LAMPREYS AND FISHES OF INDIANA. 181 



du Mus. V, 152); large streams of Carroll County (33, '88, 44); Ohio 

 County (23, '88, 56); Brookville, Franklin County (5, No. 2, 4); White 

 River, at Indianapolis (i, '77, 377); Lower Wabash (i, '77, 45); Law- 

 rence County (23, '84, 200); Yincennes, Patoka, Posey County, Evaus- 

 ville, and White River at Spencer (4, '88, 162-166). Milner (11, '77, 

 3, 36) says that it is found in the Great Lakes. Vigo County (16, 94). 

 The habits of this species are in many respects different from those of 

 the members of the genus Avieiurus. The latter are lovers of sluggish 

 and muddy streams, in the silt and dirt of which they seek their living. 

 The Channel Cat, on the contrary, delights in clear, flowing rivers and 

 brooks, and the vicinity of water falls. They are apparently more active 

 fishes. According to Prof. Forbes, who has studied the food of fishes 

 with diligence and success, this species eats both animal and vegetable 

 matters. One fourth of the food was of vegetable origin, chiefly alga>. 

 An important element consisted of moUusks, both univalve and bivalve. 

 These had usually, by some unknown means, been torn from their shells 

 before being eaten (14-, '88, 457). One fish was found to have eaten 

 one hundred and twenty mollu^ks. A considerable part of the food con- 

 sists of insects and their larva?. Leeches and crustaceans are also eaten. 

 A dead rat was found in the alimentary canal of one individual. Other 

 fishes are a'so eaten by the channel cat. 



Order 6. EVENTOGNATHI. 



Body possessing the normal fish like form. The skin is, except in rare 

 cases, clothed with cycloid scales. Maxillary bone normal. Opercular 

 bones all present. Mouth toothless. Lower pharyngeal bones falciform 

 and furnished with teeth in fnjm one to three rows The four anterior 

 vertebree coalesced and connected with the organs of hearing. No adi- 

 pose fin. 



Includes our suckers, carp, and toothless minnows. 



From all other so ft- rayed fishes the members of this order may be dis- 

 tinguished by the character of the lower pharyngeal bones and their teeth. 

 These bones are relatively strong, usually curv'ed into the form of a hand- 

 sickle, and are provided with strong teeth, which are sometimes arranged 

 in three, more commonly in one or two rows. These bones may be ex- 

 tracted for examination of the teeth by raising the gill-cover and thrust- 

 ing in some hooked instrument, or even the head of a pin, just in front 

 of the clavicle, the bone which bounds the gill-slit behind. The adher- 

 ing flesh may then be removed. Care must be taken not to injure the 

 teeth. 



From the toothless herrings (Cliipea) and the gizzard shad (Dorosoma) 

 and the white-fishes (Coregonus) the Eventognathi may be distinguished 

 by the fact that the maxillary bone is composed of a single slender bone. 



