NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
729 
the peristomie depends upon how well the fossils are preserved. The quincunx 
arrangement of the peristomes is not very regular and we figure a specimen where 
they are arranged in transversal rows. 
Affinities. — This species differs from M ecynoecia compressa in its much shorter 
ovicell, its zoarium less lamellar, and its shorter distance between the peristomes. 
It differs from Entaiophora subcompressa Reuss, 1866, of which it is the American 
representative, in the length of its peristomie. 
Occurrence. — Middle Jacksonian: Eighteen miles west of Wrightsville, 
Georgia (very rare) ; Eutaw Springs, South Carolina (very rare) ; Georgia Kaolin 
Company’s mine, Twiggs County, Georgia (very rare) ; Rich Hill, five and one- 
fourth miles south of Knoxville, Crawford County, Georgia (rare). 
Jacksonian (Zeuglodon zone) ; Shubuta, Mississippi (very rare) south side 
of Suck Creek, Clarke County, Mississippi (very rare). 
Cotypes. — Cat. Nos. 65166-65469 U.S.N.M. 
MECYNOECIA MAGNICELLA, new species. 
Plate 128, figs. 1, 2. 
Desci'iption .- — The zoarium is an Entalophora with cylindrical branches. The 
tubes are cylindrical, distinct, disposed in irregular quincunx, striated transver- 
sally, very large; bent upward at their extremity and terminated by an oblique, 
little salient peristomie; the peristome is thick, orbicular, oblique. 
Diameter of the peristome 0.24 mm. 
Diameter of the apertura 0.18 mm. 
Diameter of the zooecia 0.30-0.36 mm. 
Measurements. — Distance between the peristomes 1.40 mm. 
Separation of the peristomes 1.40 mm. 
Maximum length of the peristomie 0.30 mm. 
. Diameter of the zoarium 1.25 mm. 
This species is the largest of the American fossils described in the present 
memoir. Its determination is therefore very easy. The ovicell is unknown. Only 
the figured specimen has been collected. 
O ccurrence. — Tipper Jacksonian (Ocala limestone) : Alachua, Florida (very 
rare) . 
MECYNOECIA COMPRESSA, new species. 
Plate 155, figs. 1S-22. 
Description. — The zoarium is formed of lamellar, cylindrical or slightly com- 
pressed, fronds. The tubes are distinct, convex, striated transversally ; the peri- 
stomes are little salient, thin, orbicular or elliptical, arranged in very irregular 
quincunx. The ovicell is elliptical, very elongate, subsymmetrical ; the oeeiostome 
is transverse and placed on the peristomie of a tube, 
f Diameter of the peristome 0.16 mm. 
Measurements . — j Distance between the peristomes 0.60 mm. 
[ Separation of the peristomes 0.52 nun. 
