FISHES OP LAKE SUPERIOR. 303 



that author gives of it. The more distant position of the anus ; the 

 proportions in the dimensions of the head and body ; the lateral 

 line which terminates before the extremity of the tail ; the more 

 anterior position of the anal relatively to the second dorsal, and 

 finally the shorter pectorals in proportion to the length of the 

 head, are the most striking peculiarities. 



I have found several specimens of this species in Montreal 

 River. Among the number was one, whose general form has the 

 same aspect, the same tint, the same proportions of the head and 

 body, the same form and structure of the fins, the same mouth, but 

 whose palatine bones bear a small group of teeth like those of the 

 vomer. As yet we know only one freshwater species with palatine 

 teeth, the C. asper Rich. From among five other specimens, also 

 from Lake Superior, from Isle Royale, for which I am under obligation 

 to Dr. C. T. Jackson, I have found the same group of palatine teeth 

 in the largest of them, so that I am inclined to consider this peculiar- 

 ity as an indication of old age, rather than a specific character. 



CoTTUS Franklini, Agass. 



This species is distinguished from the preceding by the follomng 

 characters : the head retains the same proportions relatively to the 

 body, but the mouth is smaller and less opened, and the teeth are less 

 strong. The body diminishes more abruptly in height beyond the 

 anus, and in its whole length the thickness is proportionally greater. 

 Thence there results a more cylindrical and subcorneal form. The 

 lateral line is less approximated to the back ; it disappears on the 

 sides as in the preceding species, but the row of pores continues as 

 far as above the middle of the insertion of the caudal after a very 

 abrupt depression a Uttle before its termination. 



The fins are less developed, but their relative position is the same. 

 The ventrals instead of five rays have only four. The caudal rays 

 alone bifurcate once on the middle of their length. In all other 

 fins they are undivided. They may be reduced to a formula as 

 follows : 



Br. 6 ; D. 8-17 ; A. 12 ; C. 1-12.2 ; V. 1-3 ; P. 14. 



The membranous appendage of the posterior margin of the anus is 



