THE CYPRINODONTS. 145 



Cynolebias maculatus. 



CynoleUas maculatus Steind., 1881, Denk. Ak. Wien, XLIV, extr. p. 9, pi. 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., 1. c., 651; Eig., 1. c, 65. 



D. 17-20; A. 22-23 ; V. 9 ; P. 13; LI. 30-35; Ltr. ca. 14. 



Sliape 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. Bdhttii. 



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 III. Fig. 9-11, teeth. 



Orestias Valenciennes, 1839, L'Institut, VII, No. 276, 118, — 18i6, C. V. Hist. Poiss., XVIII, 221 ; 

 Dum., 1856, Ichth., 226, 441; Blkr., 1860, Ind. Cypr., 483,-1863, Atl. Icbtli., Ill, 140; Gthr., 1866, 

 Cat., VI, 328, — 1880, Intr., 615. Orestiasini Blkr., 1860, lud. Cypr., 483. Orestiasifonnes Blkr., 1863, 

 Atl. Ichth., Ill, 140. OresUina 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 tlr 

 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 ; 



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