Family XL Pceciliid^. 



99 



b. A few of the anterior teeth in each jaw much page 



enlarged, canine-like Cynodonichthys 101 



bb. Anterior teeth in each jaw subequal, none 

 canine-like, 

 o. Outer series of teeth enlarged, pointed, or a 

 few of the anterior ones compressed, incisor- 

 like, none of them notched, bicuspid or tri- 

 cuspid, 

 d. Anal fin of the male similar to that of the 

 female; pharyngeal bones and teeth not 

 enlarged; species oviparous. , 



e. Teeth in more than one series, usually a 

 larger outer series, behind which is a band 

 of smaller teeth ; no caudal ocellus ; body 

 oblong; dorsal fin variable in size and in- 

 sertion Fundulus 102 



ee. Teeth arranged in a single series; dorsal 

 fin inserted in advance of anal, its rays 9 



to 13 Lucania 109 



dd. Anal fin of the male with its first five or six 

 rays short and stiff, and slightly separated 

 from the rest of the fin by a shallow notch ; 

 species viviparous, the young usually of 

 large size at birth. 



f. Dorsal and anal fin each of less than 18 

 rays; body elongate, not much com- 

 pressed Zoogoneticus 109 



ff. Dorsal and anal fins each of 19 or more 



rays ; body compressed Girardinichthys 1 1 5 



cc. Outer series of teeth incisor-like, bicuspid 

 or tricuspid. 



g. Outer series of teeth bicuspid with a 

 band of villiform teeth behind them. 

 h. Intestinal canal about 1 1 / 2 in total length 



of body; the teeth very firmly attached . .Characodon 118. 

 hh. Intestinal canal about 2 in total length 



of body; teeth less firmly attached. . . .Chapalichthys 123 

 gg. Outer series of teeth tricuspid, no villi- 

 form teeth behind them; dorsal fin short, 

 of 10 to 12 rays, the first ray slender 



and rudimentary Cyprinodon 124 



ddd. Anal fin of the males placed well forward 

 and modified into a sword-shaped intro- 



