NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
745 
V aviations. — The zoarial variations are in rapport with the substratum. On 
the shells, the branches are always longer and the zoaria more complete; on the 
algae the branches are broken and detached from one another in fossilization. 
The aspect of the ovicell varies with the width of the branches and the number 
of the tubes surrounded. 
Occurrence. — Yicksburgian (Marianna limestone) : Salt Mountain, 5 miles 
south of Jackson, Alabama (very common) ; near Claiborne, Monroe County, 
Alabama (rare) ; Murder Creek, east of Castlebury, Conecuh County, Alabama, 
(rare) ; west bank Conecuh River, Escambia County, Alabama (rare). 
Vicksburgian (Red Bluff clay) : One-fourth of a mile west of Woodwards, 
Wayne County, Mississippi (rare). 
Cotypes. — Cat. Nos. 65383, 65384, U.S.N.M. 
DIAPEROECIA WALCOTTI, new species. 
Plate 154, figs. 10, 11. 
Description. — The zoarium has the form of a multiserial Proboscina; it 
incrusts orbitoid foraminifera in clavate branches. The tubes are distinct, cylin- 
drical, very irregularly arranged, slightly striated, terminated by a peristomie 
little salient and bent upward: the peristome is thin, orbicular, horizontal. The 
ovicell is little salient; the oeciostome is adjacent to a normal tube. 
Measurement. — Diameter of the peristome 0.10-0.12 mm. 
We dedicate this species to Dr. Charles D. Walcott. Secretary of the Smith- 
sonian Institution. 
Occurence.—- Vicksburgian (Marianna limestone) : West bank, Conecuh 
River, Escambia County, Alabama (rare). 
Rolotype. — Cat. No. 65385, U.S.N.M. 
. Genus DIPLOSOLEN Canu, 1918. 
1918. Diplosolen Canu, Les ovicelles des bryozoaires oyclostomes. Bulletin Soeiete Geologi- 
que de France, ser. 4, vol. 16, p. 329. (Proposed for Diplopora Juixien, 1886, pre- 
occupied. ) 
Adventitious tubules are present. The oeciostome is isolated. 12 tentacles. 
Genotype. — Diplosolen ( Rerenicea ) obelium Johnston, 1847. 
Range. — Senonian-Recent. 
According to Waters the tubules are developed at the same time that a second 
calcareous layer is superposed on the normal skeleton. 
The previously described species belonging to this genus are : 
Berenicea obelia Johnston, 1838. Helvetian-Recent. 
Reticulipora intricata Smitt, 1867. Recent. 
Reticulipora. transcennata Waters, 1884. Priabonian. 
Diastopora compacta Canu, 1909. Lutetian. 
Diastopora lineata Gabb and Horn, 1865. Cretaceous (Vincentown). 
Diastopora obelioides Pergens, 1889. Coniacian. 
The term “ Diplopora ” of Jullien has been preoccupied two or three times. 
