NORTH AMERICAN EARLY TERTIARY BRYOZOA. 661 



PROBOSCINA GEMINATA, new species. 



Plate 120, figs. 1-3. 



Description. The zoarium is biserial, and incrusts cyclostomatous bryozoa. The 

 tubes are cylindrical, rarely distinct, arranged alternately, striated transversally. 

 The peristome is round, horizontal, little oblique, very thick ; the "peristomie is very 

 long, scarcely oblique. In the short branches, the tubes are not alternated ; the per- 

 istomes are at the same height and appear geminate, but this phenomenon is rather 

 rare. 



Maximum width of zoarium 0.48 mm. 



Diameter of tube 0.24 mm. 



Measurements. Length of tube 1.00-1.40 mm. 



Diameter of peristome 0.20 mm. 



Length of peristomie , 0.24-0.30 mm. 



Affinities. This large species is quite close to Proboscina projecta, but differs 

 from it in its peristome of smaller diameter (0.20 mm. instead of 0.24 mm.) and its 

 peristomie a little shorter and much more erect. 



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



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

 (rare). 



Cotypcs.C&t. No. 65278, U.S.N.M. 



PROBOSCINA ANCEPS, new species. 



Plate 120, figs. 4, 0. 



Description. The zoarium is biserial and incrusts shells emitting sublinear 

 branches. The tubes are indistinct, geminate, striated transversely. The peristome 

 is orbicular, thick, little salient, irregularly fringed. The branches are often uni- 

 serial. This species is provided with the largest peristome of all the American 

 species. 



Maximum width of zoarium 0.40 mm. 



Length of tube 1.40 mm. 



Diameter of peristome 0.30-0.34 mm. 



Occurrence. Middle Jacksonian (Castle Hayne limestone) : Wilmington, 

 North Carolina (rare). 



Cotypes.C&t- No- 65279, U.S.N.M. 



PROBOSCINA EXPATIATA, new species. 

 Plate 120, figs. 9, 10. 



Description. The zoarium is biserial and incrusts shells emitting wide branches 

 which are not all dichotomous. The tubes are very wide, little convex, depressed, 

 irregular, as if expanded, short. The peristome is thick, orbicular, or elliptical, 

 very little salient. 



Measurements- 



