736 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Some zooecia are closed by a calcareous septum. We know that the latter 

 is always placed at the base of the peristomie. Most certainly this species was 

 provided with tubes with long peristomies, as the elliptical form of the apertura 

 proves. 



Affinities. This species differs from Berenicea regularis D'Orbigny, 1852, of 

 the Cenomanian, and from Diastbpora siiborbieularis (Hincks, 1880), Canu, 1909, 

 of the. Lutetian in its wider peristome (0.14 and not 0.06-0.10 mm.), and in the 

 arrangement of its peristomes in false radial series. 



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

 North Carolina (rare). 



Ho7otype.--Ciit. No. 65324, U.S.N.M. 



MICROECIA VIBRIO, new species. 

 Plnte 128, figs. 14-18. 



Description. The zoarium creeps on algae or more often on Orbitoid 

 f oraminifera and shells ; it is orbicular or elliptical, almost always eccentric. The 

 tubes are indistinct at the center, distinct and serpentiform on the zoarial margins ; 

 arranged in quincunx; the peristome is elliptical or triangular, thin, salient, or 

 placed at the extremity of a short peristomie. The ovicell is globular and small. 

 The zone of growth is very little visible. 



Diameter of the peristome 0.08-0.10 mm. 



Distance of the peristomes 0.30-0.40 mm. 



Separation of the peristomes 0.26 mm. 



The central part of the large zoaria and the young zoaria do not have distinct 

 tubes; they are only visible in their peristomie more or less salient and elevated. 

 The serpentiform tubes are only visible on the completely developed zoaria; often 

 even the separating furrow disappears in fossilization. The presence of closed 

 zooecia indicates a more salient peristomie than that persisting on the fossils. 



Affinities. This species differs from Microecia hirta in the somewhat larger 

 diameter of the peristome (often more than 0.08 mm.) and in the form of its 

 zooecia. 



Occurrence. Upper Jacksonian (Ocala limestone) : Chipola River, east of 

 Marianna, Jackson County, Florida (rare) : below Plant System railroad wharf. 

 Bainbridge, Georgia (rare). 



Vkksburgian (Marianna limestone) : Salt Mountain, 5 miles south of Jackson. 

 Alabama. 



Cotypes.Cai. Nos. 65323, 65486, U.S.N.M. 



MICROECIA HIRTA, new species. 



Plate 157, figs. 5-8. 



Description. The zoarium is free, unilamellar, suborbicular. The tubes are 

 hardly distinct, bent up at their extremity and terminated by a long, very oblique 



Meosurem ents. 



