480 FISHERIES OF THE UNITED STATES. [94] 



CYPRiNnxas. 



Genus CAMPGSTOMA Agassiz. 



103. CaBBBp©st©nia aiionaalum (Eaf.) Agassiz. Stone-roll- 



er ; Stone-lugger; Steel y-back Minnow. 



Eastern United States from New York southward to 

 North Carolina ; Ohio and Mississippi Valleys south- 

 ward to Texas, and west to Dakota ; Mexico. 



This is the most singular and interesting of our Cypri- 

 nidce, having the air-bladder surrounded by convolu- 

 tions of the alimentary canal. 



8484. Yellow Creek, Ohio. Prof. S. F. Baird. 



Genus ACBOCHILUS Agassiz. 



104. Acrochilus alutaceiis Agassiz & Pickering. Hard- 



mouth. 



Columbia Eiver and its tributaries. 



This fish derives its name from the presence of a horny 



plate on each of the jaws; it reaches a length of 12 



inches. 



30297. John Day River, Oregon, August 5, 1881. Capt. Charles Ben dire. 



Genus OKTHODON Girard. 



105. Orthodon microlepidotos (Ayres) Girard. 



Eivers of California ; Great Basin of Utah (Yarrow). 

 This species reaches a length of 12 inches. 



27139. Sacramento River, California, 1880. Jordan & Gilbert. 



Genus LAVLNIA Girard. 



106. Lavinia exilicauda Baird & Girard. 



Eivers of California. 



This is equal in size to the last. 



19608. California. L. Stone. 



Genus CHBOSOMUS Eafinesque. 



107„ Chrosomiis erythrogaster Agassiz. Eed-bellied 

 Dace. 

 Eastern ISTew York to Maryland, west to Dakota, and 



southward to Tennessee. 

 This is a small, but handsome species, particularly bril- 

 liant in spring. 

 9037. Yellow Creek, Ohio. Prof. S. F. Baird. 



