254» ON THREE NEW SPECIES 



2. S. *grisea. Second dorsal long, low anteri- 

 orly, elevated and rounded posteriorly; scales rough: 

 a slight frontal depression. 



Inhabits the Ohio. 



Body eliptic, attenuated at the two extremities, 

 elevated on the neck and on the back ; head small, 

 pointed ; snout a little prominent, round ; opening 

 of the mouth small ; fates unequal, the inferior one 

 smaller, closing within the superior; many pores be- 

 neath the inferior one and at the tip : maxillaries 

 and intermaxillaries in these two species covered by 

 the inferior corner of the nostrils ; teeth very small 

 and short in the jaw, very strong, round and obtuse 

 at the opening of the throat, and placed upon a trian- 

 gular bone, furnished with two large and inferior 

 apophyses, for the attachment of the muscles; to these 

 teeth there are others which correspond with them, 

 and are grouped upon two separate bones placed su- 

 periorly and at the opening of the throat ; eye round, 

 large, near the summit of the head ; iris black above 

 and silvery below ; no spine upon the operculum, the 

 denticulations of the preoperculum and interopercu- 

 lum are hardly sensible ypectoral fins falciform, placed 

 a little before the thoracic fins; thoracic fins armed 

 with a strong bony ray ; aval small, pointed, sub- 

 triangular, having two strong bouy rays anteriorly, 

 of which the first is very short : this fin is smaller 

 than that of the oscula, and more distant from the 

 end of the tail ; caudal subtruncated ; scales broader 

 than long, border rounded, denticulated; larger upon 

 the sides, the abdomen and the back, than upon the 



