NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
591 
small pores. The apertura is semilunar; it bears on its straight proximal border 
a small linear rimule; the peristome is much developed into two large lateral lips 
circumscribing a sort of incomplete and very large spiramen. The ovicell is hyper- 
stomial and recumbent; it forms a sort of small, punctured sack placed on the 
bottom of the zooecium. A small vibraculoid avicularium is developed laterally 
near the aperture. 
Measurements . — Apertura 
(A«:=0.08 mm. 
I la— 0.10 mm. 
Zooecia 
f Zs=0. 60-0.70 mm. 
I lz— 0.30-0.40 mm. 
Variations. — The peristome is quite variable. The tremopores are often 
obliterated by fossilization. The ovicell is truly recumbent or partially supported 
on the distal zooecium (fig. 8). To accommodate so great a peristomial complexity 
it is probable that the tentacles were very long and fine. 
Occurrence. — Middle Jacksonian: Wilmington, North Carolina (rare); one- 
half mile southeast of Georgia Kaolin Co. mine, Twiggs County, Georgia; 18 
miles west of Wrightsville, Georgia. 
Cotypes. — Cat. No. 62611, U.S.N.M. 
Genus LAGENIPORA Hincks, 1877. 
1877. Lagenipora Hincks, On British Polyzoa, Annals Magazine Natural History, ser. 4, 
vol. 20, p. 215. 
“ Colonies consisting of a number of cells immersed in a common calcareous 
crust. Zooecia recumbent, contiguous, lageniform; oral extremity free, tubular, 
with a terminal orbicular orifice.” (Hincks.) 
Genotype. — Lagenipora socialis Hincks, 1877. 
Range . — Jacksonian — Kecent. 
Waters and Jullien did not admit that a long, free, peristomie could charac- 
terize a genus. 
The first of these authors has preserved Hincks’s name for all the species more 
or less erect and provided with a cribriform area on the ovicell. Levinsen, in 
1909, called Siniopelta the group of the species of Waters in which the growth 
is that of the Cellepores. 
We have not the data for a discussion, and we preserve Hincks’s genus in his 
exact meaning. It is indisputable that the genotype is one of the Phylactellidae on 
account of the nature of its ovicell, and that the specimens discovered in our 
Eocene are well classified in this family. 
LAGENIPORA AMERICANA, new species. 
Plate 74, figs. 9. 
Description . — The zoarium incrusts shells. The zooecia are distinct, long, 
lageniform, composed of two parts; the frontal is convex and garnished with 
tremopores; the peristomiale is very long, oblique, smooth, terminated by an ex- 
panded peristome. Ovicell unknown. 
