AM. 22. CYCLOSTOMATOUS BKYOZOA CANU AND BASSLER. 5 



Family CORYMBOPORIDAE Smitt, 1866. 

 Corymhopora Michelin, 1845; Fungella Hagenow, 1851. 



Subdivision Parallelata Waters, 1887. 



The subdivision Parallelata, in which the axis of the ovicell paral- 

 lels the zooecial axis, includes the majority of families of the Cyclo- 

 stomata in which ovicells have been discovered and represents the 

 most typical development of the order. The Eectangulata, on the 

 other hand, where the ovicell axis is at right angles to the zooecial 

 axis, embraces the " heteroporoid " genera, placed at one time in the 

 Paleozoic order Trepostomata, but now Imown to be Cyclostomata, 

 particularly on account of their ovicell structure. 



Family ONCOUSOECIIDAE Canu, 1918. 



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

 letin Society Geologique de France, ser. 4, vol. 16, p. 325. — 1920. Canu 

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

 National Museum, p. 687. 



The axis of the ovicell is parallel to that of the tubes. The ovicell 

 is developed at the same time as the adjacent tubes, which are not 

 disarranged in their respective positions. 



The known genera of this family are Oncousoecia, Canu, 1918, in 

 which the ovicell is a dilation of the entire exterior part of the tube, 

 and Peristomoecia Canu and Bassler, 1920, where the peristomie 

 alone forms the ovicell. 



Genus ONCOUSOECIA Canu, 1918. 



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

 letin Soci^te Geologique de France, ser. 4, vol. 16, p. 325. — 1920. Canu 

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

 National Museum, p. 687. 



The ovicell is a dilation of the entire exterior visible part of the 

 tube. The oeciostome is not turned toward the base. Fourteen ten- 

 tacles. 



Genotype. — Tuhulipora lohulata Hincks, 1880. 



Range. — Cretaceous (Maastrichtian) — Recent. 



The type of this genus is an incrusting form, but included in the 

 genus is a number of species with the erect ramose manner of growth 

 hitherto referred in part to Filisparsa and Entalophora. The geno- 

 type of Filisparsa D'Orbigny, 1852, F. neocomien^is D'Orbigny, 1852, 

 shows no ovicell, but other species with the same zoarial growth 

 exhibit several distinct types of ovicell. The position of Filisparsa 

 in a natural classitication, therefore, can not at present be determined. 



