. 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 ERIMTZON. 143 posterior field are also much broader and farther apart tban those of the lateral and anterior fields. The scales are smaller upon the anterior portion of the body than upon the sides. Another remarkable peculiarity of this genus consists in the great difference there is among the adulta in the form of their fins in the several sexes. The young also difier s
. 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 ERIMTZON. 143 posterior field are also much broader and farther apart tban those of the lateral and anterior fields. The scales are smaller upon the anterior portion of the body than upon the sides. Another remarkable peculiarity of this genus consists in the great difference there is among the adulta in the form of their fins in the several sexes. The young also difier strikingly from the adults both in form and coloration The body of Moxostoma is elongated and somewhat compressed, though stouter tban that of Ptychostomua and Catoatomua proper. The greatest depth is over the veulrals. "The head is small; the small mouth opens obliquely forwards and downwards; wbeu open the lower jaw is quite prominent. The lips are small and transversely lidged; the lower one is slightly bilobed. The dorsal is over the ventrala; its length considerably exceeds its height in the males ; in the females its dimensions are more nearly equal. The pectorals and veutrals are more pointed and longer in the males than in the females. The lower margin of the anal fin is'bilobed in the males, while in the females it is simply emarginatcd ; in both sexes, the anal when bent backwards reaches the caudal. "The pharyngeal bones have a greater resemblance to those of the genus Ichthyobm tban to any other of the tribe of Catostomi; the symphysis however is shorter, and tbeteuth are neither so minute nor so numerous; they increase also more rapidly in size from above downwards, and are more strongly curved inwards, the innermost edge rising into an acute point, which is more prominent in the middle and upper teeth, than in the lower ;â(Agassiz, Am. Journ. Set. Arts, 1855, p. 200.) Moxostoma Girard, 1856.â" May be circumscribed by characters more natur
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