THE CYPRINODONTS. 53 
Body short, much compressed ; caudal pedicel deep; head depressed, 
crown flattened. Snout short, broad, blunt; chin steep. Mouth wide, open- 
ing upward ; lower jaws short, weak, loosely joined; upper shorter than 
lower, protractile. An outer series of slender, spatuliform, or oar-shaped, 
hooked, movable teeth on each jaw, and behind these a band of very small 
one to three cusped teeth. Branchiostegal rays five. Dorsal and ventrals 
small. Dorsal origin behind the middle of the body, excluding the caudal. 
Caudal deep, convex on hind margin. Anal opposed to the dorsal or farther 
forward, modified in the male to form a short intromittent organ, about as, 
long as the head. Scales large. Intestine long, much convoluted. Type 
Peeilia vivipara Bl. Schn., P. Schneideri Val. 
West Indies ; Mexico ; Central America to Brazil. 
Pecilia vivipara. 
Plate V. Fig. 4,7, teeth; Plate VIII. Fig 11, male. 
Pacilia vivipara Bl. Schn., 1801, Syst., pp. lii, 452, pl. 86, f. 2; Goldf., 1820, Handbuch, IT, 16; Flem., 
1822, Phil. Zool., II, 386; M. & Tr., 1848, Schomb. Guiana, IT], 632; Blk., 1860, Cypr., 486, — 1863, 
Atl, ITI, 140; Pet., 1864, Mb. Brl. Ak., 395; Gth., 1866, Cat., VI, 344; Jor., 1887, P. U. S. Mus., IX, 
564; Eig., 1891, P. U. S. Mus., XIV, 65. 
Pecilia Schaeideri Val., 1828, Humb. Obs., IT, 159, — 1846, C. V. Poiss., XVIII, 135; Wagn., 1828, 
Isis, XXI, 1054; Rich., 1837, R. Brit. Assoc., 213; Blk., 1860, Cypr., 486. 
Pacilia surinamensis Val., 1828, Humb. Obs., II, 158, pl. 51, f. 1, — 1840, R. An., ed. ill., Poiss., 227, 
pl. 95, f. 1, — 1846, C. V. Poiss., XVIII, 120; Wagn., 1825, Isis, XXI, 1054; Duv., 1844, Ann. Sc. Nat., 
I (3), 313; Pet., 1864, Mb. Bri. Ak., 396; Eig., 1891, P. U. S. Mus., XIV, 65. 
Pacilia unimaculata Val., 1828, Humb. Obs., II, 158, pl. 51, f. 2, 5, 6, — 1846, C. V. Poiss., XVIII, 
128; Wagn., 1828, Isis, XXI, 1054; Jen., 1842, Beagle Zool. Fish, 114; Gth., 1866, Cat., VI, 346; Kner, 
1867, Novara Fische, 345; Hens., 1868, Arch. f. Naturg., XXXIV, 358, — 1869, Arch. Nat., XXXV, 89; 
Mart., 1876, Preuss. Exp. Zool., I, 37, 401; Steind., 1881, Denk. Ak. Wien, XLIV, extr. p. 9; Eig., 1881, 
P. U. 8S. Mus., XIV, 65. 
Pacilia unipunctata Guer., 1838, Icon. Poiss., 28, pl. 47, f. 3. 
Molinesia surinamensis Pet., 1844, Bericht Bri. Ak., 36; Blk., 1860, Cypr., 485. 
Pacilia uximacula Blk., 1860, Cypr., 486. 
Girardinus versicolor Gth., 1866, Cat., VI, 352. 
Heterandria versicolor Jor., 1887, P. U. 8. Mus, TX, 563. 
Pacilia vivipera pore Big., 1894, Ann. N. Y. Ac., VII, 629. 
B. 5; D. 8-9; A. 9-10; V. 6; P. 14-15; Ll. 26-28; Ltr. 8; Vert. 
14+14. 
Body stout, short, thick, flattened above the shoulders, deep and narrow 
in the caudal section. Head short, one fourth of the length to the base of 
the caudal, much less than the height of the body, as broad as deep, flat on 
the crown. Snout broad, short, length half of the width of the forehead, 
nearly as long as the orbit, subtruncate ; chin moderately steep. Mouth 
wide, one and one half times the eye, directed upward; jaws weak, loosely 
