182 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



now referred elsewhere while EscTiarifora D'Orbigny, 1850, a descrip- 

 tion of which follows, is the only other known genus of the family. 



Genus ESCHARIFORA D'Orbigny, 1851 



1851. Escharifora D'Orbigny, Paleontologie francaise, Terrain Cretac6, Bryo- 

 zoaires, p. 208. 



G F 



Fig. 54. — Genus Levinsenella Harmer, 1926. (Columnaria Levinsen, 1909, 



preoccupied) 



A-C. Levinsenella brasiliensis Busk, 1884. A. Zoarium natural size. 

 B. Ordinary zooecia. C. OviceU. (A-C, after Busk, 1884.) 

 D-G. Levinsenella borealis Levinsen, 1909. D. Two zooecia with ovicells. 

 On each side of the ovicell in its dis.tal half is seen a cryptocyst plate, X17. 

 E. The membranous ectooecium and the triangular cryptocyst plate (ekto) of the 

 ovicell are seen, X17. F. The membranous parts of the zooecia have been 

 removed. The lateral walls and the distal wall (dw) with septulae in addition 

 to the cryptocyst plate of the ovicell (ekto) are seen, X23. G. Longitudinal 

 section through a zooeeium with ovicell. The membranous ektooecium, the 

 cryptocyst plate (ekto) of the ovicell and the membranous wall between the zooe- 

 eium and the ovicell (m. ov.) are seen, X23. (D-G. After Levinsen, 1909.) 



Coscinopleuridae in which the zooecia are surrounded by orbicular 

 avicularia and pores. 



Genotype.— Escharifora argus D'Orbigny, 1852. Cretaceous. 



As in the genus Coscinopleura, the ovicell is superfrontal and is 

 formed by the development of the distal portion of the mural rim. 



