6 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



and it is believed best to retain the name for species showing no ovi- 

 cell, but with the zoarial form of growth consisting of erect ribbon- 

 like branches with the zooecia opening on one face only. For con- 

 venience the zoarial form Filisparsa can be included in the Oncou- 

 soeciidae. 



ONCOUSOECIA BIFURCATA Ulrich and Bassler. 1907. 



Plate 1, fig. 1. 



1907. Filisparsa bifurcata Ulkich and Bassler, Geological Survey of New 

 Jersey, Cretaceous, Paleontology, vol. 4, p. 322, pi. 22, fig. S. 



Diameter of peristome 0. 26-0. 28 mm. 



Zooecial width .36-. 40 mm. 



Measurements. — ' Distance between orifices .90 mm. 



Separation of peristomes .90 mm. 



Dimensions of oeciostome . 34 by 0.18 mm. 



We have been fortunate in discovering the ovicell of this Filisparsa 

 and find that it is identical with that of Oncousoecia varians Eeuss, 

 1869, and with that of Oncousoecia quinqueseriata Canu and Bassler, 

 1920, but it is more distinct from the genotype Oncousoecia {Tubuli- 

 pora) loluluta Hincks, 1880. On the other hand, its oeciostome 

 which is transverse and wider than a peristome, is of a quite diver- 

 gent type and well characterizes the species. Exactly analogous 

 oeciostones occur in Macroecia^ but in this genus the ovicell is enor- 

 mous and causes the abortion of a number of neighboring tubes. 



Occurrence. — Cretaceous (Vincentown marl) : Vincentown, New 

 Jersey. 



C oty pes. —C?it. No. 52594, U.S.N.M. 



ONCOUSOECIA ACCUMULATA, new species. 



Plate 1, figs. 2-5. 



Description. — The zoariuni is formed of discoid subcolonies accu- 

 mtdated upon each other ; it is irregularly cylindrical and narrowed 

 laterally from place to place. The tubes are cylindrical ( ? ) , recurved 

 toward the periphery, restricted to each subcolony ; the peristome is 

 thin, salient, sharp. The ovicell is globular, elliptical, transverse, and 

 aborts the adjacent tubes; the oeciovStome is an ordinary peristome, 

 little salient and placed somewhat eccentrically. 



Structure. — The structure of this species is quite remarkable. Ex- 

 ternally it resembles somewhat Spiropora., but the windings of the 

 spire are in reality only the discoid subcolonies piled on top of each 

 other. Each of them appears to grow from the center of the in- 

 ferior subcolony. Nevertheless the calcification of the tubes may not 

 be produced very regularly, for often there are tubes which pass 



