NORTH AMERICAN EARLY TERTIARY BRYOZOA. 531 



Occurrence. Middle Jacksonian: Wilmington. Xorth Carolina (rare); near 

 Lenuds Ferry, South Carolina (common) ; IT miles northeast of Hawkinsville, 

 Georgia (rare). 



Ootypes.C&i. No. 641 75, U.S.X.M. 



CHEILOPORA SPECULA, new species. 



Plate 09, tigs. 1-5. 



Description. '..-1\\& zoarium incrusts bryozoa and shells. The zooecia are 

 large, elongated, distinct, utricular; the frontal is convex, with numerous tremo- 

 pores. The a pert lira is elliptical, transverse; the poster is as large as the anter; 

 there are two salient cardelles ; the peristome is incomplete in front : the distal 

 part is extraordinarily developed, very long, semicylindrical. The ovicell is 

 endozooecial, convex, globular, somewhat salient, covered with tremopores like 

 the frontal. The two frontal avioularia are small, symmetrical, tubular. 



)A,(/=0.1-2-0.15mm. . rZz=0.90-1.00mm. 



Measurements. Apertura i, Zooecia^,. ,. ,__ 



Ufl=0.18-0.20 mm. lZs=0.7o-0.8o mm. 



Variations. This species is quite remarkable in the great development of a 

 part of its peristome. which forms a sort of wat-chtoicer above the apertura. This 

 appendage is often lobed or bifurcated. It is very often broken on our fossils 

 and it assumes the most varied and incoherent forms. It does not exist on the 

 ovicelled zooecia, which bear only two long, lateral, very salient palettes. It is 

 evident that this peristome is not in rapport with the passage of the eggs. It 

 appears to us to be simply like an apparatus (or more exactly like a trap) destined 

 to retain the diatoms serving as the habitual nourishment for the bryozoa. The 

 funnel-shaped gullet which terminates it superiorly confirms this hypothesis, for 

 it facilitates the issue of the streams of water. It is a perfect adaptation to the 

 principle of the flow of the liquids and of their decantation. For a long time the 

 bryozoa have invented such " spouts." 



Occurrence. Middle Jacksonian (Castle Hayne limestone) : Wilmington, 

 Xorth Carolina (common). 



Cotypes. Cat. Xo. 64178, U.S.X.M. 



CHEILOPORA SULCIFERA, new species. 



Plate 69, figs. 7, S. 



Description, The zoarium is unilamellar and creeps on algae. The zooecia 

 are distinct, lozenge-shaped, utricular: the frontal is convex; it is covered with 

 tremopores often transformed into sulci. The apertura is oval, transverse; it is 

 formed of a semilunar anter, separated by two condylcs from a wide, concave and 

 triangular rimule. The ovicell is endozooecial, small, transverse, little salient, 

 porous. The two frontal avicularia (?) are oblique, tubular, symmetrically placed. 



fAar=0.15 mm. [2=0.90-1.00 mm 



- Zooecia 



