NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
237 
These micrometric measurements differentiate it clearly from M icropora nvinu- 
ticella which is exceptionally small. 
0 ccurrence . — Miclwayan (Clayton limestone) : One mile west of Fort Gaines, 
Georgia (very rare). 
Middle Jacksonian (Castle Hayne limestone) : Wilmington, North Carolina 
(rare). 
Upper Jacksonian (Ocala limestone) : 14 miles above Bainbridge, Georgia; 
4 miles below Bainbridge, Georgia; 7 miles above Bainbridge, Georgia; Chipola 
River, east of Marianna, Florida. 
Vicksburgian (Marianna limestone) : West bank of Conecuh River, Escambia 
County, Alabama (rare) ; deep well, Escambia County, Alabama; near Claiborne, 
Alabama (rare) ; Salt Mountain, 5 miles south of Jackson, Alabama (rare). 
Postpliocene: Santa Barbara, California (Gabb and Horn). 
Patagonian: Argentina (Canu). 
Geological distribution.- — Auversian of France (Canu) ; Priabonian of the 
Vicentin (Reuss, Waters), of Hungary (Pergens) ; Aquitanian of France (Canu) ; 
Burdigalian of France (collection Canu) ; Sicilian and Quaternary of Italy 
(Neviani). 
Habitat. — Atlantic: Off France, England, Azore Islands, Madeira and Florida 
(36-136 fathoms,). Mediterranean (80 meters). Antarctic (500 meters). Pacific: 
Off Queen Charlotte Island and California (45 fathoms). In the Antarctic the 
species lives at a temperature of 9° Centigrade. 
Plesio types. — Cat. Nos. 63803, 63804, U.S.N.M. 
MICROPORA MINUTICELLA, new species. 
Plate 4, fig. 23. 
Description. — The zoarium incrusts small shells. The zooecia are small , dis- 
tinct, separated by a furrow, elongated; the crvptocyst is shallow, very finely 
granulated; the mural rim is thin, distinct, nearly complete; the aperture is semi- 
lunar, transverse, surrounded by a peristome. The ovicell is smooth and endozooe- 
cial. A pair of very small lateral opesiules is present. 
,, , , , iAo=0.04 mm. „ . fZs=0.25-0.27 mm. 
Measurements . — Aperture A n Zooecium , . ... 
1 |7c»=0.07 mm. ( 7s =0.20 mm. 
Affinities. — This is the smallest of the known species of Micropora. Its anoes- 
trula, however, is not much smaller than the other zooecia. 
Occurrence. — Miclwayan (Clayton limestone) : One mile west of Fort Gaines, 
Georgia (very rare). 
Holotype. — Cat. No. 63805, U.S.N.M. 
Genus HQPLOCHEILINA Canu, 1911. 
1911. Hoplocheilina Canu, Iconographie des Bryozoaires fossiles de 1’ Argentine, pt. 2, Anales 
del Museo Nacional de Buenos Aires, vol. 21, p. 261. 
The polypidian convexity is little salient. The opesiules are round, indenta- 
tions of little depth. The opesium is ogival. The cryptocyst is little deep. The 
ovicell is endozooecial. There are two large, oral avicularia. 
