. 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 ERIMYZON. 141 and oblique in positiou when the month is closed, the mouth thus similar to that of Ichihyohua. Eye moderate, rather high up, placed about mid- way of the head: suborbital bones considerably developed, not very ranch narrower than the fleshy portion of the cheek below tbem, the posterior suborbital concavo-convex, about twice as long as deep, some- times div
. 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 ERIMYZON. 141 and oblique in positiou when the month is closed, the mouth thus similar to that of Ichihyohua. Eye moderate, rather high up, placed about mid- way of the head: suborbital bones considerably developed, not very ranch narrower than the fleshy portion of the cheek below tbem, the posterior suborbital concavo-convex, about twice as long as deep, some- times divided, the anterior somewhat deeper than long, sometimes divided into two, sometimes united with the preorbital bone, which is well developed and much longer than broad. Opercular bones moder- ately developed, scarcely or not rugose. Fontanelle evident, rather large. Gill-rakers rather long, about half the diameter of the eye in length. Isthmus moderately developed, about the width of the eye. Pharyngeal bones weak, the teeth quite small, slender, and weak, rapidly diminishing in length upwards, each tooth narrowly compressed, with a cusp on the inner margin of the cutting surface, and some ine- qualities besides. Body oblong, rather shortened, heavy forwards and considerably com- pressed. Scales rather large, more or less crowded forwards, sometimes showing irregularities of arrangement, the longitudinal radiating furrows much stronger than usual, the scales rather longer than deep, b so imbri- cated in the adult that the exposed surfaces appear deeper than long. Lateral line entirely wanting. Scales in the longitudinal series from bead to base of caudal 35 to 45 in number; scales in transverse row from base of ventral to dorsal 12 to 18. Dorsal fin rather short and high, with from 10 to 14 developed rays, tbe number usually 11 or 12. * Beginning of dorsal fin rather nearer snout than base of caudal. Pec- toral fins moderate, not reaching ventrals ; the latter not to vent. Veut
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Keywords: ., bookce, bookdecade1870, booksubjectfishes, booksubjectichthyology
