1870.] 483 (cove, 
inches. Locality not well ascertained, but as it accompanied species of 
Bubalichthys, it is probably from one of the western States. 
Dedicated to my friend, Dr. John Edw. Gray, for many years the ener- 
getic director of the zoological department of the British Museum. 
Carpiodes thompsonii, Agass. 
Amer. Journ. Sci, Arts, XIX 73. Catostomus cyprinus Thompson, 
Nat. Hist. Vermont. Sclerognathus cyprinus pars Kirtland, Fishes of 
Ohio, Proc. Bost. N. H. Soc. V. 275. 
This is perhaps the handsomest species of the genus, and is distinguished 
by its stout form, numerous narrowly exposed scales, and little elevated 
dorsal fin. The eye is small, entering the length of the head 5.2 times, 
and 2.2 times the interorbital width. The muzzle is more elongate, but 
not so conic as in the two species last described, and projects far beyond 
the nasal crests, having an obliquely truncate profile. Heace the end of 
symphysis mandibulii is much in advance of the line of the nares, and the 
rim of the upper lip just reaches the line of the orbit. 
~ Dorsal line much arched, origin of the first dorsal radii midway between 
end of muzzle and origin of tail. Scales 8—41—6. V. 10, A. VII. Oper- 
culum flat, slightly ridged. Length averaging a foot. Color silvery, with 
a greenish golden band along the middle of each ofthe series of scales 
near the dorsal region, producing longitudinal golden bands. 
Specimens from Lake George and Saginaw Bay, Lake Huron. 
Carpiodes bison, Agass. 
Amer. Journ. Sci. Arts, XVII, 356. 
The original description of this species is rather too brief to allow of a 
perfectly satisfactory determination of my specimens. These are from the 
Wabash, and Tennessee; those described by Prof. Agassiz are from the 
Osage, in Missouri. 
This species has the general form of the buffalo fish, but has not: so 
elevated a dorsal outline. It is therefore, much less elevated than the 
Carpiodes above described. It is especially characterized by the elongate 
form of the muzzle, in which it exceeds any other species of the genus. 
The profile descends obliquely posteriorly from the end of the muzzle to 
the mouth, and the end of the mandible is but little in advance of the 
nares, while the canthus is in line with the anterior limb of the orbit. 
The lips are weil developed for the genus, and delicately longitudinally 
plicate. The eye is large, the middle line of the cranium falling within its 
posterior rim ; in other species it falls posterior to this point. Its diame. 
ter enters the length of the head 4.5 times, and the interorbital width, 
twice. Scales 7—40—5. Pectoral fin barely reaching line of anterior 
dorsal ray. Caudal furcate half its length. 
In general proportions this fish is a good deal like the European carp. 
The occipital region is elevated and narrowly convex. The long dorsal 
ray is almost as well developed as in the species of group first, extending 
