258 NEW YORK STATE MUSEUM 



Honeoyea major sp. nov. 



Plate 6, fig. 1^14 



This is a species of larger size than the H. e r i n ace a, and relatively 

 narrower over the pallial region, the posterior margin being longer and 

 more oblique. The general aspect and surface markings of the two are the 

 same, but in H. major the number of primary ribs is limited to nine or 

 ten. These differences permit the ready distinction of the species. 



Honeoyea major is a more abundant shell than H. erinacea, 

 though we have observed no specimens so well preserved as those of the 

 latter. 



Habitat. Genesee province; Naples subprovince. In the shales at 

 Naples and vicinity, rarely in the flagstones of the middle and upper 

 portions of the group ; also in the shales at the lower Portage falls. 



Honeoyea styliophila sp. nov. 



Plate 6, fig. 4-1/ 



Shell relatively large, suborbicular, beak subcentral, slightly anterior; 

 posterior crescentic margin short, slightly incurved, nearly transverse and 

 usually obscure, the inflected surface being quite oblique ; anterior margin 

 longer. Lower margin quite regularly rounded. Valves convex, subro- 

 tund in the umbonal region, umbones incurved. 



Surface with six to eight strong primary ribs, crested medially as in 

 H. erinacea and H. major; as in these species also there are 

 normally four fine lamellar lines between each two ribs, but in old shells 

 this character is obscured by the union of the radial lamellae to form a 

 single strong plication. The crescentic ridge is low and shows no spinous 

 processes on its surface. 



Dimensions. A specimen retaining the normal proportions of the 

 shell has the following: length 22 mm, width 24 mm, length of crescent 

 11 mm, length of hiatus 23 mm. 



Though the feeble development of the posterior crescent gives this 

 species a more orbicular outline than is typical in this group, yet its other 



