84 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
GENERIC TABLE OF MEMBRANIPORAE. 
Section I. No ovicell. 
Genera represented. Family presumed. Genera unrepresented. Family presumed. 
Conopeum Norman, 1903. Discoflustrellaria D’Orbigny, 1S51. 
Memltraniporina Levinsen, 1909. Crepis Jullien, 1882. 
Adenifera Canu and Bassler, 1917. Heliodoma Calvet, 1907. 
Cupuladria, new genus. 
Acanthodesia, new genus. 
Trochopora D’Orbigny, 1S52. 
Otionella Canu and Bassler, 1917. 
Section II. Ovicell endozooecial. 
Himclcsina Norman, 1903, Flustridae (Norman). Setosellina Calvet, 1907. 
MembrcndoecAnm Canu and Bassler, 1917, Far- 
ciminariidae. 
Ogiralina Canu and Bassler, 1917, Onyeliocel- 
lidae. 
Vibracellina Canu and Bassler. 1917, Lunula- 
riidae. 
Section III. Ovicell hyperstomial, closed by the opercular valve. 
Periporosella Canu and Bassler, 1917, special Tremopora Ortrnan, 1S90, Bicellariidae (Levin- 
family. sen). 
Ellisina Norman, 1903. Larnacius Norman, 1903, special family. 
Grammella Canu, 1917. 
Membra niporidra Canu and Bassler, 1917. 
Section IV. Ovicell hyperstomial, not closed by the opercular valve. 
Alderina Norman, 1903. Ammataphora Norman, 1903. 
Callopora Gray, 1848. Mars anno para Lang, 1914. 
Tegella Levinsen, 1909. 
Amphiblestrum Gray, 1848. 
Ramplionotus Norman, 1894. 
SfamenoeeUa Canu and Bassler. 1917. Bicel- 
lariidae. 
Section V. Miscellaneous. 
Cauloramphus Norman, 1903. Foveolaria Busk, 18S3. 
Membrostega Jullien. 1903. 
Antropova Norman, 1903. 
The dorsal of some Membraniporae present certain thinning or thickening, as in 
Antropova gramdifera Norman (fig. 23). This phenomenon manifests itself on the 
fossils by little cavities or impressions. We have found them in Alderina nodulosa, 
new species (fig. 23). Their physiological significance is unknown. 
The dorsal of the Membraniporae also shows the dietellae visible by transpar- 
ency. On well-preserved fossils they can be best revealed by abrading the surface 
slightly. Beissel employed a quite complex but very instructive method of casting- 
in order to show these structures (fig. 23). 
