692 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



ONCOUSOECIA QUINQUESSRIATA, new species. 



Plate 157, figs. 9-16. 



Descriptions. The zoarium has the Filisparsa growth, thin, bifurcated with 

 short branches; the dorsal is smooth and the tubes are there visible longitudinally. 

 The tubes are long, distinct, convex, arranged in five longitudinal rows, curved 

 upward into a long, very oblique peristomie; the peristome is thin and orbicular. 

 The ovicell is large, salient, pyriform, the point below, placed at the extremity of 

 a branch ; the oeciostome is elliptical, transverse, salient, of the same diameter as the 

 tubes. 



Diameter of the peristome 0.16 mm. 



Distance between the peristomes 0.80-1.00 mm. 



Separation of the salient tubes 0.90 mm. 



Separation of the nonsalient tubes 0.76 mm. 



Length of the peristomie 0.30 mm. 



Width of the branches-- - 0.50 mm. 



Measurements. 



Variations. The two series of lateral tubes open on the side and they are 

 sometimes even completely turned around so that they open in the plane of the 

 dorsal. 



The peristomies opening nearly at the same height form very irregular kinds 

 of verticells. On other branches, they are arranged in quincunx. 



Affinities. This species is very characteristic and very easy to determine. 

 Some branches are similar to Filisparsa bini, but the present species differs in the 

 presence of its five longitudinal rows of tubes and in the greater diameter of the 

 peristomes (0.16 and not 0.12 mm.). 



Occurrence. Vicksburgian (Marianna limestone) : One mile north of Monroe- 

 ville, Alabama (rare) ; west bank Conecuh River. Escambia County, Alabama 

 (rare). 



Vicksburgian (Byram marl) : Byram, Mississippi (common). 



Vicksburgian (Eed Bluff clay) : One-fourth mile west of Woodward, Wayne 

 County, Mississippi (very rare). 



Cotypes.C&t. Nos. 65400, 65401. U.S.N.M. 



PERISTOMOECIA, new genus. 



The peristomie alone is enlarged to form the ovicell. 



Genotype. Stomatopora divergens Waters, 1904. 



Range. Recent. 



Other species of this genus are : 



Proboscina lamourouxi Savigny-Audouin, 1826. 



Prdboscina boryi Savigny-Audouin, 1826. 



