does not overlap the 

 lower as in the types of that genus. The form of the scales distinguishes it 

 readily from Hypsilepis. It is generally similar to Squalius. 



Alburnus* rubellus Agass. 



The anal fin of this fish is shorter than in true Alburnus : teeth 2, 4 4, 2, 

 without masticatory surface. Scales f 38. Head 4j times in length to base 

 of caudal. 



Three specimens from Flint. 



Pimephales m i 1 e s i i, sp. nov. 



A species differing from the promelas in its larger scales, longer muzzle 

 and other points approximating Hybognathus. 



Mouth oblique, outlines of snout forming less than a right angle in profile. 

 Eye entering Ah times in length of head, which latter is one- fourth of length 

 to base of tail, and equal to greatest depth of body. Scales ^40, nearly round, 

 lateral line extending as far as the fourteenth. Dorsal fin with 1, 9 rays ; 

 the first and last jointed are equal, the middle the highest. Caudal wide ; 

 complete rays 21. Anal small, longer than wide, 1, 7. Ventrals not reaching 

 anal, 1, 8. Pectorals extending three-fifths distance to ventrals. From base of 

 caudal to front base of dorsal equal from latter point to anterior nostril. 

 Frontal breadth double diameter of orbit. Length 2 in. 5 lines. 



General color pale reddish-brown, much paler below, and a faint blackish 

 longitudinal line. Top of head blackish ; its sides silvery. 



From Grosse Isle, Detroit River. Named from Prof. Miles, who, in connec- 

 tion with Prof. Fox, has added much to north-western Zoology. 



Pimephales promelas, Raf. 

 Specimens from near Lansing. 



Hyborhynchusf n o t a t u s, Agass. 



r isterior nostril. 

 udal. Eye three 



* Alburnus oligaspis. 



Under jaw projecting a little beyond upper ; maxillary extending to opposite po; 

 Head conic in profile, with muzzle compressed, one fifth of length to notch of cauc. ... 

 and one-fifth times iu length of head. Operculum higher than long, J'ins short (except anal); 

 ventrals anterior to dorsal. Dorsal 1-8. C. 20. A. 1-14. V. 7. P. 15. Scales rather large, 41. 



Lateral line, with a long, gentle anterior deflection. 



Length about two inches. 



Above reddish; sides of head and broad lateral band silvery. Below medially yellowish. 



Brought from Kansas, by Dr. W. A Hammond. 



f In this place maybe described the Algansea antica, sp. nov., brought by Dr. Woodhouse 

 from Texas, aud presented to the Academy Museum. It is nearest to the formosa of Girard i 



[Dec. 



