. Contributions to North American Ichthyology [microform] : based primarily on the collections of the United States National Museum. Ichthyology; Fishes, Fresh-water; Fishes; Ichtyologie; Poissons d'eau douce; Poissons. PLACOPHARYNX CARINATUS. 109 tlie posterior extremity of tliis ridge appears in some PtychostomL Orbit lougit'uliiially oval, times in length of head, twice in interorbital width. Type, fourteen inches in length. "Color in alcohol like that of other species, uniform straw or whitish silvery. "The pharyngeal bones of this species are much stouter tluin those of othe
. Contributions to North American Ichthyology [microform] : based primarily on the collections of the United States National Museum. Ichthyology; Fishes, Fresh-water; Fishes; Ichtyologie; Poissons d'eau douce; Poissons. PLACOPHARYNX CARINATUS. 109 tlie posterior extremity of tliis ridge appears in some PtychostomL Orbit lougit'uliiially oval, times in length of head, twice in interorbital width. Type, fourteen inches in length. "Color in alcohol like that of other species, uniform straw or whitish silvery. "The pharyngeal bones of this species are much stouter tluin those of other species of its own greater size, e. g., Pt. aureolun of eighteen inches, where they are comi)aratively slight. The exteroposterior ala is twice as wide as the body inside the teeth is deep, and but for its short base and narrowed tip would do for that of a Semotilus. But while there are seven broad teeth without heel or cusp otf the basal half, there are at least forty on the distal half, they becoming more compressed and fiually like those of other allied genera. There are fourteen with trun- cate extremities. The pharyngeal plate has narrow horns directed up- wards and forwards, and is thickened medially. It is placed immedi- ately in advance of the opening of the oesophagus. I have but one specimen of this curious species, which I obtained at Lafayette, on the Wabash River, in ; T!ie writer has in his collection two young speci s obtaiiiecl in Illi iiois Kivcr by Prof. Bray ton, a skeleton of a very large individual found in Scioto Ilivcr by Dr. J. W. Wheaton, and a pair of pharyngeal bones taken by Dr. G. M. Levette from a fish taken in the Wabash at Tt'ire ITiMite. I have also seen a pair of |)h!iry:igeals and an air-bladder (il ('lie â lUcn ill Dciii ii I>iv>r by Professor Baird, and now in the United States ^National Museuin, and a jaw from '* Post-i)lii)cene " deposit; near the Falls of the Ohio, found by Dr. John Sloan. The Jaws and air-
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Keywords: ., bookce, bookdecade1870, booksubjectfishes, booksubjectichthyology
