MOLLUSCOIDEA. 331 



1862. Eschar a digitata G. &. H., Jour, Acad. Nat. Sci. Phil., 



2d ser., vol. 5, p. 114. 

 1864. Hschara digitata Meek, Check List Inv. Foss. N. A., Cret. 



and Jur., p. 3. 



1868. Pliophlae sagena Cook, Geol. N. J., p. 376, fig. 

 1868. Hschara digitata Con., Cook's Geol. N. J., p. 722. 

 1901. Hschara (ff) digitata Ulrich, Md. Geol. Surv., Eocene, 



p. 216, pi. 60, figs. lo-n. 



Description. "Zoarium bifoliate, branching dichotomously ; 

 branches flattened, acutely elliptical in cross-section, usually 2.5 

 to 3.0 mm. wide. Zocecia hexagonal, regularly arranged in quin- 

 cunx, about 0.55 mm. long and 0.38 wide, bounded by a slightly 

 impressed line ; surface concave, especially toward the aperture 

 which is situated usually just in front of the center. Aperture 

 semielliptical, rounded in front, straight behind, o.io to 0.12 mm. 

 wide. Normally developed and perfect, the posterior border of 

 the aperture is slightly raised and bears a delicate lunarium-like 

 curved plate which extends into the aperture. Abortive cells, 

 possibly of the nature of vicarious avicularia, are frequent, but 

 seem to be entirely restricted to the edges of the zoarium and to 

 those portions lying just beneath the axes of bifurcation. They 

 are distinguished from the other cells by their subcircular and 

 usually much smaller apertures. Ocecia unknown." (Ulrich). 



Remarks. This is by far the most abundant species of bry- 

 ozoan in the Vincentown beds of New Jersey. At times its broken 

 zoaria constitute a large percentage of considerable beds, the 

 species occurring almost to the exclusion of all others. All other 

 species of bryozoans in this fauna are rare as compared with this 

 one. 



Formation and locality. Vincentown limesand, Vincentown 

 (154), Timber Creek and near Mullica Hill (Gabb and Horn). 



Geographic distribution. New Jersey. 



Genus BIFLUSTRA d'Orbigny. 

 Bifulstra torta Gabb & Horn. 



Plate XXIIL, Figs. 11-12. 



1862. BMustra torta G. & H., Jour. Acad. Nat. Sci. Phil., 2nd 

 ser., vol. 5, p. 152, pi. 20, fig. 36. 



