PISHES OF LAKE SUPERIOR. 299 



broad, jaws of equal length. Opercular apparatus and cheeks 



bare. 



Etheostoma blennioides Raf. 



" no ta turn. 



" third species sent by Prof. Baird. 



PILEOMA, Dekay. 



Head conical, truncated, in form of a hog's snout ; opening of 

 the mouth moderate, and in form of an oblique arc of a circle, opening 

 at the end of the snout, very slightly protractile. Lower jaw a lit- 

 tle shorter. Operculum and cheeks scaly. 



Etheostoma Caprodes Rafin. 

 Pileoma semifasciatum Dekay. 



" zebra Agass. Lake Superior. 



PCECILOSOMA, Agass. 



Head short and strong, rounded. Mouth little opened, propor- 

 tionally broad ; it is not protractile, though the maxillary bone be 

 moveable. Opercular apparatus scaly ; cheeks bare. 

 Etheostoma variaturn Kirtl. 

 " maculatum Kirtl. 

 " third species sent by Prof. Baird. 

 " fourth species sent by Prof. Baird. 



BOLEOSOMA, Dekay. 



Head very short, rounded in section of a circle ; mouth small, 

 horizontal, slightly protractile. Opercular apparatus and cheeks 

 very scaly, neck and sides of the head compressed. 



Boleosoma tessellatum Dekay. 



" tenue Agass. Charleston, S. C. 



" maculatum Agass. Lake Superior. 

 Etheostoma Olmstedi Storer. 



fifth species sent by Prof. Baird. 



