130 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Upper Jacksonian (Ocala limestone) : 1 miles above Bainbridge, Georgia 

 (very rare). 



Geological distribution. Miocene of Australia (MacGillivray) and Patagonian 

 of Argentina (Canu). 



Plesiotype.Cnt. No. 63895, U.S.N.M. 



Genus GRAMMELLA Canu, 1917. 



1917. Grammella CANU, Bulletin Soeiete Geologique de France, ser. 4, vol. 16, p. 131. 



The operculum closes the ovicell. The avicularium is interzooecial, large, with a 

 solid pivpt ; its form recalls that of the Greek letter . No dietellae. 

 Genotype. Membranipora crassimarginata, Hincks, 1880. 

 Range.- Santonian-Eecent. 



C X 1 



FIG. 32. Genus Grammella Canu, 1917. 



A-C. Grammella crassimarginata Hincks. 1880. A. Zooecia and avicularia. magnified. 

 (After Hincks, 1880.) B. Several zooecia with ovicell, X 25. (After Waters, 1898.) C. View 

 of the variety japonica Ortmann, 1890, X 15. (After Ortmann, 1890.) 



The living species of this genus are as follows : 



Grammella (Membranipora) crassimarginata Hincks, 1880. 



Grammella (Membranipora) cras8imargi.na.ta japonica Ortmann. 1890. 



Grammella (Membranipora) papulifera MacGillivray, 1885. 



Grammella (Membranipora) sculptn cucitllata Waters, 1898. 



The fossil forms are: 



Grammella (Membranipora) sculpta MacGillivray, 1894. 



Grammella (Eschara) lesueuri Hagenow, 1851. 



Grammella (Flustrella) confusa D'Orbigny, 1852. 



Grammella (Biflustra) mec/apora D'Orbigny, 1852. 



This is the Membranipora crassimarginata group of Waters which he defines as 

 follows: "Ovicell umbonate. with partial rib; avicularia vicarious." He did not 

 indicate the presence of dietellae. but he calls attention to one distal and two 

 lateral septulae. 



Waters introduced with doubt into this group (No. 11) the Membranipora 

 valdemunita Hincks, 1885, which Canu in 1900 made the type of his artificial sub- 



