6 HAPLOMI. 



II. Viviparous. Males with the anterior- 5 or 6 ana] rays short, stiff, and subequal, separated 

 by a shallow notch from the rest of the fin. (Characodontin^.) 



A. Rami of the lower jaw firmly united ; teeth fixed. 



Teeth of the onter series conical 5. Zoogoneticus. 



Teeth of the outer series usually spear-shaped, sometimes with the 



apices truncate or even notched 6. Limnurgus. 



Teeth of the onter series all distinctly bicuspid 7. Characodo.v. 



B. Rami of the lower jaw weakly connected ; teeth of the outer series 



movable, bicuspid 8. Goouea. 



Ilf. Viviparous. Males with the anal fin advanced and modified into an iutromittent organ, 

 some of the anterior rays being enlarged and produced. Eyes normal. (Pceciliin.e.) 



A. Mouth large, with wide lateral cleft; teeth in bands, slender, 



pointed, depressible 9. Belonesox. 



B. Mouth rather small, with short lateral cleft; rami of lower jaw firmly united; teeth in 



bands, with an outer series of enlarged, fixed teeth. 



Teeth of the outer series conical 10. Gambusia. 



Teeth of the outer series chisel-shaped 11. Glakidichthys. 



C. Mouth small, transverse; rami of lower jaw weakly connected ; teeth unicuspid. 



1. Teeth in a single series 12. Girardinus. 



2. Teeth in bands, with an outer series of larger teeth. 



Dorsal fin with 8-11 rays, higher but not much longer in the males tlian 



in the females ; caudal rounded or subtruncate in both sexes . . . 13. Poscilia. 



Dorsal fin with 12 to 16 rays, higher and considerably longer ia the males 

 than in the females ; caudal rounded or subtruncate, sometimes witii 

 the lower angle a little produced in the males 14. Mollienisia. 



Dorsal fin with 11 to 15 rays, higher but not much longer in the males 

 than in the females ; lower rays of the caudal, in the males, produced 

 to form a long pointed appendage 15. Xiphophorus. 



IV. Viviparous. Males with the anal fin modified into a conical scaly 

 iutromittent organ with terminal orifice. Eye transversely divided 

 into two parts. (Anablepsin.e.) 16. Anableps. 



1. FUNDULUS, Lacep., 1803. 



Hapluchilus (part.) and Fundulus, GLinth. Cat. Fish. vi. pp. 310 & 318 (1866). 



Fuadalus and Adinia (part.j, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, pp. 633 & 660. 



Oviparous. Moutli rathor small, with short lateral cleft; rami of the lower jaw flrmly united ; teeth pointed 

 ill bands, with an outer scries of more or less strongly enlarged, curved, conical teeth. Jives with free 

 m.-U'gins. ..... 



Tliis genu.s comprises a large number of species, mostly North American, some of 

 which are marhie. A few forms occur in the rivers of Mexico and Central America, 

 and the genus is also represented in Africa and Southern Europe. In my synopsis of 

 the species 1 include some which have been described from the coast of Lower 



