NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
197 
NELLIA BIFACIATA, new species. 
Plate 32, figs. 15-19. 
Description. — The segments are formed of four linear series, with five zooeeia 
in each. The zooeeia are distinct, constricted below, and provided with a much- 
developed gymnocyst bearing two small avicularia. The mural rim is thin, salient, 
and without cryptocyst. The opesium is somewhat oval, narrowest below; the 
two frontal avicularia are symmetrical, simple, and without pivot. 
. n • 0.26 mm. 
Measurements. — OvesiaK. „ „ n 
r £<9=0.08-0.10 mm. 
Zooeeia 
\Lz= 0.50 mm. 
\lz=0. 16-0.20 mm. 
Affinities. — The four faces of the zoarium are not identical. There are two 
rows of broad zooeeia and two narrower ones. This character primarily, in addi- 
tion to the great development of the gymnocyst, clearly distinguishes this species 
from NelUa oculata Busk, 1852. The micrometric measurements are also smaller. 
The specimens from the Jacksonian are a little smaller than those of the 
Vicksburgian, but all the other characters are absolutely similar. 
The first of the lower zooeeia of the segment is often radicular; the second is 
frequently regenerated. In figs. 15, 16 may be seen an ordinary zooecium trans- 
formed into a radicular zooecium ; probably it contained no polypide. We have not 
had the opportunity to discover the ovicells. 
Occurrence. — Lower Jacksonian (Moodys marl) : Jackson, Mississippi (very 
rare) . 
Middle Jacksonian (Castle Havne limestone) : Wilmington, North Carolina 
(rare). 
Vicksburgian (Glendon member of Marianna limestone) : "West bank of Cone- 
cuh Biver, 1 mile below mouth of Sepulga Biver, Conecuh County, Alabama (rare). 
Vicksburgian (Byram marl) : Byram, Mississippi (rare). 
Cotypes.— Cat. Nos. 63954, 63955, U.S.N.M. 
NELLIA CONCATENATA Canu, 1907. 
Plate 32, figs. 20, 21. 
1907. Farcimia concatenata Canu, Bryozoaires des terrains tertiaires des environs de Paris, 
Annales de Paleontologie, vol. 2, p. 19, pi. 11, figs. 1-4. 
Of this species we have found only the two figured fragments which have been 
compared directly with specimens from the vicinity of Paris, with the result that 
their identity can not be doubted. 
The large dimensions of Nellia concatenata clearly distinguishes it from the 
two preceding, Nellia oculata Busk and A 7 , bifaciata. 
Occurrence. — Middle Jacksonian: One-half mile southeast of the Georgia 
Kaolin Company’s mine, Twiggs County, Georgia (very rare). 
Plesiotypes. — Cat. No. 63956, U.S.N.M. 
NELLIA MIDWAYANICA, new species. 
Plate 4, figs. 10-15. 
Description. — The zoarium is articulated and radicellate. Each segment is 
quadrangular and formed of straight zooeeia arranged in four series equal, two by 
