^ MOLLUSCOIDEA. 325 



Genus Clausa d'Orbigny. 



Clausa americana Gabb & Horn. 

 Plate XXn., Fig, ii 



1862. Fa^scipora Americana) G. & H., Jour. Acad. Nat. Sci. Phil., 



2d ser., vol. 5, p. 165, pi. 21, fig. 54. 

 1864. Pasciopora americana Meek, Check List Inv. Poss. N. A., 



Cret. and Jur., p. 4. 

 1868. Fasciopora Americana Con., Cook's Geol. N. J., p. 721,. 

 1905. Fascipora americana Johns., Proc. Acad. Nat. Sci. Phil, 



i905> P- 5. 



Description.-. — Zoarium irregularly branched or bifurcating, 

 usually composed of robust, clavate branches from .5 mm. to 1.5 

 mm. in diameter, sometimes more slender and tortuous. 

 Younger zooecia crowded at the extremities of the branches, 

 mature zocecia arranged irregularly upon the sides of the 

 branches, or in more or less distant longitudinal rows, the aper- 

 tures sub-circular, about .1 mm. in diameter, the distance be- 

 tween the apertures from one to four times their diameter, the 

 terminal portion of the zooecia slightly exsert. 



Remarks. — The broken branches of this species bear some 

 superficial resemblance to the branches of Diastopora Hneata, but 

 the branches of Diastopora are always tubular, while those of 

 Clausa are solid. 



Formation and locality. — Vincentown limesand, Vincentown 

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



Geographic distribution. — New Jersey. 



Family FASOIGERIDAE. 



Genus Fimfascigera d'Orbigny. 



Filifascigera megaera (Lonsdale). 



Plate XXII., Figs. 12-15. 



1845. Tubnlipora Megaera Lons., Quart. Jour. Geol. Soc. 



Lond., vol. I, p. 69, figs. a-b. 

 1862. Filifascigera megaera G. & H., Jour. Acad. Nat. Sci. 

 Phil, 2nd sen, vol. 5, p. 165, pi. 21, fig. 53. 



