MOLLUSCOIDEA. 317 



1864. Blast opora lineata Meek, Check List Inv. Foss. N. A., 



Cret. and Jur., p. 4. 



1868. Diastopora lineata Con., Cook's Geol. N. J., p. 723. 

 1905. Diastopora lineata Johns., Proc. Acad. Nat. Sci. Phil., 



1905, P- 5- 



Description^ Zoarium encrusting at the base, afterwards 

 rising in an enrolled plate or tortuous, branched tube with, thin 

 walls and a diameter of from i to 2 mm. The back of the 

 zoarium in the tubular portion, or the inner surface of the tubes, 

 covered with an irregularly striated epitheca. Zocecia small, 

 the apertures circular and slightly elevated above the general 

 surface, about .25 mm, or a little less in diameter, arranged more 

 or less irregularly but frequently with a quincuncial tendency, 

 the spaces between the apertures being from one to five times 

 their diameter; the immersed portion of the zocecia often dis- 

 tinctly rounded and bounded on each side by a depressed line, 

 sometimes with a median longitudinal rib and one or two lateral 

 ones on each side ; behind the aperture the surface usually slopes 

 regularly to the common surface of the zoarium. 



Remarks. As it usually occurs, this species is represented by 

 broken portions of the tubular parts of the zoarium, the basal 

 incrusting portion being less common. Specimens of this char- 

 acter can be easily recognized by the thin walled tubes whose 

 inner surface is covered by the irregular, annular striations of the 

 epitheca. 



Formation and locality. Vincentown limesand, Vincentown 

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



Geographic distribution. New Jersey. 



Family IDMONBIDAB. 



Genus RSTICUUPORA d'Orbigny. 



Reticulipora sagena Gabb & Horn. 



1860. Reticulipora sagena G. & H., Proc. Acad. Nat. Sci. Phil., 



1860, p. 366. 

 1860. Reticulipora sagena Gabb, Jour. Acad. Nat. Sci. Phil , 



2d sen, vol. 4, p. 400, pi. 69, figs. 30-32. 



