04. OKTHODON. 27'") 



a, b-d. Half -grown. Coimbra. Presented by Dr. B. du iJooage. 

 e-f. Young. Cintra. Presented by Dr. V>. du Bocage. 



On a svipp'oscd Jn/brid between this species and Barbus bocagei, see 

 the latter species, p. 92 ; and on another with Leuciscm arcasii, 

 p. 210. 



Chondrostoma vnllkommii, Steindachner, I. c. p. 266, taf. 2, from 

 the Guadiana and Guadalcjuivir, is most closely allied to C polylepis, 

 but distinguished l)y having pharyngeal teeth 0.0 or 7. L. lat. 

 generally 04-f;0. L. transv. '^• 



7. Chondrostoma phoxinus. 



Hvckcl, ill IiNssc(/(/crs Jieisoi, i. p. 10-'>] ; Sitzysbci: Ah. Wiss. Wieii, 

 1852, ix. p. llo, taf. 10; Hechel i^^ Kner, Sihswasserf. p. 226. fios. 

 131, 132. 



D. 11. A. 10-11. L. lat. 88-90. L. transv. 17/10. 



The height of the body c(juals the length of the head, and is 

 nearly two-ninths of the total (without caudal). Snout not much 

 projecting beyond the mouth, the cleft of which is arched. Pharyn- 

 geal teeth . 6. The length of the pectoral fins is fmir-fifths of that 

 of the head. {Heck.') 



Sign (Dalmatia) ; Livno (Bosnia). 



04. ORTHODON. 



Orthodou, Girunl, Proc. Ac. Nat. Sc. Philud. 18o0, p. 182. 



Scales very small, lateral line present, running along the' middle 

 of the side of the tail. Dorsal fin short, Avithout spinous ray, com- 

 mencing opposite to the ventrals ; anal fin short. The iqyper and 

 lower basal rai/s of the large caudal Jin ai'c KnusvuUg developed. Mouth 

 anterior, crescentic ; intcrmaxillaries protractile. Loiver jaiv ivith a 

 sharp anterior edge and a slight knob on the symphysis, and with 

 the labial folds developed laterally only, jSTo barbel. GiU-rakers of 

 moderate length, numerous, compressed, with the inner edge fringed, 

 Pseudobranchice none. The attachment of the gill-membranes to the 

 isthmus takes place opposite to the angle of the praeoperculum. 

 Pharyngecd bones ivith the upper limb very broad and concave, sepa- 

 rated by a deep notch from the dentigerous portion. Pharyngeal teeth 

 strongly compressed, lancet-shaped, 6 or 5 — 6 or 5, Peritoneizm 

 black. Intestinal tract with numerous convolutions. 



California. 



1. Orthodon microlepidotus. 



Gila microlepidota, At/res, Proc. Calif. Acad. Nat. Sc. i. 1855, p. 21. 

 Orthodon microlepidotus, Girard, U. S. ^- Pac. H. P. Exped. Fish. 

 p. 237, pi. 53. figs. 1-4. 



D. 12. A. 10, V. 10-11. L, lat, 105-110, Yert. 24/20. 

 The height of the body is two-ninths of the total length (without 

 caudal), the length of the head one-fourth. Snout very broad, of 

 moderate length. Eve rather small, its diameter being one-half of 



