no. 1752. NOTE ON THE GOLD-EYE JORDAN I \ l> THO l//'>o\ 



357 



small, equal to dorsal height : anal longer t han in allied species, its base 

 nearly equal to body depth; falciform, its border notched (in males) 

 or concave, rays anteriorly greatly heightened, in males especially, 

 to about two-thirds head; posterior lays very short in both sexes; 

 base of anal greatly compressed and slightly concave in outline. 



Color, in spirits, lustrous silvery, bluish above, colorless below, (ins 

 with dark margins, save for ventrals, which are clear. 



Iris bright golden yellow; sides of head with golden luster. 



The sexual differences are somewhat marked, and some differences 

 are observable in dentition. These may be due to age. The speci- 

 mens from Winnipeg, Red River of the North, are of moderate size, 

 23o and 2(i5 mm. in length, to the base of the caudal, one female, 

 the other male. The parasphenoids in both have a single median 

 series of strong canines similar to the lateral series anteriorly, doub- 

 ling posteriorly; the teeth on the palatines are large and strong; the 

 concavity of the dorsal outline of the head is not very marked in 

 either, and the snout is rounded. The anal fin is strongly notched 

 in the male, but not in the female. In the specimen from Warroad, 

 Lake of the Woods, an adult male of large size, 310 mm. in length 

 to the base of the caudal, the space between the nostrils and occiput 

 is strongly convex, the head appearing to be much more strongly 

 turned upward, and the snout is almost, if not quite, truncate. The 

 teeth on the parasphenoids are less strongly developed than in either 

 male or female from Winnipeg, two rows of small teeth being present 

 anteriorly between the lateral rows, and the palatine teeth are not 

 as strong. The anal fin is strongly notched. 



The remainder of the specimens from White River, Indiana, and 

 South Loup River, Nebraska, are of smaller size and immature, but, 

 in so far as can be seen, resemble the Winnipeg specimens. The 

 differences of the Warroad specimen may be due to sex and age. 



Measurements of Amphiodon alosoides. 



