NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
695 
Occurrence— Middle Jacksonian: Wilmington, North Carolina (very com- 
mon; near Lenuds Ferry, South Carolina (common); Eutaw Springs South 
Carolina ( common ) . 
Vicksburgian (Marianna limestone) : Salt Mountain, 5 miles south of Jackson, 
Alabama (very rare). 
Cotypes. — Cat. No. 65327, TJ.S.N.M. 
FILISPARSA BIN1, new species. 
Plate 159, figs. 1-7 
Description . — The zoarium is formed of filiform, sinuous, dichotomous, very 
little compressed branches, whose dorsal is very finely striated transversally. The 
tubes are distinct, convex, much elongated, arranged alternately in pairs on each 
side of the longitudinal axis, terminated by a narrowed peristomie, bent upward 
and salient ; the peristome is thin and orbicular. 
M easuremen ts .- — 
\ 
Diameter of the peristome 0.12 mm. 
Distance between the peristomes 1.20-1.60 mm. 
Diameter of the tubes. 0.18-0.20 mm. 
Width of the branches 0.38 mm. 
Affinities.--- The tubes which form each pair have their peristomes close together 
but not adjoining; they do not therefore form lines as in Idmonea bialternata 
Gregory, 1893. The present species differs from Filisparsa fallax not only in this 
very important character, but also in its smaller peristomial diameter (0.12 and 
not 0.16 mm.). 
Occurrence . — Vicksburgian (Red Bluff clay) : Seven and one-half miles south- 
west of Bladen Springs, Alabama (rare). 
Vicksburgian (Marianna limestone) : One mile north Monroeville, Alabama 
(rare). 
Cotypes. — Cat. Nos. 65406, 65407, U.S.N.M. 
FILISPARSA GRACILIS, new species. 
Plate 159, figs. 8-11. 
D escription . — The zoarium is formed of slender , rectilinear branches bifurcated 
at a very acute angle, compressed, formed of three longitudinal rows of tubes. 
The tubes are distinct, cylindrical, hardly curved at their extremity, finely striated 
transversally and irregularly placed; the peristome is thin, orbicular or elliptical. 
( Diameter of the peristome 0.16 (O.lf— 0.18 mm.). 
Measurements . — 1 Distance between the peristomes 0.60-0.80 mm. 
I Width of the branches 0.40 mm. 
Affinities . — This species differs from Filisparsa bini in its rectilinear, not 
sinuous, branches and in its shorter peristomial distance (0.80 and not 1.20 mm.). 
In the number of* longitudinal rows, its affinities are chiefly with Filisparsa fallax • 
