C'YrHIJfODONTID^, 299 



Fam. 15. CYPRINODONTIDiE. 



Cyprinodontes, Ac/assiz, Poiss. Foss. v. 2. p. 47 ; Muller, Abhandl. Akad. 

 Wiss. Berl. 1846, p. 183. 



Head and body covered with scales ; barbels none. 

 Margin of the upper jaw formed by the intermax- 

 illaries only. Teeth in both jaws; upper and lower 

 pharyngeals with cardiform teeth. Adipose fin none ; 

 dorsal fin situated on the hinder half of the body. 

 Stomach without blind sac ; pyloric appendages none. 

 Pseudobranchise none ; air-bladder simple, without 

 ossicula auditus. 



Sexes frequently differentiated. Mostly viviparous. 

 Freshwater fish, of Southern Europe, Africa, Asia, and America. 



Synopsis of the Genera, 



I. The bones of each mandibulary are firmly united ; intestinal 

 tract short or but little convoluted (Cypeinodontid^ carni- 



VOKiE). 



A. Anal fin of the male not modified into an intromittent 

 organ. 



1. TeetJi incisor-like, notched (Cypeinodontina). 



a. Ventral fins present. 



Teeth in a single series 1. Cyprinodon, p. 301. 



Teeth in several series, all the teeth being tricuspid. 2. Fitzeoyia, p. 307. 



A band of villiform teeth behind the series of incisors. 



3. Chaeacodon, p. 308. 



b. Ventral fins none. 



Teeth in a single series 4. Tellu, p. 308. 



2. All the teeth pointed (Fundulina). 



a. Ventrcdfins present. 



Teeth in a single series ; dorsal and anal fins many -rayed. 



6- LiMNURGUS, p. 309. 



Teeth in a single series ; number of fin-rays not increased. 



6. LucANiA, p. 309. 



Teeth in narrow bands; dorsal fin short, commencing behind the anal, which is 

 more or less elongate. Air-bladder present 7. Haplochilus, p. 310. 



