NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
413 
Occurrence. — Vicksburgian (“Chimney rock” of Marianna limestone): One 
mile north of Monroeville, Alabama (rare). 
In Europe this variety has been observed since the Helvetian in the same 
countries as the type species itself, but it has never been mentioned as recent. 
It is remarkable that Peristomella coccinea Abildgaard, 1805, has disappeared 
from the western Atlantic and from the Gulf of Mexico since the commencement 
of the Miocene. 
Plesiotype. — Cat. No. 64282, IJ.S.N.M. 
PERISTOMELLA LATICELLA, new species. 
Plate 54, figs. 5-7. 
Description. — The zoarium incrusts shells and bryozoa or creeps over algae. 
The zooecia are distinct, wide, aliform ; the frontal is convex, smooth, surrounded 
by a line of crowded areolae; it is formed of an olocyst covered over and intimately 
united with a pleurocyst. The aperture is very oblique (about 45°) semilunar, 
transverse, hidden under a salient and wide mucro; the proximal part of the 
peristome bears four large spines. The ovicell is hyperstomial, but embedded in 
the distal zooecia; it is salient, wide, transverse, globular, smooth, surrounded by 
very small areolae, identical with the frontal. The two avicularia are large, tri- 
angular, with pivot, transverse, symmetrically placed. The aneestrula is small. 
Measurements. — External aperture lpi= 0.15 mm. 
. \Iz= 0.55-0.60 mm. 
Zooecia| fe=0 5Q _ 0 6Q mm> 
Affinities. — The analogy of the ovicellarian walls with the frontal is easy to 
observe on this species (fig. 6) ; the pleurocyst is more or less thick. The ances- 
trula is a small ordinary zooecium. 
In its form and general aspect this species is close to Peristomella alifera Keuss, 
1869, from the Vicentin. It differs from it in its incrusting and non-bilamellar 
zoarium and in its wide zooecia. 
It differs from Peristomella coccinea Abildgaard, 1S05, in its transverse ovicell, 
the entire absence of a false peristomie, its much wider zooecia (lz=0. 50-0.60 mm. 
and not 0.30 mm.), and the presence of six spines (and not four). 
It differs from Peristomella erecta. and P. fulgurans Manzoni, 1870; in its 
avicularia disposed transversely and not longitudinally. 
Occurrence. — Lower Jacksonian (Moodys marl) : Jackson, Mississippi (rare). 
Middle Jacksonian: Wilmington, North Carolina (very common); near Lenuds 
Ferry, South Carolina (rare) ; 18 miles west of Wrightsville, Johnson County, 
Georgia (very rare) ; 34 miles north of Grovania. Georgia (very rare). 
Upper Jacksonian (Ocala limestone) : West bank of Sepulga River, Escambia 
County, Alabama (common). 
Cotypes.— Cat. No. 64107, U.S.N.M. 
PERISTOMELLA ERECTA, new species. 
Plate S7, figs. 16, 17. 
Description. — The zoarium incrusts shells. The zooecia are distinct, elongated, 
elliptical; the frontal is convex, smooth, bordered by areolae and covered by a thick 
