NAPLES FAUNA IN WESTERN NEW YORK, PART 2 259 



surface characters indicate its affiliation herewith. It is very much the 

 largest representative of the genus. 



Habitat. Genesee province; Naples subprovince. Not uncommon 

 in the Styliola limestone, on the shores of Canandaigua lake. 



Honeoyea simplex sp. nov. 



Plate 6, fig. 1-3 



Shell small, subtriangular, basal margin rounded, anterior edge gently 

 convex, posterior margin concave. Beak situated behind the median line 

 of the shell, oblique and directed backward. Posterior crescent sharply 

 defined, concave ; its outer margin makes a broad, somewhat thickened and 

 elevated ridge, forming the apparent posterior margin of the valve when 

 viewed from above. The crescent wall is shorter and more oblique than 

 the sical margin and strongly incurved. The latter is slightly ecurved and 

 considerably arched upward, the hiatus extending nearly if not quite the 

 full length of the antelateral margin. The sical edge is effected and 

 smooth, just within it is a low moderately wide groove, and above that the 

 abrupt curve of the anterior slope of the valve. 



Surface sloping rather gradually from above the center of the valve to 

 the basal margin and to the crescent ; anteriorly the slope is abrupt from 

 the crescent ridge which forms the highest part of the valve. The orna- 

 mentation consists of simple, continuous, slightly flattened and closely set 

 plications, about 30 in number. The surface of the crescent is smooth or 

 finely radiate, as is likewise the surface of the sical furrow ; a few plications 

 extend on to the anterior slope above the furrow. 



This species is based on a single, well preserved right valve, whose 

 length is 5.5 mm, width 5 mm, length of lunule 3 mm, and length of 

 hiatus 4 mm. 



Habitat. Genesee province ; Naples subprovince. Styliola limestone, 

 Canadaigua lake. 



