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49. CYPRINODONTIDJL JORDANELLA. 327 



66. Teetli iill i)ointc<l; veutrals prosent. (Fitudiiliiw.) 



e. Teeth iu nioni than one scries; air-bliKhlcr i)resent. 

 /. Dorsal liu comparatively hirge a'.id well forward, its rays usually more 

 tliaii 11 and the first ray usually iu front of the 



anal Fundulus, 158. 



Jf. 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 Z ygoxectes, ir>9. 



cc. Teeth iu one series ; dorsal fin in advance of anal. 



h. Dorsal and anal fins short, each with 9-13 rays Lucania, 160. 



hh. Dorsal aud anal fins long, each with more than 20 rays. 



Girardln ichthys. 

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



organ. (AnahJejnixv.) 

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

 partition) ; teeth in bauds. 

 j. Jaws not produced. 



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



kk. Dorsal fin short, 9-10 rays Gamijusi a, 161. 



jj. Jaws much ])roduced Belonesox. 



Intestinal canal elongate, with uumerous convolutions ; anal fin in the male usually 



modified into an intromittent organ ; deutary bones 

 loosely joined ; teeth movable. {Limnoph^fjce.) 



I. Teeth all pointed. (rceciUhuc.) 



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

 advance of the anal, greatly enlarged iu the male. 

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

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



Xiphophoriis. 

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

 0. Dorsal fin loug, of more thau 12 r.-iys. 



Molliexesia, 162. 

 00. Dorsal fin short, of less than 12 rays . . Pcecilia, 163. 

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

 p. Dorsal inserted in advance of anal. 



PlatypcBoilus. 

 pp. Dorsal iuserted posteriorly to anal. 



(ilUARDIXUS, 164. 



II. Teeth incisor-like, tricuspid ( Goodeinw) Goodea. 



156.— JORWANE1.1.A Goode »fc Beau. 



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



Body short, deep, coinjjressed. Head short. ]\Iouth small, very pro- 

 tractile, the lower jaw the longer; lips liill. Jaws each with a siiiyle 

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

 which is dce])ly notched, usually triiid. Branchiostegals 5. Dorsal iin 

 elongate, the number of rays 1(>-18, the iirst being a robust si)ine; in- 

 sertion of dorsal fm belli nd ventrals, in advance of front of anal, its 

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

 fin shorter and smaller, similar in both sex(;s; ventral fins small, with 

 a scale at basej caudal liu rounded j pectorals short aud small, lutes- 



