THE CYPRINODONTS. 135 
outer series larger and in open order, inner small, in bands, Eye large, 
nearly four and a half times in the head, twice in the interorbital space. 
Scales large, thin. Dorsal fin small, base originating near two thirds of 
the distance from the occiput to the caudal, over the middle of the anal, 
and extending back about as far as that of the last, varying in position in 
individuals. Ventrals very small, not reaching the anal. Pectorals small, 
reaching more than half way to the ventrals. Caudal large, fan shaped, 
rounded on the margin, scaly on the base. 
Olivaceous, uniform or with darker mottlings or cloudings, centres of 
scales darker; fins more or less clouded with fine puncticulations, sometimes 
tipped with darker; an ocellate spot of black on the bases of the caudal rays 
in the upper half of the fin. The females examined measure one and six 
tenths inches, the males but one and one tenth. 
Cuba. 
Rivulus brasiliensis. 
Plate III, Fig. 12, teeth. 
Pundulus brasiliensis Val., 1828, Humb. Obs. Zool., IT, 163, pl. LIT, fig. 2, — 1846, C. V., Poiss., 
XVIII, 199, — 1840, R. An., ed. Ill., Poiss., 228, pl. 95, fig. 3; Wagn., 1828, Isis, XXI, 1056; Guer., 
1838, Icon. R. An., Poiss., 29, pl. 48, fig 3; Blkr., 1860, Cypr., 486. 
Haplochilus brasiliensis Gthr., 1866, Cat., VI, 317. 
Rivulus wrophthalmus Gthr., 1866, Cat., VI, 327; Eig., 1891, P. U. S. Mus., XIV, 64, —1894, Ann. 
N. Y. Ac., VII, 629. 
Rieulus Poeyi Steind., 1876, Sb. Ak. Wien, LXXIV, extr. p. 117; Eig., 1891, 1. c., 64. 
B.6; D. 6-7; A. 12-13; V.6; P.14; Ll. 42-43; Ltr. 10-11; Vert. 
15+ 19. 
Moderately elongate, compressed toward the tail, depressed on head and 
nape, depth one fifth of the length without the caudal. Head two ninths of 
the length to the tail, broad, flattened on the crown. Snout shorter than the 
eye, bluntly rounded. Mouth medium, nearly horizontal in the cleft, lower 
jaw prominent. Teeth subconical, hooked, outer series larger, in open order, 
inner smaller, in bands. Eye large, one fourth of head, one half of inter. 
orbital space, Dorsal small, origin three fourths of the distance from eye to 
base of caudal, extending above several of the hindmost rays of the anal 
(varying in this respect in individuals). Ventrals very small, not reaching 
the anal. Pectorals small. Caudal as long as the head, rounded on the 
margin. 
Olivaceous to brownish or reddish, with a lighter dark edged band on 
the back, possibly lost with age, clouded more or less on the flanks. Belly 
