632 Bulletin 47, United States National Museum. 



lc. Incisors bicuspid, with a band of villiform teeth behind thm; body rather 



deep, the vertical fins moderately developed. CHARACODON, 306. 



Tck. Incisors tricuspid, in 1 row, with no villiform teeth behind them; body 



short and deep, compressed. 



Z. Dorsal fin short, of 10 to 12 rays, the first ray slender and rudimentary. 



CYPRINODON, 307. 



II. Dorsal fin very long, of 16 to 18 rays, the first ray developed as a stout, 

 grooved spine. JORDANEU,A, 308. 



~bb. Anal fin in the males placed well forward and modified into a sword-shaped intro- 

 mittent organ; teeth all pointed, arranged in bands. Species viviparous, the 

 young of large size at birth. 

 GAMBUSIIN;E : 

 TO. Eye normal, the pupil not divided by a partition; dorsal inserted more or less 



behind front of anal, 

 n. Jaws not produced into a beak, lower jaw prominent, longer than upper; 



male fish very much smaller than the female, 

 o. Dorsal fin long, of 14 to 16 rays; anal short. 



PSEUDOXIPHOPHORUS, 309. 



oo. Dorsal fin short, of 6 to 10 rays; anal short. GAMBUSIA, 310. 



nn. Jaws produced into a moderate beak, much as in Labidesthes; dorsal and 

 anal short. BELONESOX, 311. 



ANAULEPINJE : 



mm. Eye divided into 2 portions by a horizontal cross partition ; vertical fins short; 



body elongate. ANABLEPS, 312. 



aa. Intestinal canal elongate, with numerous convolutions; dentary bones loosely joined; teeth 



movable; species chiefly mud-eating. 

 GOODEINTE : 



p. Teeth incisor-like, all tricuspid, in 1 series, with a series of villiform teeth behind 



them; sexual characters unknown, the sexes probably alike; lower jaw projecting. 



q. Fins small; scales large; form oblong. GOODEA, 313. 



PCECILIIN^E : 



pp. Teeth all pointed; anal fin in the male advanced and modified into an intromittent 



organ; lower jaw short and weak. Species ovoviviparous. 

 r. Teeth in a single series; dorsal and anal both short; scales large. 



s. Dorsal fin inserted in advance of anal. PLATYPCECILUS, 314. 



ss. Dorsal fin inserted more or less behind front of anal. HETERANDRIA, 315. 



rr. Teeth in more than one series. 



t. Dorsal inserted more or less behind anal; both fins very small. LKBISTES, 316. 

 tt. Dorsal inserted over or in advance of anal, its rays much elevated in the male. 

 . Dorsal fin short, of less than 7 to 11 rays. 



v. Teeth of inner series in both jaws trifid. ACROP(ECILIA, 317. 



vv. Teeth of inner series in both jaws entire. P(ECILIA, 318. 



. MM. Dorsal fin long, of 12 to 16 rays. 



w. Caudal fin normal, alike in both sexes, or with the lower angle 

 merely sharp in the male. MOLLIENISIA, 319. 



ww. Caudal fin in the males with its lower lobe much produced and sword- 

 shaped, in the adult as long as rest of body. 



XIPHOPHORUS, 320. 



300. FUNDULUS, Lacepede. 



(KlLLIFISHES.) 



Fundulm, LACEPEDE, Hist. Nat. Poiss., v, 37, 1803, (mudfish). 

 Hydrargira, LACKPEDE, Hist. Nat. Poiss., v, 378, 1803, (swampind). 

 f Aplocheilus,* MCCLELLAND, Ind. Cypr. As. Res., xix, 301. 1839, (chrysostigmus = panchax). 



* We question the reference of Aplocheilus and Panchax to Fundulu*, because the East Indian 

 species, Aplocheilus panchax, the type of both nominal genera, has a long, depressed snout, and a 

 physiognomy unlike the American species. According to Giinther, its vomerine teeth are 

 minute and rudimental. There are no vomerine teeth in the species of Fundulus. 



