NORTH AMERICAN EARLY TERTIARY BRYOZOA. 521 



Occurrence. Upper Jacksonian (Ocala limestone) : Chipola River, east of 

 Marianna, Jackson County, Florida (rare). 

 CotypesCai. No. 64169, U.S.N.M. 



Genus GEPHYROPHORA Busk, 1884. 



1SS4. Gephyrophora BUSK, Keport cm the Polyzoa collected by H. M. S. Challenger, pt. 1, 

 p. 67. 



The apertura bears a proximal rimule. The frontal is a tremocyst. 



Genotype. Gephyrophora polymorpha Busk, 1884. 



Range. Tongrian Recent. 



The known species of this genus are : 



Gephyrophora polymorpha Busk, 1884. Recent. 



Gephyrophora (Hippothoa) fenestrata Smitt, 1872. Recent (Florida). 



Gephyrophora (Schisoporella) biturrita Hincks, 1884. Recent. 



Gephyrophora (Eschara) tuberosa Reuss, 1865. Rupelian. 



Gephyrophora (Schiz&porella) tuberosa, var. angustata, Waters, 1887. Mio- 

 cene. 



Levinsen thought that the ovicell was endozooecial. If this observation be 

 confirmed the genus must be removed from this family. 



Genus TESSARADOMA Norman, 1868. 



1868. Tessaradoma NORMAN, Report 3Sth Meeting British Association Advancement of 

 Science, p. 309. 



The apertura is provided with cardelles. The frontal is surrounded by areolae 

 and covered by a pleurocyst. The spiramen opens at the level of the operculum. 

 The operculum in opening closes the spiramen. 



Genotype. Tessaradoma (PustuJopora) gracile Sars, 1850. 



Range. Jacksonian Recent. 



In spite of Jullien's observations, the exact nature of the spiramen is still 

 doubtful ; its place and its function are not yet elucidated. 



TESSARADOMA ORNATA, new species. 



Plate 67, fig. 1. 



Description. The zoarium is free, compressed, formed of three longitudinal 

 rows of zooecia and on one side only ; the dorsal is a tremocyst with sulci and gar- 

 nished with a row of salient avicularia with semicircular mandible. The zooecia 

 are distinct, elongated, gibbose ; the frontal is convex, smooth, surrounded by areolae 

 and ornamented with one or two simple, salient avicularia. The peristome is 

 salient and bears two small lateral avicularia; the peristomice is orbicular; the 

 peristomie is visible exteriorly, long and very oblique. The spiramen is a large pore 

 placed quite distant from the peristomice. 



JAe=0.09mm. . [3=0.60-0.75 mm. 



Measurements. Peristomice , Zooecia^ , 



[]pe=0.09 mm. 1/2 = 0.25 mm. 



