NORTH AMERICAN 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 Schizorthosecos 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 known. 
The hydrostatic function of the central “pit” noted by Waters is unknown. 
On the inner side of Schizorthosecos 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. 
I 
1867. Batopora Reuss, Ueber einige Bryozoen aus dem deutschen Unteroligocan, Sitzungsberichte 
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 
mm.), 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 stoliczTcai Reuss 1867 (probably young of B. multiradiata 
Reuss, 1869). Stampian, Tortonian. 
The known species of the genus are: 
Batopora rosula Reuss, 1847. Tortonian. 
Batopora scrobiculata Koschinski, 1885. Lutetian. 
Batopora conica Sequenza, 1880. Tongrian. 
Batopora stoliczkai Reuss, 1867. Priabonian. 
Batopora multiradiata Reuss, 1869. Priabonian. 
Genus ORBITULIPORA Stoliczka, 1861. 
1861. Orbitulipora Stoliczka, 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 layers placed back to back. 
Genotype.—Orbitulipora haidingeri Stoliczka, 1861. 
Range. —Bartonian, Tortonian. 
The other known species of this genus are: 
Orbitulipora ( Cellepora ) petiolus Lonsdale, 1850. Bartonian. 
Orbitulipora excentrica Sequenza, 1879. 
Orbitulipora lenticularis Reuss, 1869. Tongrian. 
