lo University of Michigan 



Dorsal origin nearer snout tip than caudal base, fifth snn- 

 ple ray longest, prolonged back far as tips of median caudal 

 rays. Simple dorsal rays not especially osseous. Anal inserted 

 little nearer ventral base than caudal base, fourth simple and 

 first branched rays subequally longest, and fin depresses back 

 slightly beyond caudal base. Caudal well forked, upper lobe 

 longer or 2 1/3 in head and trunk, both lobes sharply pointed. 

 Pectoral broad, slightly over half way to ventral. Ventral 

 origin about opposite second branched dorsal ray base, fin 

 reaches vent close before anal. 



Color in alcohol dull or uniform brassy-brown. Iris brown- 

 ish. 



Length 293 mm. 



No. 6,647, A. N. S. P., cotype (type) of Carp'wdcs sclcnc 

 Cope. Probably Root River, Michigan. E. D. Cope. 



Another cotype. No. 6.648, A. N. S. P., same data, shows: 

 head 4; depth 2 2/7; D. v, 25, i ; A. iv, 7, i ; scales 33 in lateral 

 line to caudal base and 4 more on latter; 8 scales above 1. 1., 6 

 below to anal origin ; 16 predorsal scales ; snout 4 1/5 iu head ; 

 eye 3 5/6: mouth width 4; interorbital 2 1/3; length 236 mm. 



Catostojuiis nigricans Le Sueur 



Hyloiny::oii nigricans Cope, Proc. Acad. Nat. Sci. Phila., 1864. p. 

 285. Grosse Isle. 



Moxostoma aiircolum (Le Sueur) 



Ptychostomus aur coins Cope, 1. c, p. 285. Saginaw Bay and Grosse 

 Isle. " 



Ptychostomus aurcoliis Cope, Proc. Amer. Philos. Soc. Philn., XI, 

 1870, p. 476. Saginaw Bay. 



Moxostoma aiircolum Fowler, Proc. Acad. Nat. Sci. Phila., 1913; 

 p. 59 (Saginaw Bay example). 



One from Saginaw Bay in the Cope collection. 



