(42) 



FAMILY GADIDAE, 



Genus Lota, Cuv. 



46. L. locusiris, (Mitch.') Gill. Eel-pout. Very abundant in Lake Mich- 

 igan ; rare in the Ohio (Jordan), and in the Illinois (Forbes). 



FAMILY GASTEROSTEIDAE. 



Genus Eucalia, Jord. 



47. E. inconstans, (Kirt.) Jordan. Stickleback. Has been found rather 

 common in small tributaries to Lake Michigan, and in Rock river, by 

 Prof. Jordan. 



48. E. pygmaea, (Ag.) Jord. Occurs in Lake Michigan. (Jordan.) 



Genus Pygosteus.. Brev. 



49. P. nehulosus, (Ag.) Jord. Many-spined Stickleback. Lake 

 Michigan. (Jordan.) 



FAMILY ATHERINIDAE. 

 Genus Labidestkes, Cope. 



50. L siccidus. Cope. Silverside. This beautiful little species exists 

 in the greatest abundance in the rivers and small streams tributary to the 

 Illinois, in the western and central parts of the state. As far as 1 have 

 learned, it does not occur in Lake Michigan or its tributaries. Neither 

 does it occur in Rock river. Its centre of abundance seems to be the 

 streams in the more strictly prairie region of the state. 



FAMILY CYPRINODONTIDAE. 



Genus Fundulus, Lac. 



51. F. diaphanus, {LeS.) Ag. Barred Minnow. Very abundant 

 about the sandy mouths of tributaries to Lake Michigan, keeping in 

 "schools" in the shallow water near the edge. Occurs in smaller numbers 

 throughout the state, specimens having been taken in nearly all the large 

 streams. 



Genus Zygonectes, Ag. 



52. Z. notat us, (Rof.) Jord. (z=Z. olivacens. Star.) Top Minnow. Com- 

 mon in the Illinois and smaller tributaries, and in most streams through the 

 state, except in the tributaries of Lake Michigan. 



53. Z. dispar, Ag. Striped Minnow. A number of specimens are in 

 the state collection from the Illinois river at Pekin, and others from several 

 small tributaries. The following is the description of an average specimen 

 from the lllmois river at Pekin : 



Adult about 1 .] inches long. Head in length .3? : dorsal 7. Depth 

 in length 4^ ; anal 9. Lateral line 32 to .34 ; longitudinal rows 9. Eye 

 longer than snout, 3 in head. Dorsal commencing slightly behind anal ; 

 back flattened and plane with the top of the head, sloping from the dorsal 

 to the end of the snout, ("audal peduncle broad, width j head. Colors (in 

 alcohol) above and on sides olive : vertebral line and top of head darker ; 

 also a crescentic patch of dark brownish extending downward and obliquely 

 backward from the lower posterior part of orbit. Entire head scaly, scales 



