NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
693 
Forma FILISPARSA D’Orbigny, 1853. 
1853. Filisparsa D’Orbigny, Description des animaux invertebres Terrain Cretace Paleon- 
tologie l'ran raise, vol. 5, p. 814. 
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. — Peristomoecia, new genus. 
A. Ovicelled zoarium natural size and enlarged of Peristomoecia ( Proboscina ) boryii Savigny 
Audouin, 1826. Recent. 
B. Ovicelled zoarium of Peristomoecia ( Proboscina ) tamourouxi Savigny-Audouin, 1S26. 
Recent. 
C-E. Peristomoecia ( Stomatopora ) divergens Waters, 1904. C. Ovicelled zoarium ( ov , ovi- 
cell), X 10. D. View, X 25, showing ovic-ell 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 ovieells 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 ovieells 
much resemble those of Oncousoecia and for that reason we placed the zoarial form 
Filisparsa 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. 
