M easurements.- 



AiiT.22. CYCLOSTOMATOUS BRYOZOA CANU AND BASSLEE. 11 



ordinary peristome, and opening in a different direction from that 

 of the tubes. 



Diameter of peristome 0. 16 mm. 



Diameter of orifice . 14 mm. 



Diameter of tubes .24 mm. 



Distance of tubes .64-0.80mm. 



Separation of tubes . 56-0. 64 mm. 



Length of ovicell 3.30mm. 



Width of ovicell 1.60 mm. 



In our North American Early Tertiary Bryozoa the figure ^ of 

 this species was inadvertently labeled Macroecia lamellosa Michelin, 

 1845. 



Occurrence.— J wY&ssm (Bathonian) : Ranville, Luc sur Mer, etc. 

 (Calvados), France. 



Family MECYNOECIIDAE Canu, 1918. 



1918. Mecynoeciidac Canu, Les ovicelles des bryozoaires cyclostomes, Bul- 

 letin Societe geologique de France, ser. 4, vol. 16, p. 326.— 1920. Canu 

 and Bassler, North American Early Tertiary Bryozoa, Bull. 106. 

 U. S. National Museum, p. 722. 



The ovicell is developed parallel to the tubes. It is formed be- 

 fore them and disarranges their respective positions. The oecios- 

 tome is anterior and nonterminal. 



The genera now referred to this family are Mecynoecia Canu, 1918, 

 Trigonoecia^ new genus, Gardioecia, new genus, Nematifera^ new 

 genus, Microecia Canu, 1918, Exochoecia Canu and Bassler, 1920, 

 Brachysoecia^ new genus, and Bisidmonea D'Orbigny, 1852. 



Genus MECYNOECIA Canu, 1918. 



1918. Mecynoecia Canu, Les ovicelles des bryozoaires cyclostomes, Bulletin 

 Society Geologique de France, ser. 4, vol. 16, p. 326. — 1920. Canu 

 and Basslee, North American Early Tertiary Bryozoa. Bull. 106, 

 U. S. National Museum, p. 722. 



The ovicell developed parallel to the tubes, is symmetrical and 

 with indefinite outlines. The oeciostome is elliptical, transverse, 

 turned toward the base, generally supported by a tube. 



Genotype.— Mecynoecia {Entalophora) delicatula Busk, 1875. 



The wide-spread and abundant species Entalophora prohoscidea 

 Milne-Edwards, 1836, was cited as the type of the genus by Canu 

 in 1918, but we have changed the genotype for the reason that sev- 

 eral species with different kinds of ovicells are undoubtedly included 

 under this name and it is perhaps impossible at present to determine 

 which one Milne-Edwards described. 



' Bull. 106, U. S. National Museum, p. 689, fig. 227 H. and p. 723, fig. 235 E. 



