NORTH AMERICAN EARLY TERTIARY BRYOZOA. 247 



1-i, 20), and finally the normal zooecia are developed (figs. 7, 9, 10, 12). The zone 

 of small zooecia does not always develop (fig. 11), but fragments containing the 

 two sorts of zooecia are very common. 



The endozooecial ovicell is clearly apparent on the splendidly preserved speci- 

 men shown in figure 9. Generally it has the more voluminous aspect shown in 

 figures 7 and 10. 



In the interior the fragile partitions limit the radial rows of zooecia (fig. 15), 

 and the opesium and the cryptocyst have the same form. The zooecia have 

 no basal wall (fig. 16) ; the very oblique and much-developed distal wall has an 

 ovicell (ov., fig. 16). Certainly chitinous walls must have taken the place of 

 the usual calcareous walls here absent in order to limit the general cavity which 

 contains leucocytes, ovula, spermatozoa, and the polypide, and separates it from 

 the large partitioned zoarial cavity which can only contain sea water. 



The vibracula are as large as the zooecia ; they are present in all the interzooecial 

 angles, whereas in Lunularia vicksburg en-sis and in L. contigua there is in one row 

 only one vibraculum to two zooecia. 



The same large, partitioned zooecial cavity exists also in Lunularia contigua; 

 but the latter species has smaller zooecia and is provided with a complete basal 

 wall. 



Occurrence. Middle Jacksonian: Wilmington, North Carolina (common), 

 Lonsdale's type locality; near Lenuds Ferry, South Carolina (common); Eutaw 

 Springs, South Carolina (common) ; 18 miles west of Wrightsville, Georgia (com- 

 mon) ; 3i miles north of Grovania, Georgia (rare). 



Upper Jacksonian (Ocala limestone) : West bank of the Sepulga River. Es- 

 cambia County, Alabama (rare). 



Jacksonian (Zeuglodon zone) : Bluff south side of Suck Creek, Clarke County, 

 Mississippi (rare) ; Cocoa post office, Choctaw County, Alabama (rare). 



Vicksburgian (Marianna limestone) : One mile north of Monroeville, Alabama 

 (rare) ; west bank of Conecuh River, Escambia County, Alabama (rare). 



Pleslotypes.Q&i. Xos. 63997, 63998, U.S.N.M. 



LUNULARIA CONTIGUA Lonsdale, 1845. 



Plate 39, figs. 1-5. 



1845. Lunulites contigua LONSDALE, Account of twenty-six species of Polyparia obtained 

 from the Eocene Tertiary formations of North America, Quarterly Journal Geo- 

 logical Society of London, vol. 1, p. 533, fig. (not Ernmons 1858= L. di-stans Lons- 

 dale, 1845). 



Description. The zoarium is a large conical Lunulites in which the zooecia 

 and avicularia are disposed in distinct rows. The small zooecia are ogival, little 

 distinct, transverse. The cryptocyst is of little depth and is as long as the opesium; 

 the opesium is semilunar with a nearly straight proximal border. The large 

 zooecia have no cryptocyst. Each zooecium has the form of an isolated, closed 

 sac, situated in a large, partitioned zoarial cavity. The vibracula are long and 

 narrow, with two lateral, improminent condyle*. disposed in special rows, but with 



