a 
THE CYPRINODONTS. 59 
base of the caudal. Snout broad, subtruncate, nearly or quite as long as the 
eye. Mouth moderately wide, directed upward ; lower jaws longer, loosely 
joined ; upper shorter, protractile. Outer series of teeth slender, movable, 
narrowed toward the base, widened toward the apex, hooked; inner in 
bands, small, tricuspid. Eye large, about as long as snout or longer in 
young, half of interorbital space, two sevenths of head. Fins medium, ex- 
cepting caudal, which is large. Dorsal origin little behind the middle of the 
length, without the caudal. Anal origin a short distance behind that of dor- 
sal in females ; fin advanced and modified in males, process shorter than head 
and bearing a short fleshy lobe below its extremity. The first ray of the 
dorsal is a trifle farther forward in the male, and the fin is higher and 
broader. Ventrals small, second ray elongate in males. Caudal deep, nearly 
as long as head, truncate. Scales large. Intestine long. 
Olivaceous, darker on back and top of head, lighter to silvery downward 
‘on the flanks and beneath, edges of scales darker. Cheeks silvery. With or 
without vitte, formed by a spot on each scale of one to several series, on the 
middle of the flank. Without or with vertical narrow bars of brownish on 
the sides, a longitudinal silvery streak, or a brownish tint along the middle 
of the flank. Fins plain to puncticulate or spotted with black, or dorsal and 
caudal with one to several irregular transverse series of spots. In the breed- 
ing season the dorsal of the male becomes longer; in cases it reaches the 
short rays of the caudal and the fin is blotched with black and yellow. Some 
individuals have large irregular blotches of black scattered over the sides. 
Largest female four and one fourth and largest male two and one eighth 
inches, Cuba. 
Pocilia sphenops. 
Plate IV. Fig. 13, teeth. 
Pacilia sphenops Val., 1846, C. V. Poiss., XVIII, 130, pl. 526; Blk., 1860, Cypr., 486; Gth., 1866, 
Cat., V1, 343; Eig., 1893, P. U, S. Mas., XVI, 57. 
Limia couchiana Gri, 1859, P. Phil. Ac., 116. 
Gambuasia couchiana Bik, 1860, Cypr., 485 
Peacilia couchii Gth., 1866, Cat., VI, 347; Eig., 1893, P. U.S. Mus., XVI, 57. 
Mollinesia couchiana Jor. & C., 1877, B. Baf. Soc., IIL, 142; Jor., 1878, B. U. S. G. Sar., TV, 434. 
Pacilia couchiana Jor., 1887, KR. U. S. PF. Com., 838; Everm. & K., 1894, B. U.S. F. Com., pp. 76, 
84, 87, $9, 92, 108. 
Pacilia mericana Steind., 1863, Sh. Ak. Wien, XLVITI, 178, pl. TV., fig. 1, 1a; Gth., 1866, Cat., VI, 
340; Trosch., 1865, Syst. Wirb. Mex., 104; Eig. 1993, P. U. S. Mus., XVI, 57. 
Pavilia thermalis Steind., 1863, Sb. Ak. Wien, XLVIII, 181, pl. 4, fig. 3,3a; Troseb., 1865, Wirb. 
Mex., 104; Gth., 1866, Cat., VI, 341; Eig., 1893, P. U.S. Mus., XVI, 57. 
Gambutia modesta Trosch., 1865, Wirb. Mex., 105 
Gambusia plambea Trosch., 1565, Wirb. Mex, 106. 
