﻿NEW CRETACEOUS FOSSILS. 325 



extremity truncated ; posterior margin obtusely rounded, posterior side concentrically 

 lineated ; valves somewhat contracted obliquely from beak to base. 



An elegant species, remarkable by the slightly undulated anterior. Substance 

 of shell thin and fragile, yet one perfect valve is in Dr. Spillman's collection. 



Family SOLENWJE. 

 LEGUMEN, Conrad. 



Shell equivalve, very inequilateral, flattened ; hinge with two very slender teeth in 

 the right valve under the beak, and one posterior very oblique prominent lamelliform 

 tooth. 



This genus is perhaps most nearly related to Cultellus, Schum. It can 

 readily be distinguished by external characters ; its flat valves, straight and more 

 produced anterior side, &c. 



Legtjmen ellipticus. PI. 34, fig. 19. Oblong, compressed, very inequilateral, very 

 thin; valves flattened or contracted obliquely from beak to base, concentrically 

 lineated ; beak not prominent above the hinge line, apex acute ; ends regularly and 

 nearly equally rounded ; posterior extremity situated much more nearly on a line 

 with the hinge than the ventral margin. 



One right valve only is before me. The cardinal teeth are well preserved ; two 

 slender and very prominent, and one lamelliform, posterior, oblique. 



Legumen appressus. Elongated, much compressed ; beak not prominent above the 

 hinge line ; hinge and base nearly parallel ; posterior extremity acutely rounded, and 

 nearly on a line with the hinge ; valves finely striated with close regular impressed 

 lines. 



Smaller and proportionally longer than the preceding. It came to hand too late 

 to be figured. 



DOSINIA, Scopoli. 



Dosinia densata. PL 34, fig. 13. Subtriangular or suborbicular, inequilateral, 

 rather thick in substance; length rather more than the height; concentric striae 

 obsolete, except towards the apex ; posterior side prominently wrinkled towards the 

 margin ; posterior margin obliquely truncated ; beaks not prominent. 



In old specimens the anterior margin is truncated, and rounded in the young, 

 which are more orbicular. The cardinal plate is broad, the teeth very prominent 

 and the anterior tooth of the left valve very thick inferiorly. 



This is the second species of Dosinia found in the American Cretaceous strata. 

 The first occurs in the older division. 



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