Cope.] ^oU [ Dec- 21, 



the superior border situated interiorly to, the line continuing the inner bor- 

 der upwards. The tooth line is elevated at the upper extremity. The basal 

 teeth are more robust than the others, and do not present grinding faces. 

 The nutritive foramina are more numerous and smaller than in the A. 

 bremarcus. 



Measurements. M. 



Vertical extent of right pharyngeal 023 



Width at second tooth 009 



at first " 004 



Length of tooth line 012 



of third tooth 006 



" of basal limb to first tooth 011 



Found with the last species by Chas. H. Sternberg, in the Pliocene de- 

 posit of Oregon. 



Alburnops angtjstarctjs sp. nov. 



Represented by the pharyngeal bones of both sides, of a species of about 

 the size of the one last described. The characteristic marks of these are 

 seen in the long extremities, both inferior and superior, and in the very 

 slight convexity of the ala, which is less prominent than in any of the Cy- 

 prinidm here described. The superior end of the tooth basis is elevated 

 and prominent. In one of the jaws all the teeth display a masticating sur- 

 face. In the other the second tooth, the only one preserved, is partially 

 worn. 



The length of the proximal limb distinguishes this pharyngeal bone from 

 that of the Anehybopsis bremarcus, if the generic characters be disregarded. 

 From all the other species the slight prominence of the ala separates it. 



Measurements. M. 



Vertical extent of right pharyngeal 023 



Length of proximal limb 010 



of tooth line .010 



of distal limb , 012 



Width at first tooth 005 



" of second tooth 007 



Length of third tooth 005 



Found by Mr. Sternberg, with the last species. 



Alburnops gibbarcus sp. nov. 



One left and two right pharyngeal bones furnish the characters of this 

 species. Their form is angulate, as in the Anehybopsis altarcus, but shorter 

 in the vertical direction. The proximal limb is rather short, and the dis- 

 tal one not as long as in the species last described. The ala widens ab- 

 ruptly at the inferior margin, and the thin superior edge of the superior 

 limb is obtusely angulate. The nutritive foramina are rather numerous. 

 The first and second teeth display little or no grinding surface. 



