EARLY TERTIARY CHEILOSTOME BRYOZOA. 75 



SCHIZORTHOSECOS INTERSTITIA Lea, 1833. 



Plate 6, figs. 4, 5. 



1833. OrbitoUtes interstitia Lea, Contribution to Geologj% Philadelphia, p. 



191, pi. 6, fig. 204. 

 1862. Lunnlites interstitm Gabb and Horn, Monograph fossil Polyzoa 



Secondary and Tertiary formations North America, Journal Academy 



Natural Science, Philadelphia (2), vol. 5, p. 120. 

 1890. LunuUtes (Cupiilaria) interstitia De Gregoria, Monographie Fauna 



Eocenique de Alabama, Annal. de Geologic et du Paleontologie, pts. 



7, 8, p. 249, pi. 42, figs. 1&-22. 



Descr/pti'on. — The zoarium is ciipiiliform, little deep. The zocecia 

 are distinct, tubular, erect, terminated by a narrowed peristomie. 

 The apertura is placed at the base of the peristomie ; in its rimule, it 

 often has a flat lyrule; the peristomice is of the same form as the 

 apertura. Between the peristomes, on the external surface, there 

 are numerous zooeciules which are transformed according to their 

 position into radicular zooeciules, into avicularia with pivot, or into 

 compensation zooeciules. On the inner face each zooecium is indi- 

 cated by a hexagon perforated with 6 to 10 large tremopores, wdiich 

 are the orifices of long tubules; some large avicularia with pivot 

 surround the ancestrula. 



Occurrence. — Claibornian: Claiborne, Alabama (very common), 

 and many other localities. 



Lower Jacksonian: Jackson, Mississippi (very common). 



Type.— C^t. No. 62609, U.S.N.M. 



Genus ORBITULIPORA Stoliczka, 1862. 



1862. OrbituUpora Stoliczka, Oligocane Bryozoen von Latdorf in Bernburg, 

 Sitzimgsberichte der k. Akademie der Wissenschaften, Wien, vol. 4.5, 

 Abth.. p. 90. 

 The apertura is orbicular. The frontal is a tremocyst. The zoa- 

 rium is orbicular and formed of two lamellae with zocecia back to 

 back. 



Genotype — OrhituUpora {Cellepora) petiolus Lonsdale, 1850. 

 Range. — Auversian-Tortonian. 



Genus BATOPORA Reuss, 1847. 



1847. Batopora Reuss. Die fossilien Polypnrien des Wiener Tertiarbeckens, 

 Haidinger's naturwissenschaftliche, Abth. vol. 2, Wien, p. 78. 



The apertura is orbicular. The frontal is a granular olocyst. 

 The zoarium is conical, never hollow. The ancestrular zooecium is 

 ornamented with radicular pores. 



Genotype. — Batopora rosula Reuss, 1847. 



Range. — Lutecian-Tortonian. 



