NORTH AMERICAN EARLY TERTIARY BRYOZOA. 749 



Genus CRISULIPORA Robertson, 1910. 



1910. Crixulipora ROBERTSON, The Cyelostomatous Bryozoa of the West Coast of North 

 America, University of California Publications Zoology, vol. 6, p. 254. 



Zoarium dendroid, calcareous, composed of segments or internodes united by 

 chitinous joints. Zooecia tubular, disposed in several alternate rows. Ooecium an 

 inflation of the surface of an internode. (Robertson) Oeciostome tube narrower 

 than the zooecial tube, without any terminal expansion. Ten tentacles (Waters). 



Genotype. Crisulipora occidentalis Eobertson, 1910. 



Range. Vicksburgian-Recent. 



CRISULIPORA PROMINENS, new species. 



Plate 154, figs. 12-20. 



Description. The segments are thin, elongated, somewhat claviform, triserial. 

 The tubes are distinct, cylindrical, bent upward, terminated by a salient peristomie 

 elevated to 45; the peristome is thin, salient, orbicular, oblique. The ovicell is 

 sacciform, globular, striated transversally, the oeciostome is a tube smaller and 

 less salient than an ordinary tube, directed upward. The basal lamella is orna- 

 mented with transverse, much scatered wrinkles. 



Diameter of the peristome 0.12 mm. 



Distance between the peristomes 0.40-0.60 mm. 



Measure m cnts. 



Separation of the peristomes 0.60 mm. 



Length of the peristomie 0.20 mm. 



Width of the segments _ 0.60-0.80 mm. 



Variations. The segments of the base of the zoarium are not similar to the 

 others; they are more simple and biserial. The length and width of the segments 

 are quite variable just as is their general aspect; we have figured some of them. 



This species differs from Crisulipora rugosodorsalis in its segments which are 

 triserial and not pluriserial, and in the dimensions of its much smaller ovicell. 



Occurrence. Vicksburgian (Marianna limestone) : One mile north of Mon- 

 roeville, Alabama (very rare) ; West bank Conecuh River, Escambia County, 

 Alabama (rare). . 



Cotypes. Cat. Nos. 65386, 65387, U.S.N.M. 



CRISULIPORA RUGOSODORSALIS, new species. 



Plate 154, figs. 25-29. 



Description. The segments are pluriserial, fusiform, swollen. The tubes are 

 distinct, cylindrical, curved, arranged in regular quincunx, terminated by an 

 oblique salient peristomie; the peristome is thick, orbicular, little oblique. The 

 ovicell is very convex, voluminous, punctate and striated transversally, surround- 

 ing almost all the tubes of a segment; the oeciostome is a smaller tube adjacent to 

 another. The dorsal face is ornamented with large, transverse, scattered wrinkles; 

 it is very often concave. 



