316 



BULLETIN OF THE BUREAU OF FISHERIES 



All the above are compressed laterally, but the degree of compression is least in 

 typical artedi and typical reighardi. 



Coregonus. — The body of clupeaformis is most like that of johannse in outline. 



Prosopium. — The body of quadrilaterale is an elongated ellipse in outline, as in 

 the first group of Leucichihys, but the body is nearly terete. 



Length 



The coregonid forms in the Great Lakes have about the same average and maxi- 

 mum lengths. The range in size of specimens seen by me is shown by the dimensions 

 below. From this it appears that the maximum lengths of Coregonus clupeaformis 

 and of the smallest species of Leucichthys (hoyi and Iciyi) only are very different from 

 those of the rest and would be of value in discriminating certain specimens of these 

 species. It appears, further, that the maximum lengths known for each species from 

 the various lakes also are very similar. 



Fig. 10. — Body outline of the type of whitefish common in the upper lakes 



Species 



Leucichthys johannse 



Do 



L. alpenee. 



Do.. _. 



L. zenithicus 



Do.. _. 



Do 



Do 



L. reighardi.- 



Do 



Do.... 



Do _ 



L. nigripinnis 



Do.. 



Do 



Do 



Do.... 



L. kiyi... 



Do.... 



Do 



Do 



Lake 



Michigan 

 Huron... 

 Michigan 



Huron 



Superior. 

 Nipigon.. 

 Michigan 

 Huron... 

 Michigan 

 Superior. 

 Nipigon.. 

 Ontario. . 

 Michigan 



Huron 



Superior. 

 Nipigon.. 

 Ontario. . 

 Michigan 

 Huron... 

 Superior. 

 Ontario.. 



Range in length, 

 in millimeters 



181-288 

 132-332 



130- 386 



131- 368 

 134-332 

 153-308 

 152-312 

 139-318 



144- 278 

 203-320 



145- 304 

 203-295 

 220-360 

 208-371 

 198-375 

 141-355 



297 

 122-245 

 105-249 



132- 204 

 148-263 



Species 



L. hoyi 



Do 



Do 



Do . 



Do 



L. artedi 



Do 



Do 



Do.. 



Do 



Do 



L. nipigon 



Coregonus clupeaformis— 



Do.. 



Do 



Do 



Do 



Do _. 



Prosopium quadrilaterale 



Do 



Do 



Do.. 



Do ... 



Lake 



Range in length, 

 in millimeters 



Michigan ... 



82-265 



Huron 



79-221 



Superior 



107-251 



Nipigon 



106-231 



Ontario 



128-277 



Erie 



128-102 



Michigan ... 



127-367 



Huron 



125-371 



Superior 



135-135 



Nipigon 



138-253 



Ontario 



155-366 



Nipigon 



220-447 



Michigan 



179 mm. to 6 lbs. 



Huron 



192 mm. to 15 lbs. 



Superior 



1«0 mm. to 6 lbs. 



Nipigon 



203 mm. to 4 lbs. 



Erie 



291 mm. to 5 lbs. 



Ontario 



253 mm. to 6 lbs. 



Michigan 



156-119 



Huron 



176-393 



Superior 



6.5-380 



Nipigon 



191-318 



Ontario 



213-361 



Depth and Width 



Depth and width measurements of the body can not be recorded satisfactorily 

 for specimens of coregonids, because those coming from the deeper waters are always 



