MOLLUSCOIDEA. 337 



Membranipora perampla Gabb & Horn. 

 Plate XXIV., Pig. 4. 



1862. Membranipora perampla G. & H., Jour. Acad. Nat. Sci. 



Phil., 2nd ser., vol. 5, p. 158, pi. 20, fig. 42. 

 1864. Membranipora perampla Meek, Check List Inv. Foss. N. 



A., Cret. and Jur., p. 3. 

 1868. Membranipora perampla Con., Cook's Geol. N. J., p. 723. 

 1905. Membranipora perampla Johns., Proc. Acad. Nat. Sci. 



Phil., 1905, p. 5. 



Description. — Zoarium encrusting, growing upon other bry- 

 ozoa and upon shells. Zooecia forming a single layer, more or 

 less regularly hexagonal in outline, usually about .45 mm. in 

 length with the width two-thirds the length, arranged in quin- 

 cunx, not surrounded by a distinct depressed line, though at the 

 angles the surface is usually slightly depressed. Aperture large, 

 elliptical or sometimes nearly circular in outline, the zooecial 

 walls thin. Both ovicells and avicularia rare or entirely wanting. 



Formation and locality. — >yincentown limesand, Vincentown 

 (154), near MXilHca Hill (Gabb and Horn). 



Geographic distribiUion. — New Jersey. 



Genus Pyripora d'Orbigny. 

 Pyripora irregularis Gabb & Horn. 

 Plate XXIV., Fig. 5. 



i860. Hippothoa irregularis G. & H., Proc. Acad. Nat. Sci. 



Phil, i860, p. 366. 

 i860. Hippothoa irregularis Gabb, Jour. Acad. Nat. Sci. Phil., 



2d ser., vol. 4, p. 400, pi. 69, figs. 18-20. 

 1862. Pyi'ipora irregularis G. &. H., Jour. Acad. Nat. Sci. Phil, 



2d ser., vol. 5, p. 157, pi. 20, fig. 40. 

 1864. Pyripora irregularis Meek, Check List Inv. Foss. N. A., 



Cret. and Jur., p. 3. 

 1868. Pyripora irregularis Con., Cook's Geol. N. J., p. 723. 

 1905. Pyripora irregularis Johns., Proc. Acad. Nat. Sci. Phil., 



I90S> P- 5- 



22 PAL 



