NORTH AMERICAN EARLY TERTIARY BRYOZOA. 279 



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

 North Carolina (common) ; Eutaw Springs, South Carolina (common) ; near 

 Lenuds Ferry, South Carolina (common). 



Cotypes. Cat. No. 64015. U.S.N.M. 



Genus QUADRICELLARIA D'Orbigny, 1850. 



ISoO. QiiddriceUnria D'ORBIGNY, Palfiontologie franchise, Terrain cr6tac6, Bryozoaires, p. 32. 



Zoarium articulated; segments quadrangular; two opposite faces with large 

 zooecia and the other two with small zooecia. 



Genotype. Quadricellaria elegans D'Orbigny. 



Range. Turonian-Senonian. 



D'Orbigny's genus is rather well delimited, but it has been extended to include 

 all forms with rectangular zoaria. Moreover, it is more of a zoarial form than a 

 thoroughly established genus. 



The two species which we doubtfully classify in Quadricellaria have in effect 

 quadrangular segments, but their affinities are with Macropora. The specimens are 

 not ovicelled and can not be positively classified generically at the present time. 



QUADRICELLARIA (?) LACINIOSA, new species. 

 Plate 40, figs. 18-20. 



Description. The zoarium is articulated, with segments quadrangular; each 

 face bears on each zooecium a large slit in the form of a crescent. The zooecia 

 are quite elongate, distinct, formed of two parts. A shallow, very finely punctate 

 cryptocyst and an inferior triangular gymnocyst. The aperture is semilunar and 

 surrounded by a prominent peristome; the proximal border is straight with two 

 small lateral slits. The ovicell is endotoichal. 



fA#=0.08mm. . fZs=0.50mm. 



Measurements. Aperture , ,. /ooecia 7 _,__, 



Ua=0.06 mm. (13=0.22 mm. 



Affinities. The zooecia are joined back to back and arranged in alternating 

 pairs at right angles, as in Dimetopia. 



This species is not a Quadricellaria and certainly belongs to a new genus, 

 nlthough different from the genus represented in Quadricellaria burnsi. To create 

 this genus one should know the ovicell and possess many specimens. We have only 

 collected three segments. 



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

 Carolina (very rare). 



Cotypes. Cat. No. 64013, U.S.N.M. 



QUADRICELLARIA <?) BURNSI, new species. 

 Plate 40, fig. 21. 



Description. The zoarium is articulated and radicellated ; it contains a row 

 of zooecia on each of the four faces. The zooecia are quite elongate, distinct, bor- . 

 dered by a very slightly elevated mural rim ; the cryptocyst is smooth and shallow. 



