57 



A singular fish, not very gommon, yet found as far as Pitts- 

 burgh. It has received the vulgar names of Sailor fish, Flying 

 fish, and Skimbackj because, when it swims, its large dorsal fin. 

 appears like a sail, and it often jumps or flies over the water 

 for a short distance. Length commonly from twelve to sixteen 

 inches, of which the tail, which is very large, includes one 

 lourth, and has 24 rays. Back slightly olivaceous, scales very 

 large. Fins olivaceous brown, except the abdominal and pec- 

 toral, which arc white. The dorsal beginning before the ab- 

 dominal and reaching the end of the anal, the second and third 

 rays are one third of the whole body, the first is short and cleav- 

 ing to the second; month small, quite terminal at the lower end 

 of the rounded snout; head small, convex above. Pectoral fins 

 with 16 rays. Not very good to cat. Seen only in summer. 



59th Species. Mud Suckeu. Ctttcvtomua xanthofius. Ca- 

 tostomc xanthope. 



Diameter one fourth of the length: lateral line straight: sil- 

 verv, back olivaceous, head brown above, snout gibbose round- 

 ed: dorsal fin hardly falcate with 14 rays, anal lanceolate with 

 8 rays: lower fins yellowish. 



Found below the falls. Length from six to ten inches. It 

 lives in muddy banks, and conceals itself in the mud. Flesh ve- 

 ry soft. Head large, flattened above, mouth large, eyes ls»rge. 

 Iris silvery. Lateral line hardly raised at the base. Dorsal fin 

 above the abdominal, fins olivaceous as well as the tail, which 

 has 20 rays. Pectorals with 18 rays. Scales large. 

 4th Subgenus. Tf.ketulus. 



Body elongate cylindrical or somewhat quadrangular, nine 

 abdominal rays, dorsal fins commonly small, tail equally forked. 



An extensive Subgenus to which belong all the following 

 species of Lesueur: C. aureoltts, C. maeroh-fiidotus, C. longi' 

 'oatrum, C. nigricans, C. -uittatus, C. maculosus, C. Sucelta, 

 besides the C. teres and C. oblongus of Mitchell. 



60th Species. Black-face Sucker. Cotostomus melanojis. 

 Catostome melanopse. 



Diameter one seventh of the length: head squared, blackish 

 above, snout convex obtuse; back olivaceous, sides whitish 

 with scattered black dots, a black spot on the gill cover, and a 



