242 NEW YORK STATE MUSEUM 



Strykersville ; Farnham creek, Lake Erie shore, three miles southwest of 



Angola. The originals of the L. 1 a e v e are from Varysburg and Warsaw, 



Wyoming co. 



Lunulicardium (Prochasma) absegmen sp. nov. 



Plate 3, fig. 15 



Shell of medium size, subcircular over the pallial region, broadly 

 pointed at the beak, the apical angle being about 45 . Behind the beak 

 the margin is incurved abruptly, thence rounds outward, downward and 

 upward in regular subcircular curvature, meeting the sical margin at the 

 middle of the shell. Sical margin oblique, longer than one half the length 

 of the shell, slightly arched. Surface depressed and evenly curved, smooth 

 or with only very obscure concentric striae. No radial markings visible. 



This species differs from L. bickense in its broader form, subcir- 

 cular marginal outline, absence of radial lines and obsolescence of the 

 plications beneath the beak; L. beushauseni, which it approaches in 

 outline, has strong subumbonal, posterior plications and fine radial lines 

 over the shell. In L. enode the sical margin is longer and more oblique. 



Habitat. Genesee province ; Chautauqua subprovince. Correll's point, 

 Lake Erie. 



Lunulicardium absegmen is very closely similar to L. con- 

 centricum (Martenberg) as described and figured by Holzapfel ' and 

 Beushausen, 2 but has a longer and more oblique sical margin. 



Lunulicardium (Prochasma) enode sp. now 



Plate 3, fig. 14 



Shell small, apical angle about 6o°. Anterior margin oblique, straight 

 and arched, extending five sevenths of the length of the valve. The basal 

 margin is oblique from the end of the hiatus and rather broadly recurved 

 posteriorly. The surface is marked only by very fine concentric lines. 

 This species may be distinguished from L. bickense by its much longer 

 sical margin. 



1 Op. cit. 1882. p. 33, pi. 6, fig. 10. 



2 Op. cit. 1895. p. 372, pi. 28, fig. n. 



