THE CYPRINODONTS. 145 
Cynolebias maculatus. 
Cynolebias maculatus Steind., 1881, Denk. Ak. Wien, XLIV, extr. p. 9, pl 5, fig. 3; Perug., 1891, 
Ann. Mus. Civ. Gen., (2) X, 651; Eig., 1891, P. U. S. Mus., XIV, 65. 
Cynolebias robustus Gthr., 1883, Ann. Mag., (5) II, 140; Perug., lL. c., 651; Eig., lL. c., 65. 
D. 17-20; A. 22-23; V.9; P. 13; Ll. 30-35; Ltr. ca. 14. 
Shape similar to that of the preceding; dorsal and anal shorter and 
farther from the head. Greatest depth, about the middle, over the ventrals, 
two and two thirds times in the length without the caudal, equal one and 
one third times the length of the head. Head three tenths of the body with- 
out the caudal, its greatest width one and two fifths times in its length. 
Eye nearly four times in the head, twice in the forehead. Mouth horizontal, 
maxillary reaching below anterior margin of eye; lower jaw prominent, 
bulky; symphyses firm. Anterior nostril tubular. Snout blunt, as long as 
eye. Teeth in bands, subconical, hooked, outer series larger. Origin of 
dorsal about midway from opercle to base of caudal; origin of anal little 
farther forward. Pectoral not quite as long as head, not reaching anal. 
Ventrals near the anal, close together, larger than those of C. Bellottii. 
Violaceous to brown, with or without small spots of brownish in more or 
less irregular series; smaller spots on dorsal and anal, Apparently the 
colors darken, and the spots are lost with age. A dark band through the 
eye, as in C. Bellottii, is present on the maculate specimens, which suggests 
a closer relationship between these species than we are at present able to 
establish. Giinther’s specimen measured three and three fourths inches. 
La Plata. 
ORESTIAS. 
Plate 111, Fig. 9-11, teeth, 
Orestias Valenciennes, 1839, L’Institat, VII, No. 276, 118, — 1846, C. V. Hist. Poiss., XVIII, 221; 
Dam,, 1556, Ichth., 226, 441; Bikr., 1860, Ind. Cypr., 483, — 1863, Atl. Ichth., IL], 140; Gthr., 1866, 
Cat., VI, 3258, — 1880, Intr., 615. Orestiasiné Blkr., 1860, Ind. Cypr., 483. Orestiariformes Blkr., 1863, 
Atl. Ichth., LI[, 140. Orestiinew Gill, 1894, Mem. Nat. Acad., VI, 133 
Excepting the absence of the ventral fins, in this genus young specimens, 
up to medium size, resemble Funduli; on larger ones of some species the 
head becomes swollen and angular, and bears a likeness to Uranoscopi. The 
mouth is directed upward, and varies from small to large; the lower jaw is 
prominent, the upper protractile. All of the teeth are small, subconical, and 
hooked ; on the jaws they are placed in a single series or in a narrow band; 
19 
