MOLLUSCOIDEA. 327 



between, the lamellae and also their upper margins when perfect, 

 are non-celluliferous and are marked by radiating- strise. 



Remarks. — This little species is rather common at Vincentown, 

 and the more regular examples frequently have a strong super- 

 ficial resemblance to a minute cup coral. The species somewhat 

 resembles the European D. eudesii (Mich.), from the Upper 

 Cretaceous of France, but is a smaller form, and judging from 

 d'Orbigny's illustration, is much more irregular in its habit of 

 growth. 



Formation and locality. — Vincentown limesand, Vincentown 



(154). 



Geographic distribution. — New Jersey. 



Genus Lichenopora Defrance. 



Lichenopora papyracea (d'Orbigny). 



Plate XXII., Fig. 20. 



1852. Unitubigera papyracea d'Orb., Pal Franc, Terr. Cret., 

 Tom. 5, p. 761, pi. 643, figs. 12-14. 



Description. — Zoarium forming small, encrusting, subcircular 

 colonies, the maximum diameter of one colony being 4 mm. 

 Zooecia subcircular in outline or sometimes subpolygonal, about 

 .1 mm. in diameter, those towards the center of the zoarium 

 more or less covered with an epitheca indicating that the living 

 portion of the zoarium was around its outer border. 



Formation and locality. — Vincentown limesand, Vincentown 



(154). 

 Geographic distribution. — New Jersey. 



Family OBRIOPORIDAE. 



Genus Heteropora Blainville. 



Heteropora parvicella (Gabb & Horn). 



Plate XXIIL, Figs. 1-2. 



i860. Multicrescis parvicella G. & H., Proc. Acad. Nat. Sci. 



Phil, i860, p. 367. 

 i860. Multicresis parvicella Gabb, Jour. Acad. Nat. Sci. Phil., 

 2nd ser., vol. 4, p. 401, pi. 69, figs. 36-38. 



