NAPLES FAUNA IN WESTERN NEW YORK, PART 2 233 



tion is confined to certain plications and the rest simply increase in width. 

 There are very fine concentric striae crossing the plications and occasion- 

 ally low undulations in the umbonal region. 



This is a species of the type of Pinnopsis, but is very unlike the eastern 

 forms in the irregularity of its plication. 



Habitat. Genesee province ; Chautauqua subprovince. Terry's ravine, 

 Forestville, and above the black shales at Fox's point, Lake Erie. It has 

 also been found in the Wiscoy shales above the Portage sandstones on 

 Wiscoy creek, Allegany county. 



Lunulicardium (Pinnopsis) wiscoyense sp. nov. 



Plate 1, fig. 7 



Diagnosis. Shell small, ovate, acuminate, apical angle 40 . Sical 

 margin arched, oblique, direct, one half the hight of the shell. Marginal 

 curve of the pallial region ■semielliptic, posterior margin broadly rounded. 

 Surface plicate, the ribs being simple, continuous, strong and rounded, 

 separated by furrows of equal width. Thirty of these ribs may be counted 

 at the basal margin. They are crossed by very fine concentric lines. 



This shell has in some measure the aspect of a small L. acu ti- 

 ro strum or L. ornatum, but it may be distinguished by having 

 rounded and more distant plications, and considerably fewer than those 

 species at a corresponding growth stage. 



Habitat. Genesee province. In the Wiscoy shales above the Portage 

 sandstones, Wiscoy creek, upper Genesee valley, Allegany county. 



Lunulicardium (Pinnopsis) accola sp. nov. 



Plate 4, fig. 12, 13 



Shell rather small for the plicated species, outline suborbicular, surface 

 regularly convex, beak slightly posterior, subcentral. Sical margins extend- 

 ing for nearly one half the hight of the shell and quite straight. The 

 plications are sharply defined, rounded and separated by concave intervals 

 equal to them in size ; they are simple and continuous, increasing very 

 slowly and sparsely ; they number 38 on the original specimen. These 



