350 CRETACEOUS PALEONTOLOGY. 



Family PORINIDAB. 



Genus PORINA d'Orbigny. 



Porina labiata (Gabb & Horn). 



Plate XXVI., Figs. i-6. 



1862. Crescis labiata G. &. H., Jour. Acad. Nat. Sci. Phil., 2nd 



ser., vol. 5, p. 177, pi. 21, fig. 69 

 1864. Crescis labiata Meek, Check List Inv. Foss. N. A., Cret. 



and Jur., p. 4. 

 1868. Crescis labiata Con., Cook's Geol. N. J., p. 723. 

 1905. Crescis labiata Johns., Proc. Acad. Nat. Sci. Phil, 1905, 



P- 5- 



Description. — Zoarium consisting of flattened branches, which 

 divide irregularly, varying from 0.6 mm. to 2 mm. in width, the 

 thickness being about one-half or a little more than one-half the 

 width, and the cross section subelliptical. Zooecia occupying both 

 sides of the branches, scattered or arranged more or less regularly 

 in rows; the apertures circular, usually bordered by a slightly 

 raised, rather broad rim ; mesopores very small, scattered between 

 the zocecia. Certain of the zooecia are modified to form ovicells 

 by the inflation of the surface of the zoarium at one side, giving 

 to the aperture an oblique direction; these ovicells are scattered 

 irregularly over the surface, sometimes being nearly absent, while 

 in other specimens nearly every zooecium has been so modified. 



Pormation and locality. — Vincentown limesand, Vincentown 

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



Geographic distribution. — New Jersey. 



Porina quadrangularis (Gabb & Horn). 

 Plate XXVI., Figs. 7-8. 



1862. Bntalophora quadran-gularis G. & H., Jour. Acad. Nat. 



Sci. Phil., 2nd ser., vol. 5, p. 170, pi. 21, fig. 58. 

 1864. Bntalophora quadrangularis Meek, Check List Inv. Foss. 



N. A., Cret. and Jur., p. 4. 

 1868. Bntalophora quadrangularis Con., Cook's Geol. N. J., p. 



723- 



