(79) 



30. Little Pickerel. Esox salmoneus, Raf. (2.) A small fish and 

 two tadpoles of frogs. 



MOON EYES. HYODONTIDAE. 



31. Toothed Herring. Hyodon tergisus, Le S. (3). Numerous in- 

 sects, including a bee, carabid beetle, some aquatic hemiptera, numerous 

 larvae of Ephemeridae ; a remarkable crustacean of which but a single 

 specimen has hitherto been found in this country (Leptodora hyalina, * 

 Lillj.); some rotten wood, elm seeds and other vegetable trash, evidently 

 gathered from the drift-wood where one of the specimens had found its food. 



HERRINGS. CLUPEIDAE. {6.) 



32. Ohio Golden Shad. Pomolobus chrysochloris, Raf. (1.) A 

 small bony fish and a few fragments of insects. 



33. Gizzard Shad. Hickory Shad. Dorosoma cepedianum, Le S., 

 var. heterurum, Raf. (5.) Extremely dirty. Every stomach examined was 

 at least half full of mud. The food was chiefly vegetable, consisting largely 

 of algae and a few Crustacea, such as would naturally be entangled in the 

 vegetation eaten. The objects recognized were a few diptera larvae, Lep- 

 todora hyalina, Cypris, Cyclops, masses of Chara, confervoid algae, desmids, 

 and vast numbers of diatoms. 



MINNOWS. CYPRINIDAE. {15.) 



Time has failed for the examination of any sufficient number of this 

 family, some of the most important genera having been omitted entirely. 

 Enough has been learned, however, to show that these fishes live, some 

 chiefly on aquatic vegetation (especially algae) and others on insects, of 

 which small diptera and their larvae seem to constitute the greater part. 

 The section whose teeth are not hooked probably eat vegetable food more 

 largely than those with raptatorial teeth, no insects at all having been found 

 in the intestines of the five specimens of that section examined. — I found a 

 surprising amount of dirt in the intestines of these herbivorous minnows, — 

 too much, I think, to have been taken incidentally. 



34. Stone Roller. Campostoma anomalum, Raf. (1.) Full of dirt 

 and confervoid algae. 



35. Blunt-nosed Minnoio. Hyborhynchus notatus, Raf. (3.) Full of 

 dirt, with fragments of endogenous vegetation, confervoid algae, and many 

 diatoms. 



36. Silvery Minnoio. Hybognathus argyritis, Grd. (1.) Full of 

 sand and an immense number of diatoms, with a few filaments of confervoid 

 algae and fragments of other vegetable matter. 



'See appendix. 



