NAPLES FAUNA IN WESTERN NEW YORK, PART 2 



2 55 



narrowly convex in the umbonal region, and from the posterior side of the 

 umbo a broad depression extends to the margin. Shell thin as in other 

 species, marked only with concentric striations. 



Dimensions. An average specimen has a hight of 4 mm, a length of 

 3.5 mm, and length of byssus is 3 mm. 



Observations. This shell occurs abundantly in the locality cited, but 

 has not been observed elsewhere. It seems to take the place, in the succes- 

 sion here, of the common P. f ragilis of more easterly localities. 



Habitat. Genesee province; Naples subprovince. In the lower soft 

 shales on Cashaqua creek. 



HONEOTEA gG n - nOV. 



This name is proposed for a group of small shells showing some affini- 

 ties with Lunulicardium, but, if we have oriented them correctly, distinct in 



Fig. 9 Honeoyea erinacea. Anterior view showing the arch of the valve at the byssal hiatus, the form of the- 

 posterior crescent and the triangular cardinal area. 



Fig. 10 The same, showing crescent and umbonal ridge with spine bases. 



important respects. In these the beak is minute, opisthogyre and inflected 

 and the umbonal slopes to the commissure are abrupt. On the long, 

 oblique anterior margin is an hiatus or byssal opening bounded by 

 arched margins, on which the sicae are but very faintly developed, 

 being thin, narrow, concave, and effected, not vertical as in the Lunuli- 

 cardia. Behind the beak is an oblique, vertical or concave crescentic wall, 

 set off from the body of the shell by a lunate curve ; the edges of this 

 lunulelike division meet in the plane of commissure with no opening 

 between. This feature is conspicuous, and its upper bounding ridge is 

 thickened and crested, in the typical species (H. erinacea) becoming 

 spinous. This depression extends for the entire length of the postlateral 

 slope, is nearly as long as the byssal gap, and its surface is crossed by 



