348 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



fA<z=0.125-0.15mm. . (Lz=0.6 



Measurements. Aperture -L .,., __ /ooecuu , . , 



[ la= 0.1 5-0.20 mm. \ls0.5( 



fAa=0.125-0.15mm. . f Ls=0.65-0.72 mm. 



'.50 mm. 



Variations. The calcification is here rather remarkable and more visible than 

 in Lacerna jacksonensis. The frontal is an olocyst, entire and smooth (fig. 17) ; 

 on the young zooecia; the pleurocyst develops at first over the areolae (fig. 18), 

 then spreads over all the zooecia (fig. 20). As Usual, the pleurocyst is irregularly 

 granulated, quite variable in its texture and its deposits. 



The calcification of the ovicell is absolutely identical. Originally the latter 

 'was formed by a thin olocyst thickened on its border into a circular crown; the 

 frontal callosity is surrounded by very small areolae (fig. 17) and may be covered 

 by a granular pleurocyst (fig. 20). On the young zooecia the operculum may 

 never close the ovicell (fig. 17), but on the much calcified zooecia the operculum in 

 opening may close the ovicell (fig. 20). Figure 20 presents a remarkable zooecium; 

 for in the total regeneration an avicularium replaces a normal polypide. 



The species appears to have some dietellae, variable in number (fig. 19). 



Affinities. This species differs from Arthropoma (Lepralia) speyerl 'Reuss, 

 1864, in which the aperture is identical in its nonporous frontal and its larger 

 avicularium. 



It differs from Lacerna jacksonensis in its larger micrometric dimensions and 

 its oval and nonfestooned pcristome. 



It differs from Lacerna (Schisoporella) nitens MacGillivray, 1895, in its deeper 

 rimule and in the point of the avicularium turned toward the bottom and not 

 toward the top. 



Occurrence. Vicksburgian (Marianna limestone) : Salt Mountain, 5 miles 

 south of Jackson, Alabama (rare) ; west bank of Conecuh River, Escambia County, 

 Alabama (rare) ; near Claiborne, Monroe County, Alabama (rare) ; Murder Creek, 

 east of Castlebury, Conecuh County, Alabama (rare) ; 1 mile north of Monroe- 

 ville, Alabama (rare). 



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

 Florida. 



Cotypes. Cat. Nos. 64048, 64049, U.S.N.M. 



Genus BUFFONELLA Jullien, 1888. 

 1SS8. Buffonella JULLIEN, Mission scientifique du Cap Horn, vol. 6, Zoologie, p. 47. 



The operculum in opening closes the ovicell. The aperture is semilunar: its 

 proximal border is straight and bears a rimule at its middle. The frontal and 

 ovicell are absolutely smooth. The operculum has a wide sinus and two muscular 

 points distant from the border. In front of the aperture there is often a small 

 avicularian chamber. 



Genotype. Buffonella (Schisoporella) ridleyi MacGillivray, 1882. 



Range. Senonian-Recent. 



The recent species of this genus are according to Waters : 



Buffonella (Schizoporella} ricUeyi MacGillivray, 1882. 



