230 REPORT OF STATE GEOLOGIST. 



COREGONUS HOY! (Gill). 



Moon-eye.; Cisco. 



Jordan and Gilbert, 1882, 8, 299; Jordan, 1884, 12, 541, pi. 197. 



Form elongate and considerably compressed. Depth, in the length, 

 four and one-half. Head rather long, four times in length. Snout long, 

 three and one-third in the length of the head. Eye large, three and one- 

 half to four in head. Mouth large; maxillary long, reachiug to pupil. 

 Preorbital long, its width equal to that of pupil. Premaxillaries wider 

 than high. Lower jaw projecting little or none beyond the upper. Gill- 

 rakers long and slender, as long as the eye. Dorsal rays, ten ; anal rays, 

 ten. Scales 8-80-8. Color bluish-gray above, silvery on the sides, 

 white below. New York, westward to Lake Michigan, in deep water 

 (i^No. 2). _ , 



Not much is known concerning the habits of the species here described. 

 It appears to frequent only deep waters, being considered by Prof. Milner 

 to range from thirty to seventy fathoms, where it has been taken in con- 

 siderable quantities. Milner also states that it furnishes the principal 

 food of the Mackinaw Trout. It reaches a length of ten inches. 



CoREGONus ARTEDi LeSueur. 



Lake Herring; Cisco. 



Jordan and Gilbert, 1882, 8, 301 ; Jordan, 1884, 12, 541, pi. 197. 



Form rather long, compressed, and tapering toward the snout and 

 tail. Head small, four and one-half in the length ; snout pointed ; 

 upper surface of the head rather flat. Mouth large, the maxillary reach- 

 ing back to the pupil. Premaxillaries short and narrow, placed almost 

 horizontally. No teeth present. Jaws about equal in the closed mouth, 

 the lower projecting in the open mouth. Preorbital and supraorbital 

 narrow. Suborbital and postorbilals broad. Eye small, four to five in 

 length of head. Dorsal rays, ten ; anal, twelve. Scales, 8-75 to 90-8. 

 Color dusky above, with reflections of blue; scales of sides and belly sil- 

 very, with minute specks of dusky ; fins pale, with edgings of dark. 

 Length about nineteen inches; average specimens less than one foot. 

 Distributed from the lakes of Northern Indiana northward ; abundant. 

 In Indiana it has been reported from the Tippecanoe River and its 

 tributary lakes (1, '77, 45) ; lakes of Eel River system (4, '94, 37). 



Professor Milner, who describes the fish under the name of Argyroso- 

 mus clupeiformis (11, '72-73, 65), gives us sonie facts regarding the 

 habits of this important fish. It lives in the shoaler waters, from shore 

 to a depth of twenty fathoms, sometimes going in immense schools. 

 They often ci'owd into the pound-nets in masses, and do not appear to 



