. 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. GENUS CATOSTOMUS. 155 ill'lj rays; tail equally forked. Besides the two fullowiug species (0. duguesnii; ) the C. boatonienaia and C. hudsoniua must be enumerated beie,"—(Rafinesque, Ich, Oh. p. 60.) Hypentelium Rafinesque, 1820.—" Body pyramidal slightly compressed, with very minute scales. Vent posterior. Head scaleless, nearly square, mouth terminal pro-
. 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. GENUS CATOSTOMUS. 155 ill'lj rays; tail equally forked. Besides the two fullowiug species (0. duguesnii; ) the C. boatonienaia and C. hudsoniua must be enumerated beie,"—(Rafinesque, Ich, Oh. p. 60.) Hypentelium Rafinesque, 1820.—" Body pyramidal slightly compressed, with very minute scales. Vent posterior. Head scaleless, nearly square, mouth terminal pro- truded beneath toothless, jaw shorter with five lobes, the middle one larger, lips very small. Abdominal tins anterior removed from the veut, dorsal iiu anterior, opposed to them. " This genua belongs to the family of the Cyprinidia, and is next to my genus Exoglos- lunt, with which I had uuittd it; but this last ditlers from it by au oblong body, tl > ces genres par leurs dents phar'Ugieuucs. "Par la formo gdudrale de leur corps, ils ressemblent b. nos barbeaux [L'arduM], dont ils out presque tous la t6te alongdo, lisse et nue, et lo museau uu pea produiiuent, mais ils u'ont pas leurs barbillons, et la dorsale ninnquo do rayons dpineux et denteld.^. La buucho est situde sous le museau ; elle est sant: dents, ct les 15vres, dlargies, lobdes, caroiiculdes, nuvis sans prolongucmeut,'^ filiformes, servent ii coustituer uuo sorto do veutouse au moyeu de laquello ces poissons peuveut adherer ou sucer. Les pliaryngieus Dout grands et arquds, presque en demi-cerele ; tout le bord interne est garni de dents comprimdus, ik cuuronue stride, un pen plus largo que la base; toutes ces dents dd- croi-stint regulitiremont dopuis les iuferidures jusqu'aux smdiieures,le nombre en varie wlou les esp^ces; elles formeut un peigne sur le corps I'os. Lea opercules sont ; 1m nnrincs out chacuno, connno i\ I'ordinaire, deux ouvertures rapprochdes:. les yeux !M>z largos, son
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