SECONDARY AND TERTIARY FORMATIONS OF NORTH AMERICA. 149 



mouth and marked above by an impressed circle or ellipse, circumscribing a large 

 almost hemispherical portion covering nearly the whole of its surface. 



From the Cretaceous of Timber Creek, N. J. Rare. 



This peculiar species can be distinguished by its very curious ovicell, and by the 

 fact that the portion of the true cellule, pierced by fossets, does not, in most cases, 

 cover the whole cellule ; thus causing the appearance that the cellules are separated, 

 as in Mollia and some other genera. On examining a broken surface, we can trace the 

 dividing walls of the cellules, which are thin and in contact. The superficial fossets 

 are nearly ten in number, often there is a terminal one, and occasionally we find an 

 odd one interpolated on one side. They are very often not placed directly opposite 

 each other in pairs. Sometimes the margin bounding the cribrate portion of the sur- 

 face is very abrupt internally, and merges so insensibly into the smooth portion of 

 the surface outwardly, that no line of division can be drawn, and the middle part of 

 the cellule appears somewhat sunk below the level of the surrounding parts. 



As to the mode of growth, we believe it to be in plates, because the specimen we 

 possess seems to be too broad for the ordinary dichotomous form, and, in addition, 

 there is a smaller piece attached at an acute angle, in the usual manner of the anas- 

 tomosing of broad plates. 



E. Abbottii, n. s., fig. 33. — Colony in a plate (?). Cellules large, oval, generally 

 in lines and irregular quincunx; sometimes there is a slight space between the cel- 

 lules, most elevated at the edge of the cellules and depressed between them. Mouth 

 round to subquadrate, bordered by a thickened lip, most prominent at the distal and 

 lateral margins, and continued around the " special pores." These pores are oblique, 

 widest at the proximal end, taparing anteriorly, and are placed aside of or a little be- 

 hind the mouth. Surface of the cellule flat, sometimes a little sunk : rarely bordered 

 by a rim, and always pierced by about seven pairs of fossets, the last one or two pairs 

 of which are radiating. 



The large broad oval cellules of this species, generally in contact with each other, 

 and marked by at least seven pairs of fossets, will distinguish this pretty species from 

 any other yet known in this formation. The cellules resemble somewhat our species 

 Repiescharipora marginata, but the aperture is smaller, the cellules are closer together, 

 and there are always in this species two more pairs of fossets than in the latter. We 

 have seen no ovarian vesicles. 



From the Cretaceous, near Mullica Hill, N. J. Two small fragments are all we 

 have seen of this pretty species. We dedicate it to Mr. C. C. Abbott, to whom we 

 are indebted for this and many other new forms. 



E. immersa, n. s. — Colony in large, thick, tortuous, anastomosing plates. Cel- 

 lules on both sides; elongated oval, with the sides parallel. Mouth occupying the 

 whole width of the obvious portion of the cellule and one-fourth to one-fifth of its 



