600 PALEONTOLOGY OF NEW YORK. 



The specimen described has a length of 57 mm. and a height of 22 mm. 



This species is distinguished from G. lingualis in its more elongate form, nar- 

 rower anterior end and by the convexity of the umbonal slope continuing to 

 the post-inferior extremity. 



Formation and locality. In a micaceous red sandstone of the Chemung group, 

 at Mansfield, Tioga county, Pa. 



Glossites subnasutcs, n. sp. 



PLATE XCVI, FIU. U. 



Shell of medium size, elongate-sub-elliptical; length more than twice the 

 height ; basal margin gently curved, nearly straight in the middle. Poste- 

 rior extremity produced and sub-nasute below, curving forward above to the 

 hinge-line. Cardinal line gently arcuate, about half the length of the shell. 

 Anterior end declining from the beak and narrowly rounded. 



Valves depressed-convex below and posteriorly, becoming convex in the 

 middle and above. 



Beaks at about the anterior sixth, directed forward, low and appressed, 

 rising but little above the hinge-line. Umbonal slope convex, continuing to 

 the post-inferior extremity, and producing a sub-nasute extension of the 

 margin. 



Surface marked by fine concentric striae, which are often fasciculate, and 

 sometimes produce regular undulations of the surface on the umbo. 



Two specimens measure respectively 44 and 38 mip. in length, and 18 and 

 16 mm. in height. 



This species is distinguished by the nasute extension of the post-inferior 

 extremity, in which character it dift'ers from any other species here described. 



Formation and locality. In a sandstone of the Chemung group, at Mansfield, 

 Tioga county, Pa. 



