NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
749 
Genus CRISULIPORA Robertson, 1910. 
1910. Crisulipora Robertson, The Cyclostomatous Bryozoa of tRe 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 Robertson, 1910. 
Range. — Vicksburgian-Recent. 
CRISULIPORA PROMINENS, new species. 
Plate 154, figs. 12-20. 
Description.— The segments are thin, elongated, somewhat claviform, triseriah 
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. 
M easurements . — ■ Separation of the peristomes 0.60 mm. 
Length of the peristomie 0.20 mm. 
Width of the segments-- 0.60-0.80 mm. 
V aviations. — 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, ligs. 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. 
