722 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



This species is well characterized by its small peristomial diameter and its 

 very little convex ovicell. Desmcplagioecia brevis and Desmeplagioecia, tennis 

 Beuss, 1869, have a larger zooecial diameter (0.12 mm.). 



Occurrence. 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). 



Cotypcs.CvA,. Nos. 65318, 65319, U.S.N.M. 



Family MACROECIIDAE Canu, 1918. 



1918. Macroeciadae CANU, L/es 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, 1913. 







1918. Macroccia 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) lamellosn Michelin, 1845. Jurassic. 



Family MECYNOECIIDAE Canu, 1918. 



Anatomical bibliography. 1914, WATERS, Bryozoa from Zanzibar, Proceedings of the Zoological 

 Society of London, p. 840, pi. 2, figs. 1-49. 1918. CANU, Les ovicelles des bryozoaires cy- 

 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 Societe 1 

 Geologique cle 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. 



