1S4 CTPRINIDJB. 



Ilyborhynclms, Girard, U. S. l<f Prac. R. R. Exped. Fish. p. 230 (not 



Agassiz) . 

 IlybogTiathus, Agassiz, Amer. Joiirn. Sc. ^ Arts, 1855, xix. p. 228. 



Scales of moderate or small size ; lateral line present, running 

 along the middle of the tail. Dorsal fin short, without spinous ray, 

 commencing nearly opposite the ventrals ; anal fin short. Mouth 

 anterior, or subanterior, narrow ; intermaxillaries protractile ; lower 

 jaw with a rather sharp edge, the labial fold beiiig developed on the 

 side only. Barbels none. Gill-rakers short ; pseudobranchiae. The 

 attachment of the gill-membrane to the isthmus takes place opposite 

 to the angle pf the prajopcrculum. Pharyngeal teeth compressed, 

 4 — 4, or 4 . 1 — 1 . 4. Intestinal tract with numerous convolutions. 



United States. 



1. Hybognathus nuchalis. 

 Agassiz, I. c. p. 224. 



D. 11. A. 9. V. 8. L. lat. 38. L. transv. 5/6. 

 The height of the body is a little more than the length of the 

 head, which is contained four times and one-third in the total (with- 

 out caudal). Hind margin of the eye nearer to the end of the 

 operclo than to that of the snout ; snoui scarcely longe:. than the 

 eye, which is one-fourth of the length of the head. The dorsal 

 begins slightly in advance of the ventrals, somewhat nearer to the 

 end of the snout than to the root of tbe caudal. There are four 

 longitudinal series of scales between the lateral line and root of the 



and U. S. ^ Pac. R. B. Exped. Fish. p. 235, pi. 53. figs. 5-8.— Missouri; 

 Arkansas. 



5. Hybognatbiis evansi, Girard, U. cc. — Nebraska, Platte River. 



6. Ceratichthys vigilax, Bavrd l<( Girard, Proc. Ac. Fat. Sc. Philad. 1803, 



p. 391 ; Leuciscus vigilux, BairdS, Girard, in Marcy, Eiylor. Bed Biver, 

 1S.")3, p. 248, pi. 24. figs. 1-4 ; Cliola Tigilax, Girard. Proc. Ac. Hat. Sc. 

 Philad. ]8.^G, p. 192; and U. S. # Pac. B. B. Expcd. Fish. p. 257.— 

 Red River ; Arkansas 



7. Cliola velox, Girard, Proc. Ac. Kaf. Sc. Philad. 1856, p. 192, and U. S. 



8f Pac. B. B. Eiyed. Fish. p. 258.— Texas. 



8. — — vivax, Girard, II. cc. — Texas. 



9. Dionda episcopa, Girard, Proc. Ac. Nat. Sc. Philad. 1856, p. 177 ; or U. 



S. ^- Pac. B. B. Eaprd. Fif^h. p. 227.— Rio Pecos. 



10. papalis, Girard, I. c. 1°, p. 178 ; or /. c. 2°, p. 228.— JJelaware Creek 



(Rio Pecos). 



11. plunibea, Girard, I. v. 1°, and I. c. 2°, pi. 52. figs. 21-25.— Canadian 



River. 



12. spadicea, Girard, I. c. 1°, and I. c. 2°, p. 229, pi. 52. figs. 26-30.— 



Fort Stiiilb, Arkansas. 



13. grisea, Girard. I.e. 2°, p. 230, pi. 52. figs. 6-10.^ — Twenty miies 



west of Cboctaw Agency. 



14. Serena, Girard, Proc. Ac. Nat. Sc. Philad. 1856, p. 177, and U. S. 



^- Mex. Bound. Ichthi/ol. p. 42, pi. 26. figs. 9-12.— Rio Sabinal, Texas. 



\7\. texensis, Girard, II. cc. figs. 21-24.— Rio Nueces, Texas. 



16. argentosa, Girard, I.e. 1°, p. 178, and I.e. 2°, p. 43, pi. 26. figs. 5-8. 



—Texas. 



17. cbrysitis, Girard. II. cc. figs. l.'.'-16. — Live Oak Creek, Texas. 



18. mefanops, Girard, I.e. 1°, and I.e. 2°, p. 44, pi. 'Ai. figs. 17-20. — 



Eiiena Vista, Coahuila 

 19. couclii Girard, II. er. figs. 14. — New Leon. 



