NORTH AMERICAN EARLY TERTTARY BRYOZOA. 
527 
peristomie, in its much larger and more numerous tremopores. and in its lateral 
avicularium. 
The figured specimen bears no ovicell and its generic determination remains 
therefore somewhat doubtful. 
Occurrence . — Claibornian (Gosport sand) : Bluff on Tombigbee River, Gopher 
Hill, Alabama (very rare). 
Holotype. — Cat. No. 63851, U.S.N.M. 
CHEILOPORA PRELUC1DIOIDES, new species. 
Plate 68, figs. 1, 2. 
Description . — The zoarium is free, formed of two lamellae, back to back, sep- 
arating with difficulty. The zooecia are distinct, somewhat elongated, regular, 
elliptical, separated by a thread; the frontal is convex; the tremopores are large 
and are placed at the bottom of small hexagonal cavities. The apertura is large, 
ogival, with a proximal border, rigorously straight; the proximal border of the 
peristomice is somewhat convex; the peristome is complete, but salient only in its 
lateral and distal parts. Frequently near the apertura there are two small, simple 
avicularia disposed symmetrically. 
Measurements . — Apertura 
\ha= 0.27 mm. 
[fa,=0.30 mm. 
„ . \Lz= 1.25 mm. 
Zooecia. 
pg=0.80mm. 
Variations . — In the interior the zooecia are lozenge-shaped, as is usual in this 
genus (fig. 2). They bear on their lateral walls two large, fusiform dietellae, 
as in the other species of Cheilopora with cardelles. We have not yet discovered 
the ovicell. 
Affinities . — This species much resembles the recent C heilopora, prelueidia Hincks, 
1883, living still in American waters; it differs from it only in its bilamellar 
zoarium and in its peristome, which is not salient in its proximal portion. 
It differs from the other fossil Cheilopora in the absence of cardelles. 
Occurrence . — Middle Jacksonian: Near Lenuds Ferry, South Carolina (rare). 
Holotype.— Cat. No. 64174, U.S.N.M. 
CHEILOPORA STRICTOCELLA, new species. 
Plate 68, fig. 12. 
Description . — The zoarium is free, plurilamellar, formed of lamellae, back to 
back, and inseparable. The zooecia are distinct, narrow, fusiform, separated later- 
ally bv a salient thread; the frontal is somewhat convex and perforated with large 
tremopores in quincunx. The apertura is elongate ; the anter is large and semi- 
elliptical; it is separated by two cardelles from a very small poster, of which the 
proximal border is convex; the peristome is incomplete, salient, and sharp. The 
avicularian zooecia have a very elongated orifice. 
Measurements . — Apertura 
ha=0. 15-0.17 mm. 
la = 0.20-0.24 mm . 
Zooecia 
\Lz= 0.85 mm. 
1^=0.40-0.45 mm. 
