i8 University of Michigan 



Abrauiis crysolencas (Alitchill) 



Plargyrus americanus Cope, Proc. Acad. Nat. Sci. Phila., 1864, p. 

 281. Saginaw Bay and Grosse Isle, Detroit River. 



Seven examples from Grosse Isle, Michigan, and Lake 

 Michigan. Mr. Morgan Hebard also obtained it at Pequam- 

 ing in Lake Superior, Baraga County. 



Ceratichthys vigilax Baird and Girard 



PLATE 7 



Hybopsis tuditans Cope, Trans. Amer. Philos. Soc. Phila., (2) XIII, 

 i865, p. 381. Detroit River, Miehigmi. 



Head 4; depth 4 1/2 ; D. iii, 7, 1 ; A. iii, 6, i ; P. i, 15 ; V. i, 

 7 ; scales 42 in lateral line to caudal base and 2 more on lat- 

 ter; 7 scales above 1. 1. to dorsal origin, 4 below to ventral 

 origin, and 5 below to anal ; 23 predorsal scales ; head width 



1 7/8 its length; head depth i 1/2; snout 3 1/8; eye 3 1/2; 

 maxillary 3 3/4; mandible 3 i/io; interorbital 2 4/5; first 

 branched dorsal ray i 2/3 ; anal ray 2 ; least depth of caudal 

 peduncle 2 1/4; upper caudal lobe i i/io; pectoral i 1/2; 

 ventral i 3/5. 



Body oblong, rather Avell compressed though with heavy or 

 somewhat stout appearance, deepest at dorsal origin, edges 

 all more or less convexly rounded, and profiles alike. Caudal 

 peduncle stout, rather well compressed and least depth about 



2 2/5 its length. 



Head moderate, broad, robust, obtuse, width about 4/5 its 

 least depth, sides flattened to slightly converging below where 

 also flattened convexly. Head broadly convex above and 

 profiles alike, though lower slightly more convex. Snout ob- 

 tuse, convex, length 2;'3 its width. Eye elongate, ellipsoid, 

 large, high, placed at first 2/5 in head. Mouth small, inferior, 

 terminal, upper jaw very sligthly protruding. Maxillary con- 



