49. CYPEINODONTIDiE JORDANELLA. 
327 
bb. Teetli all pointed ; ventrals present. (FtaiduUnw.) 
e. Teeth in more than one series ; air-bladder present. 
/. Dorsal fin comparatively large and well forward, its rays usually more 
than 11 and the first ray usually iu front of the 
anal Fcxdulus, 158. 
ff. Dorsal fin small and posteriorly placed, its rays usually 7-10, and the 
first ray generally behind the front of the aual. 
g. Aual fin small Zygoxectes, 159. 
cc. Teeth in one series ; dorsal fin in advance of aual. 
h. Dorsal and anal fins short, each with 9-13 rays Lucaxia, 160. 
lift. Dorsal and anal fins long, each with more than 20 rays. 
(rirardinichthys. 
aa. Anal fin of the male advanced, modified into a sword-shaped, intromittent 
organ. (Anablepince.) 
i. Eye normal (i. c., not divided into two portions by a horizontal 
partition) ; teeth iu bauds. 
j. Jaws not i^roduced. 
k. Dorsal fin long, 14-16 rays Pseudoxiphophorus. 
kk. Dorsal fin short, 9-10 rays Gambusia, 161. 
jj. J aws much produced Delonesox. 
'** Intestinal canal elongate, with numerous convolutions ; anal fin in the male usually 
modified into an intromittent organ ; dentary bones 
loosely joined ; teeth movable. {Limnopliagos.) 
1. Teeth all pointed. {Poeciliince.) 
in. 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. 
Xiphopliorus. 
nn. Caudal fin normal, alike in the two sexes. 
0 . Dorsal fin long, of more than 12 r.ays. 
Molliexesia, 1G2. 
00 . Dorsal fin short, of less than 12 rays . . Pcecilia, 163. 
mm. Teeth in a single series ; dorsal fin short. 
]}. Dorsal inserted in advance of aual. 
PlaUjpcecilns. 
pp. Dorsal inserted posteriorly to anal. 
Giuardixus, 164. 
U. Teeth incisor-like, tricuspid {Gooddim) Goodea. 
156.— JOBI>AI¥El,I.A Goode & Beau. 
(Goode & Bean, Proc. U. S. Nat Mus. ii, 177, 1879: type Jordanella florida; G. tfe B.) 
Body short, deep, comjtressed. Head short. Month small, very pro- 
traetile, the lower jaw the longer; lips full. Jaws each with a single 
series of rather broad, wedge-shaped, incisor teetb, the cutting edge of 
which is deeply notched, usually trifid. Branchiostegals 5. Dorsal fin 
elongate, the number of rays 10-18, the first being a robust spine; in- 
sertion of dorsal fin behind ventrals, in advance of front of aual, its 
last ray behind the last of anal ; dorsal fin not greatly elevated. Aual 
fill shorter and smaller, similar in both sexes; ventral fins small, with 
a scale at base; caudal fin rounded; xiectorals short and small. lutes- 
