88 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



being about oue and a fourth pounds, while A. Hoyi I'eaches a maximum 

 of less than one-half pound. 



The height of the body is equal to the length of the head. The dis- 

 tance from the snout to the nape is much more than the length of man- 

 dible, (2.28 inches to 1.52 inches.) The width of the interorbital area is 

 equal to the length of the snout. The length of the snout is less than 

 the length of the operculum. The length of the maxillary is less than 

 the greatest width of the head. 



Body comi)ressed,- deeper in i^roportion to length than other species 

 of the genus. The bones of the head are stronger and more prominent 

 than in other species; mucous tubes on preoperculum, on frontals, and 

 parietala large and prominent. 



Teeth very minute, yet present on premaxillaries and tongue. 



The height is .22 of length; the least height of tail is .07f ; the length 

 of the caudal peduncle is .13-^ ; the distance from the snout to the dorsal 

 fin is .47^; the distance from the snout to the anal fin is .78^^; the length 

 of the head is .22|; the distance from snout to the nape is .1G|. The 

 width of the head is .343 of the length of the head; the width of the 

 interorbital area is .22;^ ; the length of the snout is .22i; the length of 

 the maxillary is .32; the length of the mandible is .48J; the diameter of 

 the orbit is .25^. 



Br., 9; D., 3-10; A., 2-10; C, 10-18-9; R, 10; V., 12; number of 

 scales in the lateral line, 80; number of rows of scales above lateral line 

 8; below lateral line, 11. Length, 16.5 inches. 



National Museum, 'So. 12455. Locality, Grand Haven, Mich., Lake 

 Michigan. 



3. — CoEEGONUS CorESii, sp. nov. 



A specimen of a white-fish was taken in Chief Mountaiii Lake, at the 

 eastern edge of the llocky Mountains, by Dr. Elliott Coues, U. S. A., 

 surgeon and naturalist of the northern-boundary commission. 



This specimen is very different in its type of form from any species 

 hitherto described from this continent. In Giinther's arrangement of 

 the species of Coregonus, it would be placed in group (a), with the upper 

 jaw j)roduced into a cutaneous appendage. In this particular, it resem- 

 bles Coregonus oxyrhynchns Lin. and C. Lloydii Giintli. Unlike these 

 species, it is an elongate fish, the proportion of height to length being 

 much the same as in G. ^V illiamso7ii Gir. and C. quadrilateralis Eich. ; it 

 also resembles this type of form in the narrow supplementary bone of 

 the maxillary, and the former species in the shape of the maxillary. 



The only previous reference to a fish supposed to be of this genus 

 from the Saskatchewan Eiver is in some remarks appended to the 

 description of C. lahradoricus in the Histoire Naturelle des Foissons. Ya- 

 lenciennes refers, in the most undecided manner possible, to a fish which 

 he believes to be a salraonoid, and makes his diagnosis from a drawing. 

 There is, in fact, no direct evidence in what he says to prove that the 

 specimen was in his possession. He admits that he is "not able to 



