NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
607 
This fossil species bears the largest oral avicularium (0.18 by 0.15 mm). 
Occurrence . — Middle Jacksonian: Wilmington, North Carolina (common); 
Rich Hill, Crawford County, Georgia (very common). 
Cotypes. — Cat. Nos. 64214, 64215, TJ.S.N.M. 
HOLOPORELLA GRANULOSA, new species. 
Plate 16, figs. 1-9. 
D escription .- — The zoarium is massive and formed of small globular masses 
fixed to bryozoa or to shells, which it surrounds completely. The superficial 
zooecia are little erect, oblique, large, elliptical; the frontal is convex, surrounded 
by widely spaced areolae and formed of a granular pleurocvst placed on the olocyst. 
The apertura is large, semilunar, with a concave, proximal border; the peristome 
bears laterally one to two lateral avicularia. The ovicell is hyperstomial, recum- 
bent, transverse, small, somewhat salient, granular, widely open above the apertura. 
The deep zooecia have a normal apertura and a very salient, peristomial avicularium. 
The incomplete zooecia are rare. The interzooecial avicularia are rather large, 
oval, little salient, without pivot. 
M easurements . — Apert u ra 
7m=0. 15 mm. 
la— 0.17 mm. 
Variations .— The zooecia in contact with the substratum (fig. 5) are oriented; 
on the lower face of the zoarium the zooecia are visible, irregular ; their walls have 
two or three calcareous layers. The granular pleurocvst is detachable from the sub- 
jacent olocyst (fig. 8) and the two calcareous formations are often visible. In the 
interior (fig. 6) the apertura is oblique and without cardelles. The ovicell is of 
the same nature as the frontal (fig. 4). The interzooecial avicularia (figs. 3, 7) 
are quite remarkable in the absence of pivot. 
A-fflnities . — By its zooecial aspect this species much resembles Holoporella 
descostilsii Savigny-Auclouin, 1826, of recent seas. It differs simply in the presence 
of peristomial avicularia. 
Occurrence . — Claibornian (Gosport sand) : Claiborne, Alabama (rare) ; Gopher 
Hill, Tombigbee River, Alabama (rare) ; 1 mile southwest of Rockville, Clarke 
County, Alabama (very common). 
Claibornian (Cook Mountain formation) : Moseleys Ferry, Caldwell County, 
Texas (rare). 
Claibornian (Lisbon formation) : Wautubbee Hill, Clarke County, Mississippi 
(very common). 
Lower Jacksonian (Moodys marl) : Jackson, Mississippi (common). 
Cotypes.- — Cat. No. 63858, U.S.N.M. 
HOLOPORELLA CRASSICOLLIS, new species. 
Plate 76, figs. 11, 12. 
JO escription . — The zoarium is unilamellar and incrusts shells. The zooecia are 
little erect, almost always oriented ; the frontal is smooth and convex. The apertura 
