. 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. iji* -y,y .. GENUS PLACOPHARYNX. 107 r Genus PLACOPHARY^^X Cope. Placopharynx Cope, Proc. Am. Philos. Soc. Phila. 4G7, 1870. Type, Placopharynx carinatus Cope. Etymology, n?iu§, a, broad eiirface ; (jitipvyl, pharynx. Suckers like Myxostoma iu all retspects, except tbat the pharyngeal bones are much more developed, aud the teeth reduced in number, those on the lower hal
. 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. iji* -y,y .. GENUS PLACOPHARYNX. 107 r Genus PLACOPHARY^^X Cope. Placopharynx Cope, Proc. Am. Philos. Soc. Phila. 4G7, 1870. Type, Placopharynx carinatus Cope. Etymology, n?iu§, a, broad eiirface ; (jitipvyl, pharynx. Suckers like Myxostoma iu all retspects, except tbat the pharyngeal bones are much more developed, aud the teeth reduced in number, those on the lower half of the boue very large, C to 10 in number, nearly cylin- (Iric in form, being but little compressed, and with a broad, rounded or fliitteued grinding surface. The forms and positions of tiiese en- larged teeth vary greatly. In a specimen before me, the Hrst tojth is the highest and most compressed, its summit being rounded and then abriii)tly truncate. The second tooth is notably shorter and thicker, much larger, and rounded on top, the body of the tooth serving as a pe- duncle for the swollen grinding surface. The third tooth is still shorter aiid similar in form. The fourth tooth is similar to the first, being much higher than the second and third, and flat on top. The others seem to be irregularly alternated or arranged in pairs, a long cne aud a sLort one, the long teeth in all cases being the most truncated, as if their sur- tiices had been njost worn off. As I have at present no perfect specimens of this genus, nothing but very young specimens, and pharyngeal jawa of adults, I cannot do Detter than to copy Professor Cope's original descriptjoii, which seems to be an accurate one. I substitute the generic names used in this paper [SlyxnHtoma, t'tc.) for those used by Professor Cope (PtyckoHlomun, etc.), whenever u difference occurs :â "Allied to iMyxofttoma. The pharyngeal teeth much reduced in num- jber, only siuen on the proximal half of the bone, cylindric in
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