152 PEOCEEDI]SrGS OP THE NATIONAL. MUSEUM VOL.72 



Geographic distribution. — Eastern Atlantic Gulf of Gascony: 

 (Waters); Madeira (Waters). Western Atlantic: Off Barra Grande, 

 Brazil, 658 meters (Busk). 



Plesiotypes.— Cat. No. 7566, U.S.N.M. 



Suborder Hexapogona Canu and Bassler, 1927 

 Family MAMILLOPORIDAE Canu and Bassler, 1927 



Following Waters, 1919, we have tried to place a little order in 

 the classification of the Batopora-Mamillopora group. After the 

 present studies on Mamillopora cupula and the studies that we have 

 made on Philippine species we can state that the limits given by 

 Waters to the genus Mamillopora are too great. In reality there are 

 several genera perfectly distinguished by their opercula as well as 

 their general structure. 



The known genera of this family are as follows : 



Mamillopora Smitt, 1873, Miocene — Recent. 



Fedora Jullien, 1882 — Recent. 



Anoteropora Canu and Bassler, 1927, Pliocene — Recent. 



Stenosipora Canu and Bassler, 1927, Eocene (Lutetian, Priabonian). 



Kionidella Koschinsky, 1885, Eocene (Lutetian) and Oligocene 

 (Vicksburgian) . 



Prattia D' Archiac, 1847, Eocene (Auversian). 



Ascosia Jullien, 1882 — Recent. 



Genus MAMILLOPORA Smitt, 1873 



1873. Mamillopora Smitt, Floridan Bryozoa. Kongl. Svenska Vetenskaps- 

 Akademiens Handlingar, vol. 11, p. 33. 



The zoarium is cupuliform or conical and floating. The two faces 

 are covered by mammillosities. The superior face contains only the 

 aperture and its wide peristome. The aperture is subelliptical with 

 two submedian cardelles. The peristome bears an elliptical or oval 

 avicularium. The ovicelled zooecia are much larger. 



Genotype. — Mamillopora cupula Smitt, 1873. 



Range. — Miocene (Burdigalian) — Recent. 



The other known species of the genus are as follows : 



Mamillopora (Gupularia) hidenta Reuss, 1869 (according to 

 Waters), Eocene (Priabonian). 



Mamillopora tuberosa Canu and Bassler, 1919, Miocene (Bowden). 



Mamillopora cavernulosa, new name { = M. tuberosa Canu and 

 Bassler, part), Miocene (Costa Rica). 



MAMILLOPORA TUBEROSA Canu and Bassler, 1919 



1919. Stichoporina tuberosa Cantj and Bassler, Geology and Paleontology 

 of the West Indies Bryozoa. Publication Carnegie Institution; 

 Washington, No. 291, p. 98, pi. 7, figs. 1-8 (not plates 1 and 6 = 

 Mamillopora cavernulosa and M. cupula). 



