BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



The tubes are invisible and hidden by the zoarial calcification; the peristome is 

 orbicular or rectangular; the frontal supports two vacuoles at least. The sulci 

 are scarcely visible on the dorsal and the vacuoles appear very small and arranged 

 in quincunx. The ovicell is very large and quite porous, spread over the median 

 crest and in six interfascicular spaces. 



Kx25 



L x25 



Mx25 



FIG. 2TS. Genus P&rascosoecia C.'inu, 1910. 



A-E. Parascoscecia (Petalopora) costata D'Orbigny, 1851. A. Surface of zoarium, enlarged. 

 B, C. Longitudinal and transverse section, magnified. (A-C. After Novak, 1877.) D. Longitudi- 

 nal thin section. (After Pocta.) E. View of zoarium, X 12, showing the ovicell pierced by the 

 tubes. 



F-H. Parascosoecia (Sparsicarea) carantina D'Orbigny, 1853. F, G. Specimens with ovi- 

 cells, X 10, from Cretaceous of England. H. Longitudinal section, X 14. (F-H. After Gregory, 

 1899.) 



I-L. Parascosoecia (Heteropora) coiisimilis Ulrich, 1SS2. I. Ovicelled specimen, X 12. 

 from the Mitlwayan at Mabelvale, Arkansas. J. K. M. Transverse, tangential, and longitudinal 

 thin sections, X 25. L. Vertical section, X 25. showing tubules of consolidation. 



