. Synopsis of the fishes of North America [microform]. Fishes; Poissons. 28. AMIID^. 9a and very liard, scarcely covered by skin. Snout sliort, rounded. Lat- eral margins of upper jaw formed by the maxillaries, which are divided by a longitudinal suture. Jaws nearly even in front. Cleft of the mouth nearly horizontal, extending beyond the small eye. Lower jaw broad, U-shaped, the rami well separated. Between them a broad bonj' plate, with radiating striae, its posterior edge free. Jaws each with an outer series of conical teeth, behind which in the lower is a band of rasp-like teeth. Bands of
. Synopsis of the fishes of North America [microform]. Fishes; Poissons. 28. AMIID^. 9a and very liard, scarcely covered by skin. Snout sliort, rounded. Lat- eral margins of upper jaw formed by the maxillaries, which are divided by a longitudinal suture. Jaws nearly even in front. Cleft of the mouth nearly horizontal, extending beyond the small eye. Lower jaw broad, U-shaped, the rami well separated. Between them a broad bonj' plate, with radiating striae, its posterior edge free. Jaws each with an outer series of conical teeth, behind which in the lower is a band of rasp-like teeth. Bands of small teeth on the vomer and pterygoids. Palatin(»s with a series of larger, pointed teeth. Premaxillaries not pro- tractile. Tongue thick, scarcely free at tip. Nostrils well separated, the anterior with a short barbel. Suborbital very narrow. A bony plate covering the cheek, similar to the plates on the top of the head. Oper- culum with a broad dermal border. Branchiostegals 10-12. No i)seu- dobranchiae nor opercular gill. No spiracle. Gills 4, a slit behind the fourth. Gill membranes not connected, free from the isthmus. Two peculiar, long, lanceolate, obliquely striate appendages on each side of the isthmus, projecting backward and covered by the branchioste- gal rays, the anterior wholly adnate to the isthmus, the posterior free behind.* Isthmus scaleless. Gill-rakers stoutish, very short. Scales of moderate size, rather firm, cj'cloid, with a membranaceous border. Lateral line present. Dorsal fin long and low, nearly uniform; the posterior rays not much higher than the others; its insertion in front of the middle line of the body, opposite the end of the pectoral. Tail somewhat heterocercal (more so in the young), convex behind. No fulcra. Anal fm short and low. Pectoral and ventral fins short and rounded, the ventrals nearer anal than pectorals. Vertebroe amphicce- lian, as usual among fishes. Abdominal and caudal parts of the ver- tebral column subequal. Air-bladder ce
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectfishes, bookyear1882
