NORTH AMERICAN EARLY TERTIARY BRYOZOA. 575 
PHYLACTELLA PARVICELEA, new species. 
Plate 71, fig. 27. 
Description. — The zoarium incrusts bryozoa. The zooecia are relatively small. 
short, distinct, elliptical; the frontal is convex and formed of a tremocyst with very 
small pores separated by very minute granules. The apertura is elliptical; the 
peristome is thin, salient, complete. 
,, , . [A«=0.10mm. „ . [7is=0.40 mm. 
Measurements. — Apertura \ , „ . „ Zooecia 7 n OA 
1 lZu=0.10mm. u?.— 0.30 mm. 
Affinities.— This is the smallest of our Phylactella; it is therefore easy to de- 
termine. Unhappily, only the figured specimen has been found-, so we are ignorant 
of the ovicell. 
Occurrence. — Middle Jacksonian: Baldock, Barnwell County, South Carolina 
(very rare). 
Holotype. — Cat. No. 64191, U.S.N.M. 
PHYLACTELLA CRIBRATA, new species. 
Plate 96, fig. 10. 
Description. — The zoarium incrusts bryozoa. The zooecia are elongated, dis- 
tinct, ovoid; the frontal is convex and formed of a tremocyst with numerous pores 
in quincunx. The apertura is suborbicular, oblique, little visible exteriorly; the 
peristome is thin, complete, salient, bearing on its proximal border a wide salient 
rnucro, placed facing the orifice of the ovicell. The ovicell is small, transverse, 
smooth; it is hyperstomial and recumbent. A triangular avicularium somewhat 
salient, the point directed toward the top, is placed laterally on a single extremity 
of the transversal axis of the zooecia. 
M easurements . — Apertura • 
\ha— 0.16 mm. 
Ua— 0.18 mm. 
Zooecia 
f 7^3=0.65-0.75 mm. 
1/3=0.40-0.45 mm. 
Affinities . — This species is very well characterized by its sieve-like frontal of 
tremopores, larger than ordinary, and by its lateral avicularium. 
It is to be noted that most of the known Phylactella have an aperture whose 
diameter is close to 0.15-0.17 mm. The genus is a perfectly natural one. 
Phylactella (. Lepralia ) tubiceps Reuss, 1865, of the German Rupelian, is quite 
close on account of the size of its tremopores and in the presence of an avicularium ; 
it differs from it solely in the absence of a peristomie, an exterior which has given 
the name to the European species. 
Upon examination of more numerous specimens it may be that the two species 
will be recognized as identical. 
Occurrence . — Vicksburgian (“Chimney rock” of Marianna limestone) : One mile 
north of Monroeville, Alabama (rare). 
Holotype. — Cat. No. 64310, U.S.N.M. 
