NAPLES FAUNA IN WESTERN NEW YORK, PART 2 237 



by this method. This is a very peculiar feature which serves to distinguish 

 the species. 



The original specimen has a length and hight of 17 mm. 



Habitat. Genesee province ; Chautauqua subprovince. Forestville, 



Chautauqua co. 



Lunulicardium velatum sp. nov. 



Plate 2, fig. 7-9 



Shell of moderate size, vertically subovate in outline. Sical margin 

 short, oblique, not extending to the middle of the shell, direct or gently 

 incurved, making an angle of about ioo° with the posterior margin ; 

 posterior margin rounding and closely incurved at the beak, curvature of 

 the pallial margin subsemielliptic. 



Surface gently and evenly convex ; marked by exceedingly fine radial 

 lines which are separated by sharply incised furrows much narrower than 

 the lines themselves. The elevated lines are filiform over the earlier 

 portions of the shell, but become flattened toward the margins. They 

 increase by very gradual dichotomy so that above the middle of the valves 

 they are often of unequal size. At about the middle there are 10 of the 

 lines in the space of 1 mm, but at the lower margin of the valve these have 

 broadened so that six fill this space. The lines are crossed at very minute 

 but approximately regular intervals by concentric linear striae and also by 

 regular concentric lines of growth which multiply toward the margins. 



None of the observed specimens of this species have preserved the 

 outline of the valves in perfection, the character of the ornamentation of 

 the shell being the feature on which main reliance is for the present placed 

 as a means of specific distinction. 



In the largest specimen the hight of the shell is 18 mm, its length 

 approximately 23 mm ; the length of the sical margin approximately 13 mm. 

 Other fragments indicate a somewhat smaller size. 



Habitat. Genesee province ; Naples subprovince. Base of Hatch hill 

 and Parrish gully, Naples. 



