NORTH AMEKICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 187 



We have made only the few following changes in this classification. First, 

 Conescharellina , provided with a peristomial ovicell, belongs to another family; 

 second, we add the American genus ScMzorthosecos as a valid genus in the first 

 group; third, we believe it best to separate the group Fedora from Mamillopora until 

 the type of the latter genus is better laiown. 



The hydrostatic function of the central "pit" noted by Waters is unknown. 

 On the inner side of ScJdzortJiosecos and of Mamillopora there are hydrostatic 

 cavities of different functions, for they are surmounted by ordinary but much 

 smaller zooecia and there are many of them to a zoarium. 



In this group the ancestrula engenders six zooecia and not five as in most other 

 bryozoans. As a result of the studies of Waters in 1919 we have modified some of 

 the generic diagnoses given in our monograph on the early Tertiary Bryozoa. The 

 reader will find studies on the Conescharellinidae in our forthcoming monograph of 

 the recent bryozoa from the Philippine Islands. 



Genus BATOPORA Reuss, 1867. 



1867. Batopora Reuss, Ueber einige Bryozoen aus dem deutschen Unteroligocan, SitzuDgsberichte 

 der K. Akademie der Wissenschaften, Wien, vol. 55, Abth. 1, p. 8. 



With a pit toward which the zooecia are directed. Oral aperture small (0.09 

 imn.), nearly round, but examination shows straight lower edge. Bilaminate. 

 Primary zooecia hidden (Waters) . The frontal is a granular olocyst. The zoarium 

 is conical, never hollow and formed of two superposed lamellae. 



Genotype. — Batopora stoliczkai Reuss 1867 (probably young of B. multiradiata 

 Reuss, 1869). Stampian, Tortonian. 



The known species of the genus are : 



Batopora rosnla Reuss, 1847. Tortonian. 



Batopora scroMculata Koschinski, 1885. Lutetian. 



Batopora conica Sequenza, 1880. Tongrian. 



Batopora stoliczkai Reuss, 1867. Priabonian. 



Batopora multiradiata Reuss, 1869. Priabonian. 



Genus ORBITULIPORA Sfoliczka, 186i. 



1861. Orbitulipora SxonczK.t, Oligocane Bryozoen von Latdorf in Bernberg, Sitzungsberichte 

 der k. Akademie der Wissenschaften, Wien, vol. 65, Abth. 1, p. 90. 



With a pit toward which the zooecia are directed. Oral aperture large, with 

 straight lower edge. Pit on the side bimultilayered (Waters). The frontal is a 

 tremocyst. The zoarium is orbicular and formed of two laj-ers placed back to back. 



Genotype. — Orhitulipora haidingeri Stoliczka, 1861. 



Range. — Bartonian, Tortonian. 



The other known species of this genus are: 



Orbitulipora (Cellepora) petiolus Lonsdale, 1850. Bartonian. 



Orhitulipora excentrica Sequenza, 1879. 



Orhitulipora leiUicidaris Reuss, 1869. Tongrian. 



