742 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
or clavate, striated transver sally, bent upward at their extremity and terminated 
by a more or less salient peristome; the peristome is orbicular and thick. The 
ovicell is large, transverse, globular, traversed by the tubes which conserve their 
reciprocal positions. 
Diameter of the peristome 0.10-0.12 mm. 
, r , Zooecial diameter 0.20 mm. 
Measurements . — ^ , , jn 
Distance between the onhces 0.40 mm. 
Separation of the peristomes__ . 0.40 mm. 
Measurements of [Diameter of the peristome 0.10 mm. 
S tomatoporoid Zooecial diameter 0.16 mm. 
portion. — [Distance between the orifices 0.50-0.60 mm. 
The micrometric measurements of this species are quite variable; those, which 
we give are quite approximative. 
Affinities. — The species is very remarkable in its zoarial aspect which appears 
more often like a palm leaf at the end of a long stem. In the old zoarial classifica- 
tion it would be impossible to give this species a generic name, since it affects suc- 
cessively the forms of Stomatopora , Proboscina , and Berenicea. This phenomenon 
has been noted, moreover, rather frequently in the literature, and a most con- 
vincing example was figured by Hineks as long ago as 1880 in Stomatopora 
johnstoni. 
Occurrence. — Middle Jacksonian (Castle Hayne limestone) : Wilmington, 
North Carolina (very rare). 
Holotype. — Cat. No. 65276, U.S.N.M. 
DIAPEROECIA JACKSONIENSIS, new species. 
Plate 121, figs. 12-13. 
Description . — The zoarium incrusts shells in claviform branches. The tubes 
are distinct, cylindrical, arranged in quincunx, finely punctate, with the peristomie 
salient, oblique, and elevated to 60° ; the peristome is orbicular, oblique. The 
ovicell is salient, globular, inclosing a dozen tubes; the oeciostome is elliptical, 
little salient, joined to a tube. 
[Diameter of the peristome 0.12 mm. 
Measurements . — Distance between the peristomes 0.60 mm. 
I Width of the zoarium 1.7 mm. 
The figured specimen is the only one that has been discovered. 
Occurrence. — Lower Jacksonian (Mooclys marl) : Jackson, Mississippi (very 
rare. ) 
Holotype. — Cat. No. 65302, U.S.N.M. 
DIAPEROECIA LOBULATA, new species. 
Plate 122, figs. 1-7. 
Description . — The zoarium is free and tubular or incrusts shells; it is formed 
of successive, flabellate lobules more or less symmetrically arranged on each side 
