NAPLES FAUNA IN WESTERN NEW YORK, PART 2 245 



concentric lines of growth are visible over the surface, specially near the 

 margins. 



This species is readily recognized by its unusual form and contour, and 

 its striated sicae. 



Habitat. Genesee province ; Chautauqua subprovince. Johnson's 



falls, near Strykersville, Wyoming co., and the lower Portage falls of the 



Genesee river. 



Lunulicardium sp. nov. 



Plate 2, fig. 21 



A small shell of orbicular triangular outline, has a large apical angle, 

 long sical margin, the latter making about. 45 with the vertical axis, the 

 beak is slightly posterior, the surface quite uniformly convex with an 

 abrupt turn downward near the periphery and a low broad sulcus just 

 within the sical edge, which is slightly turned upward. The surface is 

 covered with very fine concentric lines which traverse the sical groove. 

 About the margins are evidences of radial plications, but no trace of these 

 appears over the body of the shell. 



Dimensions. The single specimen, a right valve, measures in hight 

 9 mm, length 10 mm, length of sical margin 9 mm. This shell is quite 

 unlike any of the other species here described, both in form and character 

 of surface. 



Habitat. Genesee province ; Naples subprovince. In the black Gene- 

 see shale just above the Genundewa limestone at Seneca point, Canan- 



daigua lake, N. Y. 



Lunulicardium sp. nov. ? 



Plate 2, fig. 19 



A species distinct from the foregoing is represented by a single speci- 

 men whose outline is acuminate subtriangular. The umbo is subcentral ? 

 relatively long and narrow, the apical angle approximately 30 . The sical 

 margin is long and slightly incurved, but does not reach for the full extent 

 of the valve. The lower margin is nearly semicircular, the anterior margin 

 incurved. The center of convexity is near the middle of the valve and 

 toward the sical margin. The surface shows evidences over the pallial 

 region of coarse plications ; there are also a few strong concentric growth 



