318 SMITHSONIAN MISCELLANEOUS COLLECTIONS [voL. 48 
All the preceding species of the Pacific coast have been universally 
recognized as Leuciscines ; a couple of other west coast types resem- 
bling them in structure and form, as well as in the short intestinal 
canal, but differentiated by molariform pharyngeal teeth, have been 
Fic. 72. Mylocheilus lateralis. After Jordan and Evermann. 
segregated by Jordan and Evermann as the “ Mylopharodontine.” 
Three genera have been established, two of which are noteworthy. 
Both of them have the teeth in two rows (2, 4—5, 2 or 2, 5—5, 2), 
and each is represented by a single species. 
The Mylocheilus lateralis (miscalled caurinus) has the upper 
jaw slightly protractile and a small tag or barbel at the end of each 
maxillary. According to Jordan (1883), it “abounds from Cali- 
fornia to Puget Sound in all the streams of Oregon, Washington 
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Fic. 73.—Chondrostoma nasus. After Heckel and Kner. 
and Idaho, and often enters the sea. It reaches the length of little 
more than a foot.” It was formerly little used for food where trout 
and other fishes abound, but now, according to Jordan and Ever- 
