164 



PALEONTOLOGY OF NEW-roRK. 



558. 3. FENESTELLA ELEGANS {n. sp.). 



PL. XL D. Fig. la-g. 



Frond expanded or cup-shaped (often quite large) ; branches slender, frequently bifurcating ; 

 dissepiments thin and slender, scarcely enlarging at the junction with the branches. Fenestrules 

 on the non-celluliferous side oblong quadrangular, rarely oval ; branches striated by two or 

 three fine grooves which are scarcely visible ; celluliferous side of branches with a thin low 

 edge margined on each side by a row of small oval cells, about four or five to each fenestrule ; 

 cells with the longitudinal diameter oblique to the direction of the branches : sometimes the 

 edge of the branch is grooved longitudinally between the rows of pores. 



Fenestrules about seven in the space of three lines longitudinally, and twelve in the same 

 space transversely. 



This beautiful and delicate species is readily distinguished by its slender branches, which, on 

 the non-celluliferous side, are scarcely distinctly striate ; and on the celluliferous side, the 

 oval, obliquely arranged pores, which are very conspicuous, opening more directly upward 

 than in the preceding species. The cells are more or less prominent, depending on the degree 

 of wearing they have suffered, and from this cause also the form may slightly vary. In some 

 specimens, the elevated margins of the pores have the appearance of extending beyond the edge 

 of the branch. 



Fig. 1 a. A portion of a frond, showing the non-celluliferous side. The specimen is on shale, 



and, being partially removed, shows, in the upper lefthand side, the impression of the 



celluliferous face. 

 Fig. \ b. A portion enlarged, showing the form of fenestrule, striated surface of branches, etc. 

 Fig. 1 c. The impressions of the celluliferous side in the shale. 



As these fossils occur in shale, from which the coral is often separated without 



presenting its peculiar features, the species may often be detected by the impression. 



This differs from the following species in being less deep, and the transverse bars 



almost as strongly marked as the branches. 

 Fig. 1 d. A fragment showing the celluliferous side of the coral. 

 Fig. 1 e. The same enlarged, showing the form and arrangement of the cells. 

 Fig. 1 /. Another specimen of the celluliferous side. 

 Fig. 1 g. The same enlarged, showing the form and appearance of the cells where the surface 



is somewhat worn. 



This species approaches very closely to the F. tejiuis of the Clinton group; but in 



that species the pores are round and prominent, and I have not been able to see them 



of the oval form. 



Position and locality. In the shale of the Niagara group, and also in the thin calcareous 

 layers in the same rock at Lockport, Rochester and other places. (State Collection.) 



