226 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



therefore stand as EhinicMhys cataracta'. The teeth of the typical speci- 

 men have never been exaniined. The difference in the dentition oi Gobio 

 and EJiinichthys does not therefore aft'ect the correctness of this identi- 

 fication. 



17. Leuciscus boucardi Giiuther. 



Cat. Fishes Brit. Mus. vii, 485. 



The teeth of this species have a very narrow grinding surface. It is 

 tlierefore probably referable to the genus Myloleucus as understood by 



18. Ceraticlithys sallasi GUuther. 



Cat. Fishos Urit. Mus. vii, 484. 



As this species has no bnrbels, the propriety of its reference to 

 Ceraticlithys is not evident. It has the teeth 4-4 with grinding surface, 

 and is therefore referable to the genus Hudsonius {Ryhopsis Cope) as now 

 understood by nie. 



19. Ceicitichthys cumingi Giiiitber. 



Cat. Fishes Brit. Mus. vii, 177 



This species is a true Ceraticlithys^ evidently closely related to C. 

 amhlops. It perhaps was not taken in California. 



20. Graodus nigrotaeniatus Giiuthcr. 



Cat. Fishes Brit. Mus. vii, 485. 



There are three typical examples of this species. The teeth of two of 

 them were examined by Dr. Giinther, and liave, as stated by their de- 

 scriber, "i)haryngeal teeth quite rudimental replaced by a somewhat 

 uneven ridge of the bone." The third specimen, however, proved on 

 examination to have developed teeth, of the ordinary sort, two on each 

 side. Traces of the roots of similar teeth were visible on the other 

 specimens, but in none were any evidences of the existence of a greater 

 number. It is, therefore, possible that the normal number is 2-2. It 

 is my opinion, however, that the teeth are normally 4-4, and that in 

 these examples they have been lost, either by natural shedding or 

 tlirougli the softening due to long preservation in spirits. If this view 

 is correct, the genus Graodus should be suppressed. As the teeth are 

 without grinding surface, the species should be referred to the genus 

 Cliola, as understood by me, and should stand as Cliola niyrotmniata. 

 If the teeth are normally 2-2, the genus Graodus should be retained. 



Tlie writer wishes to express his obligations to Dr. Giinther for the 

 permission to examine these and other specimens in the British Museum, 

 and to I'rofessors Vaillant and Sauvage for similar favors at the jMu- 

 seum at Paris. 



October 20,. 1879. 



