NORTH AMERICAN EARLY TERTIARY BRYOZOA. 

 Forma FILISPARSA D'Orbigny, 1853. 



1853. FiHsparsa D'ORBIGNY, Description des animaux inverte'bre's Terrain Cre'tace' Paleon- 

 tologie fraugaise, vol. 5, ]i. S14. 



The zoarium consists of linear, ribbonlike branches, which are erect. The 

 branches dichotomize and may anastomose. The base is expanded. Zooecia open 

 in one face only. The apertures are irregularly distributed. (After Gregory, 

 1899.) 



FIG. 228. Peristomoeeia, new genus. 



A. Ovicelled zoarium natural size and enlarged of Peristomoeeia (Proboscina) boryii Savigny 

 Audouin, 1826. Recent. 



B. Ovicelled zoarium of Peristomoeeia (Proboscina) lamourouxi Savigny- Audouin, 1826. 

 Recent. 



C-E. Peristomoeeia (Stomatopora) diveraens Waters, 1904. C. Ovicelled zoarium (ov, ovi- 

 cell), X 10. D. View, X 25, showing ovicell developed all around the free peristomie. E. Pro- 

 toecium, X 85. Recent. 



Genotype. Filisparsa neocomiensis D'Orbigny. 1853. 



Zoarial forms of the type described as Filisparsa occur in several distinct fam- 

 ilies, but unfortunately ovicells on species with this method of growth are still 

 rare. When the ovicell appears on the noncellular posterior face the species be- 

 longs to Tervia Jullien, 1883, but if on the anterior face it occurs as an elongated 

 median sack formed by the dilation of the terminal part of a tube. Species of the 

 latter type form the genus Oncousoecia Canu, 1918. The species without ovicells 

 much resemble those of Oncousoecia and for that reason we placed the zoarial form 

 I-'/li'sparsa in the Oncousoeciidae. 



FILISPARSA FALLAX, new species. 



Plate 142, figs. 1-11. 



Description. The zoarium is filiform, slightly compressed, formed of two to 

 three longitudinal rows of tubes. The tubes are little visible, convex, very finely 

 striated transversally, cylindrical. The peristome is thin, orbicular or elliptical. 



