1854.] 25 



nuchal line. Caudal fin posteriorly emarginated. Spiny dorsal comparatively 

 low. Soft part of dorsal and of anal well developed. Tip of ventrals reaching 

 the anterior margin of anal. Pectorals not extending quite as far back. Scales 

 along lateral line, 45. 



D'XI. 10. A III. 10. C 3. I. 8. 7. I. 2 V I. 5. P 14. 



Uniform reddish brown, lighter on lower part of flanks. A small black spot 

 at the posterior basal part of the soft dorsal. Dorsals, caudal and anal greyish, 

 with a darker margin. Ventrals and pectorals yellowish. 



Rio Cibolo and Rio Salado, Texas. J. H. Clark. 



5. Pomotis heros, B. and G General outline subelliptical. Nape depressed. 

 Head forming the third of the length, not including the caudal fin. Caudal 

 entering for about five times in the total length. Eyes large, and contained 

 four times, by their diameter, in the length of side of head. Mouth small ; pos- 

 terior extremity of intermaxillaries not extending beyond a vertical from the 

 anterior rim of the orbit. Pectorals very long, their tip reaching backwards as 

 far as the second soft ray of anal fin. Tip of ventrals extending to the first spine 

 of the anal. Caudal crescent-shaped. Spiny dorsal elevated. 



D X. 12. A III. 11. C 3. I. 8. 7. I. 2. V I. 5. P 13. 



Color uniform blackish brown. Pectorals yellowish; other fins greyish. Oper- 

 cular flap black with a whitish border, 



Rio Cibolo, trib. of Rio San Antonio, Texas. J. H. Clark. 



6. Bryttus longtjlus, B. and G. Pomotis longulus, B. and G. Proc. Acad. 

 Nat. Sc, Philada. vi. 1853, 391; and in Marcy's Expl. Red River, La., 1853. 

 PI. xii., page 245. 



The specimens are larger than those previously described. The coloration is 

 likewise better preserved. 



D X. 11. A III. 9. C 3. I. 8. 7. I. 2. V I. 5. P 13. 



The ground color, as preserved in alcohol, is reddish brown with minute im- 

 punctures of greyish, the dorsal and anal being provided posteriorly, the first with 

 a subcircular, large black spot, the second with an elongated spot of the same 

 color, and extending nearly to the whole base of the soft part of that fin. The 

 pectorals and caudal are uniform greyish, the latter having a yellowish border. 

 Ventrals and external half of* anal yellowish. 



Rio Cibolo, trib. of Rio San Antonio, Texas. J. H. Clark. 



7. Grystes nuecensis, B. and G. Head forming four-thirteenths of the entire 

 length. Mouth deeply cleft ; its angle reaching a vertical passing backwards of 

 the eye; lower jaw longer than the upper. Eyes rather large ; their diameter 

 contained six times in the length of side of head. Scales on the cheeks a little 

 smaller than those on the opercular apparatus. First dorsal lower than the second, 

 caudal subcrescentic posteriorly. Anal extending a little further behind the 

 second dorsal, though shorter and less deep. 



D X. 13. A III. 11. C 4. I. 8. 8. 1. 3. VI.5.P 15. 



Ground color of back black, clouded with greyish brown. Sides dull yellow- 

 grey, with an interrupted darker band. Beneath light yellow. 

 Rio Frio and Rio Nueces, Texas. J. H. a Clark. 



LABRIBJE. 



HERICHTHYS, B. and G. Body compressed ; outline subelliptical ; frontal 

 region convexe. Teeth small, subcorneal, simple, anterior row the most con- 

 spicuous. Lower lip entire. Five branchiostegal rays. Ventrals, dorsal and 

 anal fins acuminated ; caudal rounded. Five or six spiny rays to the anal. Scales 

 large ; lateral line interrupted posteriorly. 



Obs. This genus has strong affinities with Heros of Heckel, from which it 

 chiefly differs by the structure of tlTe anterior row of maxillary teeth, which are 

 simple, instead of bein^ provided with lateral hooks. The relative size of the 

 scales will likewise afford another generic feature of no small importance. 



8. Herichthys cyanoguttatus, B. and G. Head forming about two-sevenths 

 of the entire length. Snout subconical, detached from the frontal line by a de- 



