. 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. m -rrr'lT^ N1 ETHEOSTOMATID-S:. â 'r*|'.-it-**yY^***»^^--',^^,'' I The piincipal characters separating Ericosma from Alvordius are shown below. - - - Alvordius, Grd. (Type, A. mamlatua Grd.) Vertebrse numerous, about 44 iu all; 22 in front of anus. Body and head elongate; mouth wide, with well-developed teeth on vomer and on palatines. Sexes similar; males never with the fins
. 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. m -rrr'lT^ N1 ETHEOSTOMATID-S:. â 'r*|'.-it-**yY^***»^^--',^^,'' I The piincipal characters separating Ericosma from Alvordius are shown below. - - - Alvordius, Grd. (Type, A. mamlatua Grd.) Vertebrse numerous, about 44 iu all; 22 in front of anus. Body and head elongate; mouth wide, with well-developed teeth on vomer and on palatines. Sexes similar; males never with the fins tuberculate. Dorsal spines 12 to 15; the two dorsal flns well apart. Caudal fin slightly emargiiiate. Ericosma, Jordan. (Type, Alrordius evidea Jor. & Copei.) VertebrjB fewer, about 39 in all; 17 in front of anus. Body short and compact; mouth small, with about six minute teeth on vomer and none on palatines. Sexes dissimilar; the males bril- liantly colored, with the lower tins tuberculate. Dorsal spines 10 or 11; the two fins contiguous. Caudal tin deeply emargiiiate. 6. RHEOCRYPTA, Jordan, gen. nov. Allied to ImoHtotna and Alvordiua. Body rather slender and i'longate, with a pretty large, rather long, and somewhat narrowed head, resembling that of BoleoHoma; mouth small, horizontal, subin'erior, with weak teeth in jaws, five or six small teeth on the vomer, and none on the palatines; upper jaw protractile, separated by a distinct furrow tVoin the forehead; two distinct dorsal fins, of which the second is rather smaller than the first and than anal; anal with two distinct spines; ventral region with a series of plates, as in Ahordinx and /Vr- cinn, these caducous, in many specimens replace«l by ii scaleless strip; cheeks naked ; operdes wiih a few scales; lateral line complete. This genus is perhaps nearest Imostoma^ with which it agrees in the protractile mouth. It differs from Imnstoma antw, to flow rapidlyâxpnrroi;, concealed, t. «., hiding in
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Keywords: ., bookce, bookdecade1870, booksubjectfishes, booksubjectichthyology
