NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
227 
Occurrence ,. — Midwayan (Clayton limestone) : Mabelvale, near Little Rock, 
Arkansas (common) ; 1 mile west of Fort Gaines, Georgia (rare) ; 2J miles north- 
east of Ripley, Mississippi (rare) ; Lnverne, Crenshaw County, Alabama (rare). 
Cotypes. — Cat. No. 63802, U.S.N.M. 
E. Aechmella F. JVlicropora G. Hoplocheilina H. Vibracella 1. Lunularia 
Fig. 61. — Genera of subfamilies Mieroporidae Hindis, 1880, and Lunulariidae Levinsen, 1909. 
B. Rosseliana 
C. Dacryonella 
D. Gargantua 
A. Floridinella vicksburgica Canu and Bassler, 1917, X 20. Vicksburgian, one mile 
north of Monroeville, Alabama. 
B. Rosseliana parvipora, new species, X 20. Vicksburgian, one mile north of Monroeville, 
Alabama. 
C. Dacryonella octonaria Canu and Bassler, 1917, X 20. Middle Jacksonian, Wilmington, 
North Carolina. 
D. Gargantua bidens Busk, 1859. Crag of England. 
E. Aechmella filimargo Canu and Bassler, 1917, X 20. Upper Jacksonian, Escambia County, 
Alabama. 
F. Micropora coriacea Esper, 1791, X 20. Middle Jacksonian, Wilmington, North Carolina. 
G. Hoplocheilina spectabilis Canu, 1911. Rocanean of Argentina. 
H. Vibracella trapezoidea Reuss, 1864. Priabonian of the Vicentin. 
I. Lunularia distans Lonsdale, 1845, X 20. Middle Jacksonian, Wilmington, North Carolina. 
Subfamily Microporidae Hincks, 1880. 
Bibliography ( Anatomical ). — 1886, Jullien, Mission scientifique du Cap Horn, Bryozoaires, 
vol. 6, pi. 14. — 1900. Calvet, Contribution a 1’histoire naturelle des Bryozoaires ectoproctes 
marins, Travaux de l’lnstitut de Zoologie de l’Universite de Montpellier, Mem. No. 8, pi. 8, 
figs. 11, 12.— 1902. Harmer, On the Morphology of the Cheilostomata, Quarterly Journal 
Microscopical Science, vol. 46, p. 316, pi. 17, fig. 51; pi. 18, figs. 57. 5S. — 1909. Levinsen, Mor- 
phological and Systematic Studies on the Cheilostomatous Bryozoa, p. 161, pi. 8, fig. 3. 
The ovicell is endozooecial. The parietal muscles, attached to the ectocvst, 
pass through the calcareous cryptocyst, either by the opesiular indentations or 
