246 NEW YORK STATE MUSEUM 



lines. A very small portion of the exterior shows an exceedingly fine, 

 undulating ornamentation of elevated closely set lines. 



The length of this single observed specimen (left valve) is 12 mm; its 

 width 16 mm. 



Habitat. Genesee province ; Naples subprovince. Styliola limestone. 



Canandaigua lake. 



Lunulicardium sp. nov. ? 



Plate 4, tig. 1 1 



A single fragment of a left valve indicates a large elongate oval 

 species with rather coarsely but obscurely plicated surface. A fragment of 

 a much larger shell from Forestville presents similar characters. Neither 

 of these can be identified with any species here or elsewhere described. 



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



Lunulicardium ? ( Opisthocoelus ? ) transversale sp. nov. 



Pl.it e 4, fig. 16 



This name is applied to a small shell, undistorted but of peculiar habit 

 in its elongate transverse outline. From its subcentral beak the anterior 

 dorsal margin extends in nearly a transverse line for one half the length of 

 the shell while the posterior dorsal line is more oblique. The anterior 

 extremity curves narrowly, and the margin below it is broadly sinuated by 

 a depression from the umbo. The basal margin is transverse, rising 

 gradually to the narrow posterior extremity. The surface is convex in the 

 umbonal region, sloping most gradually to the basal margin. A low 

 ridge lies on the anterior moiety, separated from the anterior edge by 

 a broad depression. Beneath and in front of the beak, in the place of 

 the hiatus, is a smooth, elongate triangular and vertical lunular surface 

 without hiatus, the edge coming down to the plane of commissure. Behind 

 the beak the margin is incurved and erect. 



The ornament consists of fine, sharp, round, simple, elevated radial 

 lines about 60 in number, a little coarser and more widely separated on the 

 anterior surface, and the intervals between them may vary somewhat over 

 the shell. 



Dimensions. The single left valve observed is 6 mm in length and 

 2.5 mm in hight. 



