8 University of Michigan 



Catostomid.'^ 



Carpiodes thompsoni Agassiz 



Carpiodes thompsoni Cope, 1. c, p. 285. Saginaw Bay. 



Capiodcs thompsoni Fowler, 1. c., 1913, p. 46 (above material;. 



Carpiodes thompsonii Cope, Proc. Amer. Philos. Soc, XT, 1870, p 

 4S3 (above material). 



One Saginaw Bay example in the collection. 



Carpiodes selcnc Cope 



PLATE 2 



Carpiodes selcne Cope, 1. c., pp. 479-481. Probably Root River, 

 Michigan. 



Carpiodes selene Fowler, 1. c, p. 47 (types?). 



Head 4 ; depth 2 1/3 ; D. v, 21, i ; A. iv, 7 ; P. i, 14 ; V. i, 8 ; 

 scales 33 in lateral line to caudal base and 4 more on latter ; 8 

 scales above 1. 1., and 5 below to ventral origin (6 to anal ori- 

 gin) ; 15 predorsal scales; head width i 3/4 its length; head 

 depth at occiput i 1/8; snout 3 1/3 ; eye 4; mouth width 4 2/5 ; 

 snout tip to hind maxillary end 3 3/4 ; interorbital 2 1/6 ; fourth 

 simple dorsal ray i 2/3 ; fourth simple anal ray i 1/6 ; pectoral 

 I 2/7; ventral i i/io; least depth of caudal peduncle i 2/3. 



Body deep, compressed, back elevated, so that predorsal 

 well convex but after dorsal origin sloping gradually down. 

 Predorsal edge constricted, not sharply trenchant, and other 

 edges all rounded convexly. Lower profile but slightly con- 

 vex, much less so than upper. Greatest depth at dorsal origin. 

 Caudal peduncle well compressed, length about 3/4 its least 

 depth. 



Head moderately small, broad, sides slightly convex, but 

 very slightly convergent below, and upper profile much more 

 inclined than lower. Snout very obtuse, with slight anterior 



