186 
BULLETIN .106, UNITED STATES NATIONAL MUSEUM. 
Occurrence. — Middle Jacksonian: Near Lenuds Ferry, South Carolina (very 
rare). 
Geological distribution. — Priabonian of Vicentin, Italy (Reuss, Waters), and 
jiossibly in the Rupelian of Gaas, France (Eeuss). 
Plesiotype. — Cat. No. 63952, U.S.N.M. 
SCRUPOCELLARIA COOKEI, new species. 
Plate 81, figs. 6-8. 
Description. — The segments of this new species carry at a maximum 10-12 
zooecia arranged alternately. The zooecia are distinct and elliptical; their mural 
rim is rounded, and bears a very small distal rounded avicularium, without a pivot ; 
the frontal avicularium is larger and elliptical. On the dorsal side the zooecia are 
distinct and convex; the vibraculum is almost straight, pointed, and bears a small 
groove and a small radicular pore. 
M easurements.- 
. \ho= 0.28 mm. 
-°P esl %=0.12 mm. 
Zooecia 
\Ls-0A2 mm. 
1/3=0.22-0.26 mm. 
Affinities. — This species is distinguished from ScrupoceTlaria elliptica Eeuss. 
1869, by its greater breadth and its straight vibraculum. From S. gracilis it 
differs in its greater micrometric dimensions, the constancy of the frontal avicu- 
larium and the larger vibraculum ; from S. milneri by its smaller dimensions and 
straighter and much smaller frontal avicularium. We have not found the pore 
or the pit indicating the presence of the scutum on any of the specimens, nor can we 
explain the meaning of the distal lamella observed in some opesia (fig. 6). 
This fine species is dedicated to Dr. C. Wythe Cooke, of the United States 
Geological Survey, to whose painstaking efforts through several field seasons we 
are indebted for much of our choicest material from the Jacksonian and Vicks- 
burgian of the Southern States. 
Occurrence. — Vicksburgian (Marianna limestone) : Salt Mountain, 5 miles 
south of Jackson, Alabama (common). 
Vicksburgian (Eed Bluff clay), 7-J miles southwest of Bladen Springs, Alabama 
(very rare). 
Vicksburgian (Byram marl) : Near 'Woodward, Wayne County, Mississippi 
(rare). 
Holotype. — Cat. No. 61237, U.S.N.M. 
SCRUPOCELLARIA MILNERI, new species. 
Plate 81, figs. 9-16. 
Description. — The segments in this species are large and bear at a maximum 
10-12 alternating zooecia. The zooecia distinct and elliptical; their mural rim 
rounded and bearing an inconspicuous distal avicularium, without pivot. The 
frontal avicularium is very large, oblique, acuminate, without pivot or denticle. On 
the dorsal the zooecia are a little convex; the vibraculum is oblique, rather large, 
and bears a quite distinct, prominent groove and a large radicular pore situated on a 
