NORTH AMERICAN EARLY TERTIARY BRYOZOA. 655 



STOMATOPORA CONTRACTA, new species. 



PlMte 105, figs. 1, 2. 



Description. The zoarium creeps over shells (T ere/bra tula) forming irregular 

 polygons; the dichotomization occurs almost at right angles. The tubes are oval, 

 contracted at their extremity, finely striated transversely. The peristome is orbic- 

 ular, thick, little salient. 



Diameter of tube 0.36 mm. 



Measurements. Length of tube 0.50-0.60 mm. 



Length of peristomie 0.16 mm. 



In the specimen shown in our figure, three tubes appear to have undergone 

 total regeneration. 



Occurrence. Midwayan (Clayton limestone) : Well at Brundidge, Alabama 

 (very rare). 



Eolotype. Cat. No. 65249, U.S.N.M. 



STOMATOPORA EXIGUA, new species. 



Plate 107, fig. 26. 



Description. The zoarium incrusts shells. The tubes are fusiform, narrow, 

 striated trausversally. The peristome is thin, oblique, round, or ellipticaJ ; the peris- 

 tomie is very oblique. 



I Diameter of tube 0.20 mm. 



Length of tube__ _ 0.56 mm. 



Measurements. \ . ,. . 



Diameter ot peristome 0.12 mm. 



( Length of peristomie 0.16 mm. 



Occurrence. Midwayan (Clayton limestone) : Well at Brundidge, Alabama 

 (very rare). 



Holotype.C&t. No. 65248, U.S.N.M. 



STOMATOPORA PARVIPORA, new species. 



Plate 131, figs. S, 9. 



Description. The zoarium incrusts oysters and other shells. The tubes are 

 cylindrical, very small, striated transversally ; the protoecium is orbicular. The 

 peristome is thin, salient, oblique, round, or elliptical; the peristomie is short. 



Diameter of tube _ 0.14-0.18 mm. 



Measurements. 



Length of tube _ 0.40-0.50 



mm 



Diameter of peristome 0.12-0.14 mm. 



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

 rare). 



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

 (rare). 



Vicksburgian ("Chimney rock" member of Marianna limestone): One mile 

 north of Monroeville, Alabama (very rare). 



Cotypes. Cat. Nos. 65361, 65362, U.S.N.M. 



