Measurements.- 



714 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



It differs from Diastopora tubiformis in which the zoarium is almost identical, 

 in the absence of overlapping wrinkles on the tubes, and in the presence of a sep- 

 arating thread between the tubes. 



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

 North Carolina (rare). 



Cotypcs.Czt. No. 65275, U.S.N.M. 



PLAGIOECIA LAMELLOSA, new species. 



Plate 122, figs. 10-13. 



Description. The zoarium is unilamellar. The tubes are indistinct at their 

 base, cylindrical, rectilinear, striated, terminated by a very oblique peristomie, 

 arranged in quincunx; the peristome is orbicular and oblique or more often elliptical 

 and horizontal. The ovicell is convex, transverse, in the form of a crescent whose 

 convexity is proximal and not parallel to the zoarial margins. No zone of growth 

 is visible. 



Diameter of the peristome 0.12 mm. 



Distance between the peristome? 0.50 mm. 



Separation of the peristomes 0.58 mm. 



Affinities. The difference between this species and Diastopora striatisemota is 

 very slight; they perhaps represent the same species. The present species differs 

 from it in its larger zooecial diameter (0.12 and not 0.10 mm.) and chiefly in the 

 great separation of the peristomes (0.58 and not 0.40 mm.). This has the same 

 ovicell as Plagioecia botula, but it differs from it in its peristome of 0.12 and not 

 0.16 mm. More numerous specimens will permit us perhaps to reunite these three 

 species. 



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

 North Carolina (rare). 



Cotypes.C&t. No. 65429. U.S.N.M. 



PLAGIOECIA BOTULA, new species. 



Plate 124, figs. 1, 2. 



Description. The zoarium is discoidal, incrusting shells, and emits flabelliform 

 expansions. The tubes are distinct, long, cylindrical, or somewhat in the shape of 

 a horn, bent upward at their extremity, arranged in regular quincunx, slightly 

 striated, terminated by a short very oblique peristomie; the peristome is orbicular 

 or elliptical when the peristomie is incomplete. The ovicell is rectilinear, convex in 

 the form of a sausage. The zone of growth is invisible. 



(Diameter of the peristomes (when not salient) _ 0.12-0.16 mm. 



Measurements. {Distance between the peristomes 0.40-0.60 mm. 



|Separation of the peristomes 0.40-0. 50mm. 



