Vol. XXII, pp. 209-210 December 31, 1909 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



THE CYPRINID SUBFAMILY CHONDROSTOMIN^. 



BY T. D. A. COCKERELL. 



Some time ago, when working on the North American 

 Chondrostominse, I was warned by Dr. Jordan to compare the 

 European Chondrostoma, as it might be found that the supposed 

 close relationship did not exist. This was not possible at the 

 time, but I now have before me scales of five species of Chon- 

 drostoma, and have made the necessary comparisons. On the 

 whole it must be said that there is sufficient resemblance to 

 strongly indicate tliat the affinities assured from the jaw- 

 characters, teeth, etc., are not illusory. Restricting the Ameri- 

 can Chondrostomina? to Acrocheilus and Orthodon, there seems 

 to be no reason why these should not be placed in the same 

 subfamily as Chondrostoma, and regai'ded as an offshoot from 

 the Old-World group, which doubtless reached America in 



Figure 1. 



Scale of Orthodon microlepidotus. 



8a.n Miguel, Calif. 



Miocene times. Oxi/geneum I have never seen; it is said to 

 have the form of Moxostowa, and I suppose it to come of quite 

 different stock from the Chondrostomines. 



31— Proc. Biol. Soc. Wash., Vol. XXII, 1909. (209) 



