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FAMILY GADIDAE. 
Genus Lota , Guv. 
46. L. lacustris, (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 , Brer. 
49. P. nebulosus , ( Ag .) Jord. Many-spined Stickleback. Lake 
Michigan. (Jordan.) 
FAMILY ATHERINIDAE. 
Genus Labidesthes , Cope. 
50. L sicculus , 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. notatus , (Pa/.) Jord. (=i/. olivaceus , Stor.) 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 Illinois river at Pekin : 
Adult about 1 £ inches long. Head in length 3f ; dorsal 7. Depth 
in length 4i; 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. Caudal peduncle broad, width l 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 
