THE CYPRINODONTS. 155 
Orestias Jussieui. 
Orestias Jussici Val., 1846, C. V. Poiss., XVIII, 235, pl. 535; Gthr., 1866, Cat., VI, 329; Big., 1891, 
P. U. S. Mus., XIV, 65. 
Orestias Jussiewi Cast., 1855, Exp. Am. Sud, Poiss., pl. 27, fig. 8; Blkr., 1860, Cypr., 487. 
D. 14; A. 18; P. 14; C. 28. 
In being short and considerably arched in front of the dorsal, as figured 
by Cuvier and Valenciennes, this species resembles 0. aus and O. luteus, 
from which it is easily distinguished by its smooth scales. Between it and 
O. Agassizii the differences in arch of back and shapes of crown and snout 
are very marked. Length of head less than depth of body, little less than 
one third of body without caudal. Crown flattened. Snout massive, twice 
as long as eye. Mouth large, cleft descending much below the level of the 
eye, oblique. Eye half as long as snout, one-sixth the length of head. 
Seales on back forward from the dorsal, and on head and cheeks large, 
thick, smooth. Suborbital, cheek, and opercle covered with scales. Largest 
scales above the pectorals. Behind those that are enlarged the scales are 
thin and bear concentric striw. Ventral surface naked anteriorly. Color 
yellowish green, fins pale. Described from four inch specimens. 
Valenciennes says his examples came from Titicaca, Guasacona River, 
and the Lake Chinchoro, near Cuzco, The dimensions given suggest that he 
had two species in hand, for part of his details, in regard to crown and 
length of head, apply to O. Agassiz and not to the form he figures as 
O. Jussieu. 
Orestias Inc® sp. ». 
Plate IIL. Fig. 9, teeth, 
B. 5; D.16-18; A. 16-18; P.18-20; LI. 32; Ltr. 16-17; Vert. 13+ 18. 
Body much compressed, depth two fifths of length, without caudal, or one 
third of total, highest point at first rays of dorsal, nearly straight from snout 
to dorsal fin. Head narrow, higher than deep, little less than one third of 
total length ; crown a trifle convex transversely, straight, back becoming 
slightly arched behind occiput. Snout medium, as long as eye, blunt, broad. 
Mouth small, vertical, cleft downward almost to lower level of eye. Eye 
large, as long as snout, two sevenths of head, not quite as wide as inter- 
orbital space. Teeth few, simple, hooked, apparently in a single series, 
Pharyngeal teeth stout, with a shoulder. Seales mediam, not granulate, 
