NORTH AMERICAN EARLY TERT1AR1' BRYOZOA. 197 



NELLIA BIFACIATA, new species. 



Plate 32, figs. 15-19. 



Description. The segments are formed of four linear series, with five zooecia 

 in each. The zooecia are distinct, constricted below, and provided with a much- 

 developed gymnocyst bearing two small avicularia. The mural rim is thin, salient, 

 and without cryptocyst. The opesium is somewhat oval, narrowest below; the 

 two frontal avicularia are symmetrical, simple, and without pivot. 



-., . Ao=0.26 mm. . (2=0.50 mm. 



Measurements. Opcsta , Zooecia, n -,,-, on 



/o=O.OS-0.10 mm. 1*3=0.16-0.20 mm. 



Affinities. The four faces of the zoarium are not identical. There are two 

 rows of broad zooecia and two narrower ones. This character primarily, in addi- 

 tion to the great development of the gymnocyst, clearly distinguishes this species 

 from Nellia oculata Busk, 1852. The micrometric measurements are also smaller. 



The specimens from the Jacksonian are a little smaller than those of the 

 Vicksburgian, but all the, other characters are absolutely similar. 



The first, of the lower zooecia of the segment is often radicular ; the second is 

 frequently regenerated. In figs. 15. 16 may be seen an ordinary zooecium trans- 

 formed into a radicular zooecium ; probably it contained no polypide. We have not 

 had the opportunity to discover the ovicells. 



Occurrence. Lower Jacksonian (Moodys marl) : Jackson, Mississippi (very 

 rare) . 



Middle Jacksonian (Castle Hayne limestone) : Wilmington, North Carolina 

 (rare). 



Vicksburgian (Glendon member of Marianna limestone) : West bank of Cone- 

 cuh River, 1 mile below mouth of Sepulga River, Conecuh County, Alabama (rare). 



Vicksburgian (Byram marl) : Byram, Mississippi (rare). 



Gotypes.G&i. Nos. 63954, 63955, TJ.S.N.M. 



NELLIA CONCATENATA Canu, 1907. 



Plate 32, figs. 20, 21. 



1907. Farc-imia coiicatenatti CANU, P>ryozonires cles terrains tertiaires des environs de Paris, 

 Annales de Paleontologie, vol. 2, p. 19, pi. 11, figs. 1-4. 



Of this species we have found only the two figured fragments which have been 

 compared directly with specimens from the vicinity of Paris, with the result that 

 their identity can not be doubted. 



The large dimensions of Nellia concafcnatu clearly distinguishes it from the 

 two preceding, Nellia ovulata Busk and A 7 , bifaciata. 



Occurrence. Middle. Jacksonian: One-half mile southeast of the Georgia 

 Kaolin Company's mine, Twiggs Count} 7 , Georgia (very rare). 



Plesiotypes.Cnt. No. 63956, U.S.N.M. 



NELLIA MIDWAYANICA. new species. 



Plato 4, figs. 10-15. 



Description. The zoarium is articulated and radicellate. Each segment is 

 quadrangular and formed of straight zooecia arranged in four series equal, two by 



