EXPLOITATIONS ACROSS THE GREAT BASIN OF UTAH. 



HOrLADELUS OL1VARIS, Gili. 



Synonymy. 



liaf. American Monthly Magazine and Critical K< view, vol. iii, p. 355, Sept., 1818. 

 iaf. loc. cit. vol. iii, p. 447 (Oct. 1818), and vol. iv, p. 107 (without description), 

 us liaf- Journal of the Royal Institution, vol. ix, p. 50, April, 1820. 



> /,'„/. IchthyologiaOhiensis. p. 61, July, 1820. 



«Ufl liaf. [ohthyologia ohiensis, p. 64. 



s /;„/ i.-hthyologia Ohiensis, p. 66. 



re liaf. Ichthyologia Ohiensis, p. 67. 



FLATUS Val. Hist. Nat. des Poissons, vol. xv, p. 134, 1840. 



: Val. Hist. Nat. des Poissons, vol. xv, p. 135 (abstract). 



l-i-atvs De Kay, Zoology of New York Fishes, p. 187 (abstract), 1842. 



De Kay, Zoology of New York Fishes, p. 187 (abstract). 



t.Aii s Stnn-r, Synopsis of Fishes of North America, p. 151; ib. in Me 



Storer, loc. cit. (abstract). 

 •s Stonr. Synopsis of Fishes of North America, p. 152; ib. in Memoir 



The body is greatly elongated, and from a lateral view appears to be very slender, 

 slowly diminishing in height toward the caudal; above, it is very much depressed 

 anteriorly, and is rapidly attenuated toward the caudal. The greatest height in front 

 of the dorsal fin is about a seventh of the entire length, while that of the caudal 

 peduncle behind the anal and adipose tins equals a half of the greatest, or a fourteenth 

 of the length. The width at the base of the pectorals is about a third greater than 

 the heigth, and equals a fifth of the length; thence it rapidly diminishes to the caudal 

 peduncle, which, at the base of the fin, is very thin and compressed. 



The head, from the projecting lower jaw to the membranous opercular margin, 

 forms little more than a fourth of the entire length. In profile, is elongated conical, 

 or cuneiform, the extreme height at the pectorals being a half of the head's length. 

 Above, the head is oblong, and very flat and depressed. The greatest width equals 

 a fifth of the entire length of the fish, and the eyes a sixth of the same. The sides 

 of the head are slightly convex: otherwise the width nearly equally diminishes to the 

 snout, which is wide and truncated. 



The eyes are oval and small, the longest diameter not exceeding a tenth of the 

 length of the head. Their distance from a transverse line parallel with the front of 

 the snout equals three diameters. The interval between each other equals half of the 

 greatest width of the head. Seen from above, they appear to be distant about a 

 diameter from tlie side of the head. 



The maxillary barbels are small and slender, compressed at their base, and with 

 the internal edge rounded. They vary in length, but do not generally much exceed 

 half the length of the head. In one, the barbel on the left side extends to the base 

 of the pectoral. The nasal barbels extend to about the posterior margin of the eye. 

 The inframaxillary ones form the four angles of a transversely-elongated hexagon; the 

 distance between the internal ones is nearly a sixth of the head's length, and that 

 between the external ones exceeds a third of the same (^). The latter are about 

 half as long as the maxillary, and about twice as long as the internal ones. 



