SECONDARY AND TERTIARY FORMATIONS OF NORTH AMERICA. 127 



The mouth generally opens upward, but occasionally it is seen pointing obliquely 

 forward. 



From the yellow, cretaceous limestone, Timber Creek, N. J. 



C. cycloris, n. s., fig. 9. — Colony encrusting, composed of cellules arranged in very 

 irregular quincunx, with a radiating tendency. Cellules broadly oval, narrowed an- 

 teriorly, prominent, convex, separated by deep lines caused by the meeting of very 

 convex surfaces. Mouth circular, bounded by an elevated, thickened rim, which is 

 prolonged into a very prominent lip at the proximal side of the mouth, as in fig. 9, b, 

 representing an ovarian vesicle in advance and the lip behind the mouth. Surface 

 smooth. Ovarian vesicles numerous, small, broadly convex, and in every instance 

 exhibiting their special mouths distinctly separated from the ordinary aperture of the 

 cellule by a flat plate. 



We have seen but one colony of this species. It is in the collection of the Acad. 

 Nat. Sciences. It is encrusting a specimen of Orbitolites MantelHi from the Eocene 

 (of Ala.?) 



The very abrupt distal extremity of the cellules, the round mouth and the promi- 

 nent lip at its proximal edge, will serve to distinguish this species. The colony from 

 which the above description was taken consists of about sixty cellules. The first ten 

 or twelve are arranged radiately around a common centre, while the remainder all 

 start from the same side. Most of the cellules are smooth on their surface, but a few 

 present asperities, due apparently to a deposition of calcareous matter. 



C. inornata, n. s., fig. 10. — Colony encrusting, composed of cellules arranged in 

 irregular quincunx and radiating lines. Cellules slightly convex, oval, separated by 

 depressed lines. Mouth terminal, bounded by a delicate rim anteriorly which is not 

 thickened; ovoid, broadest in advance, generally emarginate at its two posterior 

 corners, variable in size and form, sometimes rounded-triangular with the base 

 anterior. Ovarian vesicles small, not prominent, acuminate anteriorly. Surface plain 

 or occasionally faintly undulated, undulations transverse when present. 



The oval, plain, small cellules, with the mouth ovoid to subtriangular, occasionallv 

 emarginate at the angles, and produced at the middle proximal margin, will at once 

 distinguish this unpretending little species. The ovarian vesicle is sometimes much 

 broader than shown in the figure, sometimes attaining as great a width as the cellule 

 itself. 



We have seen but one colony. It is from the Eocene of Alabama, probably from 

 the famous Claiborne locality. Coll. Academy. 



C. tumidula, d'Orb., Pal. For. p. 399, vol. 5. 



EscJiarina tumidula, Lonsdale, Quart. Jour. Geol. Soc. vol. 1, p. 502. fig. 



E. tvmidula, d'Orb., Prod. Pal. Strat. 



33 



