NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
415 
The texture of the frontal of the ovicell is identical, but the areolae are much 
smaller. In front of the ovicell 2 or 4 spines often persist. The direction of the 
avicularia is not very constant; they are sometimes somewhat oblique. 
Affinities.— This is the American representative of Peristomella fulgurans 
Manzoni, 1870, of the Italian Pliocene. Our species differs from it in a lesser 
convexity of the frontal and in the avicularia, which are straight (and not some- 
what arched) and which never touch the peristome. 
This species differs from Peristomella laciniata Seguenza, 1879, in the absence 
of a false peristomie and in the elliptical, elongated form of its external aperture. 
It differs from Peristomella laticella and P. coccinea Abildgaard, 1805, in its 
avicularia placed longitudinally (and not transversally) . 
Occurrence. — Vicksburgian (Marianna limestone) : Near Claiborne, Monroe 
County, Alabama. 
Cotypes. — Cat. No. 64284, U.S.N.M. 
PERISTOMELLA FALCIFERA, new species. 
Plate 54, figs. 8—10. 
Description. — The zoarium incrusts shells. The zooecia are large, elliptical, 
erect; the frontal is very convex, smooth, surrounded by a double line of very 
small areolae, quite crowded; it is terminated distally by a salient mucro, bifid, 
oblique. The peristome is quite prominent, thick, garnished with six spines; the 
locella is very large; the apertura (in the interior) is suborbicular, oblique, entirely 
hidden by the mucro. The ovicell is very large, globular, quite salient, smooth; 
it is hyperstomial, placed on the distal zooecium; it opens into the locella by a 
large orifice, facing the mucro. On each side of the apertura there are two long 
falciform avicularia, parallel to the zooecial axis, the beak above. 
Measurements. — Zooecia mm ‘ 
[13=0.60 mm. 
Affinities. — In the disposition of the avicularia, this species is near to 
P eristomella fulgurans , but differs in the form of the straightened avicularia and 
its larger micrometric dimensions. 
It differs from Lepralia complicata Reuss, 1847, in its much larger bifid mucro 
hiding the apertura. 
The convexity of the zooecia gives to the interior of the zooecia a very peculiar 
geometric aspect; the locella appears as a simple slit between the zooecia and the 
ovicell (fig. 10). 
Occurence. — Middle Jacksonian (Castle Haylie limestone) : Wilmington, 
North Carolina (very common). 
Cotypes. — Cat. No. 64108, U.S.N.M. 
Genus EXOCHELLA Jullien, 1888. 
1888. ExocheJla Jtjllien, Mission scientifique du Cap Horn, vol. 6, Zoologie Bryozoaires, 
p. 55. 
The aperture is oblique without lyrula, cardelles or rimule. The ovicell is 
hyperstomial and imbedded in the distal zooecia. It opens above the aperture and 
