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. 



Fnndulus brasiliensis Ysi., 1828, Hurab. Obs. Zool, II, 163, pi. LII, fig. 2, — 1846, C. V., Poiss., 

 XVIII, 199,-1840, R. An., ed. lU., Poiss., 228, pi. 95, fig. 3; Wagn., 1S28, Isis, XXI, 1056; Guer., 

 1838, Icon. R. An., Poiss., 29, pi. 48, fig 3; Blkr., 1860, Cypr., 486. 



Haplochilus brttsilieusis Gthr., 1866, Cat., VI, 317. 



Rivutus uropIMalmus Gthr., 1866, Cat., VI, 327; Eig., 1891, P. U. S. Mus., XIV, 64,-1894, Ann. 

 N. Y. Ac, VII, 629. 



Rivultts Poryi 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 ; LI. 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 



