49. CYPRINODONTID^E JORDANELLA. 327 



66. Teeth Jill pointed ; ventrals present. (Fundnlincc.) 



e. Teeth in more than one scries ; air-bladder present. 

 /. Dorsal fin comparatively large and well forward, its rays usually more 



than 11 and the first ray usually in front of the 



anal FUNDULUS, 158. 



ff. Dorsal fin small and posteriorly placed, its rays usually 7-10, and the 



first ray generally behind the front of the anal. 



g. Anal fin small ZYGONECTES, 159. 



cc. Teeth in one series; dorsal fin in advauce of anal. 



/;. Dorsal and anal fins short, each with 9-13 rays LUCANIA, 160. 



lili. Dorsal and anal fins long, each with more than 20 rays. 



Glrardin ichtliys. 

 aa. Anal fin of the male advanced, modified into a sword-shaped, intronrittent 



organ. (Anablepince.) 

 i. Eye normal ('. e., not divided into two portions by a horizontal 



partition) ; teeth in bands. 

 j. Jaws not produced. 



k. Dorsal fin long, 14-16 rays Pseudoxiphophorus. 



kk. Dorsal fin short, 9-10 rays GAMBUSIA, 161. 



jj. Jaws much produced Eelonesox. 



"* Intestinal canal elongate, with numerous convolutions ; anal fin in the male usually 



modified into an iutroniittent organ ; deutary bones 

 loosely joined ; teeth movable. (Hmnophagce.) 

 L Teeth all pointed. (FcecUiinw.) 



m. Teeth in more than one row ; dorsal more or less in 

 advance of the anal, greatly enlarged in the male. 

 n. Caudal fin in the male with its lower lobe much pro- 

 duced ; dorsal fin long, of 12 or more rays. 



Xiphophorus. 



nn. Caudal fin normal, alike in the two sexes. 

 o. Dorsal fin long, of more than 12 r.iys. 



MOLLIENESIA, 162. 



oo. Dorsal fin short, of less than 12 rays . . PCECILIA, 163. 

 mm. Teeth in a single series ; dorsal fin short. 

 p. Dorsal inserted in advance of anal. 



Platypcccilus. 

 pp. Dorsal inserted posteriorly to anal. 



GIRARDIXUS, 164. 

 11. Teeth incisor-like, tricuspid ( Goodemw} Goodea. 



156. JORB> AMELIA Goode & Bean. 



(Goode & Bean, Proc. U. S. Nat Mus. ii, 177, 1879: type Jordanella floridce G. & B.) 



Body short, deep, compressed. Head short. Month small, very pro- 

 tractile, the lower jaw the longer; lips full. Jaws each with a single 

 series of rather broad, wedge-shaped, incisor teeth, the cutting edge of 

 which is deeply notched, usually trifid. Branch iostegals 5. Dorsal flu 

 elongate, the number of rays 16-18, the first being a robust spine; in- 

 sertion of dorsal fin behind ventrals, in advance of front of anal, its 

 last ray behind the last of anal ; dorsal fin not greatly elevated. Anal 

 fin shorter and smaller, similar in both sexes; ventral fins small, with 

 a scale at base; caudal fin rounded ; pectorals short and small. Intes- 



