no. 1752. NOTE ON THE GOLD-EYE JORD I \ \\1> TIW \irs<>\ . 



355 



gold-eye in mind, as Amphiodon alosoides, and also in his Hyodon 

 heterurus. If this view be not accepted, these two nominal -pedes 

 will be placed in the synonymy of the moon-eve. Hiodon tergisus. 

 The name chrysopsis must then stand for the gold-eye and the 

 species will be FJattonist'nts chrysopsis. 



We regard the gold-eve as certainly generically distinct from the 

 moon-eye, adopting for the former Rafinesque's name Amphiodon. 

 Gill and Jordan have defined BJlattonistius as a subgenus by the 

 carination of the entire abdomen and by the shortness of the dorsal 

 fin. Equally important is the distinction perhaps indicated by 

 Rafinesque of the backward insertion of the dorsal, which in the 

 gold-eye is considerably behind the front of the long anal, about 

 over the ninth ray. In the moon-eye the anal i> shorter and the 

 dorsal is inserted in front of it, its middle directly over the vent. 



Description of the gold-eye. — Two specimens from the Red River 

 of the North at Winnipeg, Manitoba, 235 and 265 mm. in length: 



Fig. 1.— Amphiodon alosoides. 



one from Warroad, Lake of the Woods, 310 mm.; one from Gosport, 

 Indiana, 172 mm., and two from South Loup River, Nebraska, !>7 

 and 126 mm. long. 



Head 4 to 31} in body length to base of caudal, smallest in adults; 

 depth 34 to 3$ in body length; eye .'!!; to .'!! in head, larger in young; 

 snout 5; interorbital space equal to eye diameter; maxillary measured 

 from tip of snout, two in head; I). 9 or 10 (fully developed rays); A.29 

 to 35; scales 6-58 to 60-12 (is in transverse series from insertion of 

 dorsal to insertion of anal): 8 between ventrals and lateral line: B. '.». 



Body greatly compressed, its width :>\ in depth, greatest width 

 above lateral line, thinning to ventral out line, which is strongly car- 

 inated from isthmus to anal fin; depth intermediate between that of 

 Hiodon tergisus and //. selenops; ventral and dorsal outlines parallel 

 and straight in center of body for nearly half length; axis of body 

 between snout and caudal peduncle high, leaving three-fifths of depth 

 below; dorsal outline hence tapering less to head and tail than ven- 



a Journal do Physique, L819, i>. ^21=Elattonistius ) <iill and Jordan, Hull. 10, I S. 

 Nat. Mus., 1877, p. 68. 



