348 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
M easurements. — Aperture 
ha= 0.125-0. 15 mm. 
la= 0.15-0.20 mm. 
Zooecia 
Lz= 0.65-0.72 mm. 
lz— 0.50 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 polvpide. 
The species appears to have some dietellae, variable in number (fig. 19). ■ 
Affinities. — This species differs from Arthropoma (Lepralia) speyeri 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 peristome. 
It differs from Lacerna (Schizoporella) 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. 
1S88. 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 ( Schizoporella ) ridleyi MacGillivray, 1882. 
Range. — Senonian-Recent. 
The recent species of this genus are according to Waters : 
Buffonella ( Schizoporella ) ridleyi MacGillivray, 1882. 
