722 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
This species is well characterized by its small peristomial diameter and its 
very little convex ovicell. Desmeplagioecia brevis and Desmeplagioecia tenuis 
Reuss, 1869, have a larger zooecial diameter (0.12 mm.). 
O ccurrence. — Upper Jacksonian (Ocala limestone) : Chipola River, east of 
Marianna, Jackson County, Florida (rare) ; Red Bluff on Flint River, 7 miles above 
Bainbridge, Georgia (very rare) ; Old Factory, about 1}- miles above Bainbridge, 
Georgia (rare). 
Cotypes. — Cat. Nos. 65318, 65319, U.S.N.M. 
Family MACROECIIDAE Canu, 1918. 
1918. Mdcroeciadae Canu, Les ovicelles des bryozoaires cyclostomes, Bulletin Societe 
Geologique de France, ser. 4, vol. 16, p. 328. 
The longitudinal axis of the ovicell is parallel to the axis of the tubes. The 
ovicell is formed before the calcification of the neighboring tubes whose order and 
arrangement are disarranged. The oeciostome is immense and terminal. 
This family is characterized by the size of its larva established by that of the 
oeciostome. No American species have so far been discovered. 
Genus MACROECIA Canu, 1918. 
1918. Macroecia Canu, Les ovicelles des bryozoaires cyclostomes, Bulletin Societe Geo- 
logique de France, ser. 4, vol. 16, p. 328. 
The ovicell is elongate, elliptical, very salient. The oeciostome is not turned 
toward the bottom. 
Genotype. — Macroecia ( Diastopora ) lamellosa Michelin, 1845. Jurassic. 
Family MECYNOECIIDAE Canu, 1918. 
Anatomical bibliography.- — 1914, Waters, Bryozoa from Zanzibar, Proceedings of tlie Zoological 
Society of London, p. 840, pi. 2, figs. 1-49. — 1918. Canu, Les ovicelles des bryozoaires ey- 
clostomes, Bulletin de la Societe Geologique de France, ser. 4, vol. 16, p. 326. 
The ovicell is developed parallel to the tubes. It is formed before them and 
disarranges their respective position. The oeciostome is anterior and nonterminal. 
The principal genera of this family are: Mecynoecia Canu, 1918, Microecia 
Canu, 1918, and Exochoecia , new genus. 
Genus MECYNOECIA Canu, 1918. 
1918. Mecynoecia Canu, Les ovicelles des bryozoaires cyclostomes, Bulletin de la Society 
Geologique de France, ser. 4, vol. 16, p. 326. 
The ovicell is symmetrical with indefinite contours. The oeciostome is ellipti- 
cal, transverse, turned toward the base, generally supported by a tube. 
