CTPKINID^. 



Fam. 17. CYPRINIDiE. 



Cyprinidse, Agassiz, Poiss. Foss. v. p. 5. 



Body generally covered with scales, head naked. 

 Margin of the upper jaw formed by the intermaxil- 

 laries. Belly rounded, or, if trenchant, without ossi- 

 cles. No adipose fin. Stomach without blind sac. 

 Pyloric appendages none. Mouth toothless ; lower 

 pharjTigeal bones well developed, falciform, subparallel 

 to the branchial arches, provided with teeth, which are 

 arranged in one, two, or three series. Air-bladder 

 large, divided into an anterior and posterior portion 

 by a constriction, or into a right and left portion, en- 

 closed in an osseous capsule ; absent in Homaloptera. 

 Ovarian sacs closed. 



Fresh waters of the Old World and North America. 



"We first give a synopsis of the groups, and then one of the genera. 



Synopsis of the Groups. 



I. Air-bladder divided into an anterior and posterior portion, not 

 enclosed in an osseous capsule. Barbels 0-4. 



A. Pharyngeal teeth in a single series, exceedingly numerous, and 



closely set. Dorsal fin elongate, opposite ^o ventrals ; anal 

 fin short. Barbels none. 1. Catostomina, p. 12. 



(Gen. 1-4.) 



B. Pharyngeal teeth in a single, double, or triple series, in small 



number, the outer series never containing more than seven 

 teeth. 



1. Anal fin very short, with five or six (exceptionally seven) 

 branched ra^-s. 



a. Lateral line running along the median line of the tail. 

 Dorsal fin opposite to ventrals. 



2. Cypiinina, p. 25, 



(Gen. 5-43.) 



h. Lateral line running along the median line of the tail. 

 Dorsal fin inserted behind the ventrals. 



3. Eohteichthyina, p. 191. 



(Gen. 44.) 



