NORTH AMERICAN EARLY TERTIARY BRYOZOA. 527 



pcristomio, 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.Q&l. No. 63851, U.S.N.M. 



CHEILOPORA PRELUCIDIOIDES, 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 apertnra 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. 



-,, |^fl=0.27 mm. . [7^=1.25 mm. 



Measurement*. Apertura , n ZooeciaL 



lto=0.30mm. \/3 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 Chciloporaprelucidia 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.C&t. 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 by 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. 



[fifl=0.15-0.17mm. . (7^=0.85 mm. 



Zooecia lZs=0.40-0.45 mm. 



