NAPLES FAUNA IN WESTERN NEW YORK, PART 2 235 



in number by very gradual intercalation, and are covered by numerous 

 minute, concentric lines which produce a very fine cancelation of the 

 surface. 



A specimen of normal size has a length of 13 mm, a width of 17 mm. 



Habitat. Genesee province ; Naples subprovince. Briggs's gully, 

 Honeoye lake ; Whetstone gully near Livonia, Livingston co., associated 

 with Cyrtoclymenia neapolitana. 



Lunulicardium (Chaenocardiola) eriense sp. nov. 



Plate 4, fig. 3-6 



Shell of medium size, oval-acuminate in outline, with long, oblique 

 posterior truncation. Beak slightly projecting ; anterior curve subcircular 

 or broadly elliptic. Length but slightly less than the hight of the shell. 

 The sical margin is straight and makes an angle at the beak of 45 to the 

 vertical axis. Its length is from five sixths to nine tenths the hight of the 

 shell. 



Surface covered with exceedingly fine radial lines, which are from 60 

 to 80 in number, somewhat more than half the number in L. parun- 

 cuius, and always straight, not wavy as in that species. These lines are 

 coarser on the posterior margin near the beak and there crenulate the 

 margin. Concentric markings are scarcely visible except as low undulations, 



This species approaches in some particulars L. clymeniae and 

 L. velatum, but is not so extremely truncate posteriorly as the former, 

 nor are the radial striae cancelated by concentric lines. 



Dimensions. Hight and length in normal examples, about 20 mm. 



Habitat. Genesee province ; Chautauqua subprovince. In the shales 

 at Correll's point, Lake Erie, and Forestville. 



Lunulicardium (Chaenocardiola) hemicardioides sp. nov. 



Plate 2, fig. H-16 



Shell small, subovate triangular, with acute umbones ; sical margin 

 very long, nearly or perhaps quite attaining the axial length of the valves ; 

 these margins are arched and attain the greatest convexity of the shell. 



